How to buy a car Essay Example | Topics and Well Written Essays - 500 words - 1

How to buy a car - Essay Example Estimate a figure for yourself, with a range of the lowest and highest amount you, are prepared to pay for the car. Under no conditions should you go out of this range as it will ensure you do not spend more than you can afford. The next step in purchasing a car is to research online for car dealers near your locality that sell the type of car you want. Searching for dealers near you is advisable as it eases the purchasing process at a later time. Once you have identified dealers near you that have the car that you need, contact them through the internet or by phone and request for full details about the car including the quotation. Thoroughly go through the car details to ensure it has all the features you want. The fourth step entails doing further research on the price and characteristics of the car. You can go to the manufacture’s website to determine if the dealers are authorized dealers. Authorized dealers tend to give better discounts and also give promotional products as compared to dealers who might be brokers. You must carry out further research on the prices of the car type that you want and compare its features with that of other manufacturers to determine it is of the right worth. At this stage, you must have a range for the actual car price. Once you have determined the lowest price that you can get for the car, bargain with the dealers to ensure that you get a good price. You must not fear to bargain. You can go up to the level of pitting two dealers together by sending them low quotations from other dealers. At this stage eliminate some dealers who are rather uncooperative or have high price quotations, and single out at most three dealers who you will bargain  with later. Once you get the best prices from the dealers move to the next step The sixth step is where you bargain for tradeoffs and financing with the dealers. Ask for best prices for your trade and do some online research to determine

Spirituality 4 Essay Example | Topics and Well Written Essays - 1250 words

Spirituality 4 - Essay Example Although compassionate care giving stands out as an accepted social responsibility of the nurses, the practice defies professional ethics and requirements for health workers. This essay explores compassion fatigue form a processional and ethical perspective. Nurses and other caregivers often find themselves in a dilemma concerning the care they need to give to patients and their own welfare. Although health workers have a good understanding on the nature of human body its needs for rest and healthy lifestyles, they are bound by social and professional responsibilities (Joinson, 2007). Such responsibilities force them to neglect their personal needs. Although compassion fatigue is a major problem among health workers, most health professionals overlook the problem. According to Kottler (2005), the main reason why nurses overlook compassion fatigue is that they have become used to the problem making them to compromise with the fatigue. An interview conducted on nurses working in California hospital established that most nurses used medication to make them stay awake for long hours. The survey also established that most nurses had irregular sleeping periods due to workload or a desire to offer compassion services for their patients. This indicates that health workers need to have a concrete background on compassion fatigue symptoms. Compassion fatigue symptoms are identical to those of posttraumatic stress. Unlike posttraumatic stress, compassion fatigue symptoms are based on trauma. This indicates that they have a direct impact on the patient’s life and that the impacts can be demonstrated readily by their performance and behavior (Kottler, 2005). The basic concepts of compassion fatigue are emotional, cognitive, spiritual somatic and behavior. These concepts translate into symptoms and warning signs that characterize the condition. Standard

How to buy a car Essay Example | Topics and Well Written Essays - 500 words - 1

How to buy a car - Essay Example Estimate a figure for yourself, with a range of the lowest and highest amount you, are prepared to pay for the car. Under no conditions should you go out of this range as it will ensure you do not spend more than you can afford. The next step in purchasing a car is to research online for car dealers near your locality that sell the type of car you want. Searching for dealers near you is advisable as it eases the purchasing process at a later time. Once you have identified dealers near you that have the car that you need, contact them through the internet or by phone and request for full details about the car including the quotation. Thoroughly go through the car details to ensure it has all the features you want. The fourth step entails doing further research on the price and characteristics of the car. You can go to the manufacture’s website to determine if the dealers are authorized dealers. Authorized dealers tend to give better discounts and also give promotional products as compared to dealers who might be brokers. You must carry out further research on the prices of the car type that you want and compare its features with that of other manufacturers to determine it is of the right worth. At this stage, you must have a range for the actual car price. Once you have determined the lowest price that you can get for the car, bargain with the dealers to ensure that you get a good price. You must not fear to bargain. You can go up to the level of pitting two dealers together by sending them low quotations from other dealers. At this stage eliminate some dealers who are rather uncooperative or have high price quotations, and single out at most three dealers who you will bargain  with later. Once you get the best prices from the dealers move to the next step The sixth step is where you bargain for tradeoffs and financing with the dealers. Ask for best prices for your trade and do some online research to determine

The car crash Essay Example for Free

The car crash Essay Joni woke remembering that she still needed to get out of the car her last thought before shed fell unconscious, even though the bright lights stung her eyes her headache worse than before. She pushed her self up onto her elbows, groaning quietly at the pain that suddenly shot down her arm in response to this movement, though she couldnt tell whether they were cut or bruised. Trying to open her eyes Joni squinted at the bright strip lights directly above her. A strong antiseptic smell filled her nostrils causing a nauseous feeling to wash over her. A noise that sounded as though it was coming from far in the distance was beeping in a steady rhythm, sounded amplified against the otherwise still silence. Trying to look round the room Jonis eyesight, which was not yet adjusted to the bright light, saw that her surroundings consisted of mainly white. The dark shape of a man sitting by Jonis bed stood out against the whiteness of the room. The man wore casual clothes so he couldnt have been a doctor or nurse, and yet Joni didnt know who this man was or why he was visiting her. Ssshh, lie back down you need your rest now an unfamiliar voice told her, standing up from where he was sitting he looked tall leaning over Jonis bed. But she tried to answer being interrupted not only by the constant throbbing of her head but also the man continuing to speak. Deciding that lying down was a good suggestion Joni did as the man had told her, but was still fighting to keep her usually clear blue eyes open which felt red and sore. Im really sorry there was nothing that I could do, you drove straight into me before swerving off the edge of the road. I just wanted to stay with you at least until your family or someone came, so that you wouldnt be alone when you woke. The man told Joni in a low but concerned tone of voice. Joni relaxed realising that she was now safe in one of the hospital beds not too far from home. She recalled what had happened that had made her end up here. Jonis vision had blurred at the bright headlights approaching from the car  heading towards her. Outside the increasing rain splattered heavily on the roof of Jonis car to the same rhythm of her thumping head. It was only 11.30 when Joni had decided to leave the party early, feeling yet another headache coming on, the one that she was now suffering from. Joni hadnt had anything to drink, partly as she had wanted to drive home but also as she had been topped up with paracetamol for the past few weeks miserably trying to fight of the constant headaches though theyd had little affect. It was mid November; the wipers on Jonis old car, which her Dad had bought her only the year before to make do with until she could afford her own was having difficulty keeping the windscreen, clear of the heavy rain. The car ahead was getting closer and the lights getting brighter, it must now have been about 12.00, as Joni was driving down the sandy cliff edge road about 10 minuets from home. The road had been cut out of the dusty hillside in which Joni lived. The road itself was little more than a dusty track, turning quickly into mud as the rain beat down. One side of the road exceptionally dark with trees thickening into woodland the other a steep drop eventually ending in the distance with another small village embedded amongst the hills which could only be seen due to its thousands of glittering lights. The road didnt have any lights of its own Jonis own car lights and the lights from the car ahead were the only thing illuminating the dark road. Jonis eyes stung transfixed on the road ahead, her head still pounding somewhat worse than they were earlier and then Joni could remember nothing for what could have barely been a minuet. I must have blacked out she told the man in some sort of an explanation. The next thing that she could remember was colliding with the car that had been approaching, in her dazed state of mind Joni then tried to control the car from falling off the edge of the cliff. She felt the tumbling weight of the car, with her in it feeling like a metal ball inside a pinball machine,  only she was being thrown around inside the car. Then silence as the car suddenly sat still knowing that this could only mean that she had finally reached the bottom of the cliff she tried to host herself from the wreckage feeling a warm liquid trickling down her face which could only be blood she fell unconscious. I pulled you from the car as soon as I got down to the bottom of the cliff, it was a pretty steep climb, then called for an ambulance, I didnt think that you was still alive The man explained. Thank you Joni replied, looking at him for the first time noticing that he could be no more than 18. He had dark eyes brown or grey with longish dark which was ruffled and matted with mud and dry blood probably mine Joni thought, his face full of small cuts and bruises defined his boyish features. He shrugged shyly smiling It was nothing

History Of The Virtual Private Network

History Of The Virtual Private Network A VPN supplies virtual network connectivity over a possibly long physical distance. The key feature of a VPN, however, is its ability to use public networks like the Internet rather than rely on private leased lines which consume valuable recourse and extra cost . VPN technologies implement restricted-access networks that utilize the same cabling and routers as a public network, and they do so without sacrificing features or basic security , a simple cooperation office and remote branched VPN shown in below diagram . Sonicwall_Vpn A VPN supports at least three different modes of use as shown above: Remote access client connections. LAN-to-LAN internetworking . Controlled access within an intranet . A several network protocols have become popular as a result of VPN developments state as following : PPTP L2TP IPsec These protocols emphasize authentication and encryption in VPNs. Authentication allows VPN clients and servers to correctly establish the identity of people on the network. Encryption allows potentially sensitive data to be hidden from the general public. Many vendors have developed VPN hardware and/or software products. Unfortunately, immature VPN standards mean that some of these products remain incompatible with each other till now. Virtual private networks have grown in popularity as businesses to save money on remote network access for employees. Many corporations have also adopted VPNs as a security solution for private Wi-Fi wireless networks. Expect a continued gradual expansion in use of VPN technology to continue in the coming years. Objectives:- A virtual private network can resolve many of the issues associated with todays private networks. Cost: The cost of such links is high especially when they involve international locations. Even when VPNs are implemented on a provider private network, it would still be less expensive. Mobility of workforce: Many companies are encouraging telecommunications to reduce their investment in real estate, reduce traffic, and reduce pollution from automobile E-commerce applications: However, in traditional private networks, this kind of special access provision is difficult to incorporate because it is not easy to install dedicated link to all suppliers and business partners, nor it is flexible because a change in the supplier would require de-installing the link and installing another one to the new vendor. Advantages of VPN VPNs promise two main advantages over competing approaches cost savings, and scalability (that is really just a different form of cost savings). The Low Cost of a VPN One way a VPN lowers costs is by eliminating the need for expensive long-distance leased lines. With VPNs, an organization needs only a relatively short dedicated connection to the service provider. This connection could be a local leased line (much less expensive than a long-distance one), or it could be a local broadband connection such as DSL service. Another way VPNs reduce costs is by lessening the need for long-distance telephone charges for remote access. Recall that to provide remote access service, VPN clients need only call into the nearest service providers access point. In some cases this may require a long distance call, but in many cases a local call will suffice. A third, more subtle way that VPNs may lower costs is through offloading of the support burden. With VPNs, the service provider rather than the organization must support dial-up access for example. Service providers can in theory charge much less for their support than it costs a company internally because the public providers cost is shared amongst potentially thousands of customers. Scalability and VPNs The cost to an organization of traditional leased lines may be reasonable at first but can increase exponentially as the organization grows. A company with two branch offices, for example, can deploy just one dedicated line to connect the two locations. If a third branch office needs to come online, just two additional lines will be required to directly connect that location to the other two. However, as an organization grows and more companies must be added to the network, the number of leased lines required increases dramatically. Four branch offices require six lines for full connectivity, five offices require ten lines, and so on. Mathematicans call this phenomenon a combinatorial explosion, and in a traditional WAN this explosion limits the flexibility for growth. VPNs that utilize the Internet avoid this problem by simply tapping into the geographically-distributed access already available. Disadvantages of VPNs With the hype that has surrounded VPNs historically, the potential pitfalls or weak spots in the VPN model can be easy to forget. These four concerns with VPN solutions are often raised. 1. VPNs require an in-depth understanding of public network security issues and proper deployment of precautions. 2. The availability and performance of an organizations wide-area VPN (over the Internet in particular) depends on factors largely outside of their control. 3. VPN technologies from different vendors may not work well together due to immature standards. 4. VPNs need to accomodate protocols other than IP and existing internal network technology. Generally speaking, these four factors comprise the hidden costs of a VPN solution. Whereas VPN advocates tout cost savings as the primary advantage of this technology, detractors cite hidden costs as the primary disadvantage of VPNs INTERNET VPNS FOR REMOTE ACCESS In recent years, many organizations have increased the mobility of their workers by allowing more employees to telecommute. Employees also continue to travel and face a growing need to stay connected to their company networks. A VPN can be set up to support remote, protected access to the corporate home offices over the Internet. An Internet VPN solution uses a client/server design works as follows: 1. A remote host (client) wanting to log into the company network first connects to any public Internet Service Provider (ISP). 2. Next, the host initiates a VPN connection to the company VPN server. This connection is made via a VPN client installed on the remote host. 3. Once the connection has been established, the remote client can communicate with the internal company systems over the Internet just as if it were a local host. Before VPNs, remote workers accessed company networks over private leased lines or through dialup remote access servers. While VPN clients and servers careful require installation of hardware and software, an Internet VPN is a superior solution in many situations. VPNS FOR INTERNETWORKING Besides using virtual private networks for remote access, a VPN can also bridge two networks together. In this mode of operation, an entire remote network (rather than just a single remote client) can join to a different company network to form an extended intranet. This solution uses a VPN server to VPN server connection. Through the use of dedicated equipment and large-scale encryption, a company can connect multiple fixed sites over a public network such as the Internet. Site-to-site VPNs can be one of two types: Intranet-based If a company has one or more remote locations that they wish to join in a single private network, they can create an intranet VPN to connect LAN to LAN. Extranet-based When a company has a close relationship with another company (for example, a partner, supplier or customer), they can build an extranet VPN that connects LAN to LAN, and that allows all of the various companies to work in a shared environment. vpn-type INTRANET / LOCAL NETWORK VPNS Internal networks may also utilize VPN technology to implement controlled access to individual subnets within a private network. In this mode of operation, VPN clients connect to a VPN server that acts as the network gateway. This type of VPN use does not involve an Internet Service Provider (ISP) or public network cabling. However, it allows the security benefits of VPN to be deployed inside an organization. This approach has become especially popular as a way for businesses to protect their WiFi local networks. TUNNELING: SITE-TO-SITE In a site-to-site VPN, GRE (generic routing encapsulation) is normally the encapsulating protocol that provides the framework for how to package the passenger protocol for transport over the carrier protocol, which is typically IP-based. This includes information on what type of packet you are encapsulating and information about the connection between the client and server. Instead of GRE, IPSec in tunnel mode is sometimes used as the encapsulating protocol. IPSec works well on both remote-access and site-to-site VPNs. IPSec must be supported at both tunnel interfaces to use. TUNNELING Most VPNs rely on tunneling to create a private network that reaches across the Internet. Essentially, tunneling is the process of placing an entire packet within another packet and sending it over a network. The protocol of the outer packet is understood by the network and both points, called tunnel interfaces, where the packet enters and exits the network. Tunneling requires three different protocols: Carrier protocol The protocol used by the network that the information is traveling over Encapsulating protocol The protocol (GRE, IPSec, L2F, PPTP, L2TP) that is wrapped around the original data Passenger protocol The original data (IPX, NetBeui, IP) being carried Tunneling has amazing implications for VPNs. For example, you can place a packet that uses a protocol not supported on the Internet (such as NetBeui) inside an IP packet and send it safely over the Internet. Or you could put a packet that uses a private (non-routable) IP address inside a packet that uses a globally unique IP address to extend a private network over the Internet. COST SAVINGS WITH A VPN A VPN can save an organization money in several situations: Eliminating the need for expensive long-distance leased lines Reducing long-distance telephone charges Offloading support costs VPNS VS LEASED LINES Organizations historically needed to rent network capacity such as T1 lines to achieve full, secured connectivity between their office locations. With a VPN, you use public network infrastructure including the Internet to make these connections and tap into that virtual network through much cheaper local leased lines or even just broadband connections to a nearby Internet Service Provider (ISP). LONG DISTANCE PHONE CHARGES A VPN also can replace remote access servers and long-distance dialup network connections commonly used in the past by business travelers needing to access to their company intranet. For example, with an Internet VPN, clients need only connect to the nearest service providers access point that is usually local. SUPPORT COSTS With VPNs, the cost of maintaining servers tends to be less than other approaches because organizations can outsource the needed support from professional third-party service providers. These provides enjoy a much lower cost structure through economy of scale by servicing many business clients. VPN NETWORK SCALABILITY The cost to an organization of building a dedicated private network may be reasonable at first but increases exponentially as the organization grows. A company with two branch offices, for example, can deploy just one dedicated line to connect the two locations, but 4 branch offices require 6 lines to directly connect them to each other, 6 branch offices need 15 lines, and so on. Internet based VPNs avoid this scalability problem by simply tapping into the public lines and network capability readily available. Particularly for remote and international locations, an Internet VPN offers superior reach and quality of service. USING A VPN To use a VPN, each client must possess the appropriate networking software or hardware support on their local network and computers. When set up properly, VPN solutions are easy to use and sometimes can be made to work automatically as part of network sign on. VPN technology also works well with WiFi local area networking. Some organizations use VPNs to secure wireless connections to their local access points when working inside the office. These solutions provide strong protection without affecting performance excessively. VPN SECURITY: IPSEC Internet Protocol Security Protocol (IPSec) provides enhanced security features such as better encryption algorithms and more comprehensive authentication. vpn-diagram2 Photo courtesy Cisco Systems, Inc. A remote-access VPN utilizing IPSec IPSec has two encryption modes: tunnel and transport. Tunnel encrypts the header and the payload of each packet while transport only encrypts the payload. Only systems that are IPSec compliant can take advantage of this protocol. Also, all devices must use a common key and the firewalls of each network must have very similar security policies set up. IPSec can encrypt data between various devices, such as: Router to router Firewall to router PC to router PC to server LIMITATIONS OF A VPN Despite their popularity, VPNs are not perfect and limitations exist as is true for any technology. Organizations should consider issues like the below when deploying and using virtual private networks in their operations: VPNs require detailed understanding of network security issues and careful installation / configuration to ensure sufficient protection on a public network like the Internet. The reliability and performance of an Internet-based VPN is not under an organizations direct control. Instead, the solution relies on an ISP and their quality of service. Historically, VPN products and solutions from different vendors have not always been compatible due to issues with VPN technology standards. Attempting to mix and match equipment may cause technical problems, and using equipment from one provider may not give as great a cost savings. TYPES OF VPN TUNNELING VPN supports two types of tunneling voluntary and compulsory. Both types of tunneling are commonly used. In voluntary tunneling, the VPN client manages connection setup. The client first makes a connection to the carrier network provider (an ISP in the case of Internet VPNs). Then, the VPN client application creates the tunnel to a VPN server over this live connection. In compulsory tunneling, the carrier network provider manages VPN connection setup. When the client first makes an ordinary connection to the carrier, the carrier in turn immediately brokers a VPN connection between that client and a VPN server. From the client point of view, VPN connections are set up in just one step compared to the two-step procedure required for voluntary tunnels. Compulsory VPN tunneling authenticates clients and associates them with specific VPN servers using logic built into the broker device. This network device is sometimes called the VPN Front End Processor (FEP), Network Access Server (NAS) or Point of Presence Server (POS). Compulsory tunneling hides the details of VPN server connectivity from the VPN clients and effectively transfers management control over the tunnels from clients to the ISP. In return, service providers must take on the additional burden of installing and maintaining FEP devices. VPN TUNNELING PROTOCOLS Several computer network protocols have been implemented specifically for use with VPN tunnels. The three most popular VPN tunneling protocols listed below continue to compete with each other for acceptance in the industry. These protocols are generally incompatible with each other. POINT-TO-POINT TUNNELING PROTOCOL (PPTP) Several corporations worked together to create the PPTP specification. People generally associate PPTP with Microsoft because nearly all flavors of Windows include built-in client support for this protocol. The initial releases of PPTP for Windows by Microsoft contained security features that some experts claimed were too weak for serious use. Microsoft continues to improve its PPTP support, though. LAYER TWO TUNNELING PROTOCOL (L2TP) The original competitor to PPTP for VPN tunneling was L2F, a protocol implemented primarily in Cisco products. In an attempt to improve on L2F, the best features of it and PPTP were combined to create new standard called L2TP. Like PPTP, L2TP exists at the data link layer (Layer Two) in the OSI model thus the origin of its name. INTERNET PROTOCOL SECURITY (IPSEC) IPsec is actually a collection of multiple related protocols. It can be used as a complete VPN protocol solution, or it can used simply as the encryption scheme within L2TP or PPTP. IPsec exists at the network layer (Layer Three) of the OSI model. Using PPTP PPTP packages data within PPP packets, then encapsulates the PPP packets within IP packets (datagrams) for transmission through an Internet-based VPN tunnel. PPTP supports data encryption and compression of these packets. PPTP also uses a form of General Routing Encapsulation (GRE) to get data to and from its final destination. PPTP-based Internet remote access VPNs are by far the most common form of PPTP VPN. In this environment, VPN tunnels are created via the following two-step process: The PPTP client connects to their ISP using PPP dial-up networking (traditional modem or ISDN). Via the broker device (described earlier), PPTP creates a TCP control connection between the VPN client and VPN server to establish a tunnel. PPTP uses TCP port 1723 for these connections. PPTP also supports VPN connectivity via a LAN. ISP connections are not required in this case, so tunnels can be created directly as in Step 2 above. Once the VPN tunnel is established, PPTP supports two types of information flow: Control messages for managing and eventually tearing down the VPN connection. Control messages pass directly between VPN client and server. Data packets that pass through the tunnel, to or from the VPN client PPTP CONTROL CONNECTION Once the TCP connection is established in Step 2 above, PPTP utliizes a series of control messages to maintain VPN connections. These messages are listed below. No. Name Description 1 StartControlConnectionRequest Initiates setup of the VPN session; can be sent by either client or server. 2 StartControlConnectionReply Sent in reply to the start connection request (1); contains result code indicating success or failure of the setup operation, and also the protocol version number. 3 StopControlConnectionRequest Request to close the control connection. 4 StopControlConnectionReply Sent in reply to the stop connection request (3); contains result code indicating success or failure of the close operation. 5 EchoRequest Sent periodically by either client or server to ping the connection (keep alive). 6 EchoReply Sent in response to the echo request (5) to keep the connection active. 7 OutgoingCallRequest Request to create a VPN tunnel sent by the client. 8 OutgoingCallReply Response to the call request (7); contains a unique identifier for that tunnel. 9 IncomingCallRequest Request from a VPN client to receive an incoming call from the server. 10 IncomingCallReply Response to the incoming call request (9), indicating whether the incoming call should be answered. 11 IncomingCallConnected Response to the incoming call reply (10); provides additional call parameters to the VPN server. 12 CallClearRequest Request to disconnect either an incoming or outgoing call, sent from the server to a client. 13 CallDisconnectNotify Response to the disconnect request (12); sent back to the server. 14 WANErrorNotify Notification periodically sent to the server of CRC, framing, hardware and buffer overruns, timeout and byte alignment errors. 15 SetLinkInfo Notification of changes in the underlying PPP options. With control messages, PPTP utlizes a so-called magic cookie. The PPTP magic cookie is hardwired to the hexadecimal number 0x1A2B3C4D. The purpose of this cookie is to ensure the receiver interprets the incoming data on the correct byte boundaries. PPTP SECURITY PPTP supports authentication, encryption, and packet filtering. PPTP authentication uses PPP-based protocols like EAP, CHAP, and PAP. PPTP supports packet filtering on VPN servers. Intermediate routers and other firewalls can also be configured to selectively filter PPTP traffic. PPTP AND PPP In general, PPTP relies on the functionality of PPP for these aspects of virtual private networking. authenticating users and maintaining the remote dial-up connection encapsulating and encrypting IP, IPX, or NetBEUI packets PPTP directly handles maintaining the VPN tunnel and transmitting data through the tunnel. PPTP also supports some additional security features for VPN data beyond what PPP provides. PPTP PROS AND CONS PPTP remains a popular choice for VPNs thanks to Microsoft. PPTP clients are freely available in all popular versions of Microsoft Windows. Windows servers also can function as PPTP-based VPN servers. One drawback of PPTP is its failure to choose a single standard for authentication and encryption. Two products that both fully comply with the PPTP specification may be totally incompatible with each other if they encrypt data differently, for example. Concerns also persist over the questionable level of security PPTP provides compared to alternatives. Routing Tunneling protocols can be used in a point-to-point topology that would generally not be considered a VPN, because a VPN is expected to support arbitrary and changing sets of network nodes. Since most router implementations support software-defined tunnel interface, customer-provisioned VPNs often comprise simply a set of tunnels over which conventional routing protocols run. PPVPNs, however, need to support the coexistence of multiple VPNs, hidden from one another, but operated by the same service provider. Building blocks Depending on whether the PPVPN runs in layer 2 or layer 3, the building blocks described below may be L2 only, L3 only, or combinations of the two. Multiprotocol Label Switching (MPLS) functionality blurs the L2-L3 identity. While RFC 4026 generalized these terms to cover L2 and L3 VPNs, they were introduced in RFC 2547. Customer edge device. (CE) In general, a CE is a device, physically at the customer premises, that provides access to the PPVPN service. Some implementations treat it purely as a demarcation point between provider and customer responsibility, while others allow customers to configure it. Provider edge device (PE) A PE is a device or set of devices, at the edge of the provider network, which provides the providers view of the customer site. PEs are aware of the VPNs that connect through them, and which maintain VPN state. Provider device (P) A P device operates inside the providers core network, and does not directly interface to any customer endpoint. It might, for example, provide routing for many provider-operated tunnels that belong to different customers PPVPNs. While the P device is a key part of implementing PPVPNs, it is not itself VPN-aware and does not maintain VPN state. Its principal role is allowing the service provider to scale its PPVPN offerings, as, for example, by acting as an aggregation point for multiple PEs. P-to-P connections, in such a role, often are high-capacity optical links between major locations of provider. Categorizing VPN security models From the security standpoint, VPNs either trust the underlying delivery network, or must enforce security with mechanisms in the VPN itself. Unless the trusted delivery network runs only among physically secure sites, both trusted and secure models need an authentication mechanism for users to gain access to the VPN. Some Internet service providers as of 2009[update] offer managed VPN service for business customers who want the security and convenience of a VPN but prefer not to undertake administering a VPN server themselves. Managed VPNs go beyond PPVPN scope, and are a contracted security solution that can reach into hosts. In addition to providing remote workers with secure access to their employers internal network, other security and management services are sometimes included as part of the package. Examples include keeping anti-virus and anti-spyware programs updated on each clients computer. Authentication before VPN connection A known trusted user, sometimes only when using trusted devices, can be provided with appropriate security privileges to access resources not available to general users. Servers may also need to authenticate themselves to join the VPN. A wide variety of authentication mechanisms exist. VPNs may implement authentication in devices including firewalls, access gateways, and others. They may use passwords, biometrics, or cryptographic methods. Strong authentication involves combining cryptography with another authentication mechanism. The authentication mechanism may require explicit user action, or may be embedded in the VPN client or the workstation. Trusted delivery networks Trusted VPNs do not use cryptographic tunneling, and instead rely on the security of a single providers network to protect the traffic. In a sense, they elaborate on traditional network- and system-administration work. Multi-Protocol Label Switching (MPLS) is often used to overlay VPNs, often with quality-of-service control over a trusted delivery network. Layer 2 Tunneling Protocol (L2TP) which is a standards-based replacement, and a compromise taking the good features from each, for two proprietary VPN protocols: Ciscos Layer 2 Forwarding (L2F) (obsolete as of 2009[update]) and Microsofts Point-to-Point Tunneling Protocol (PPTP). Security mechanisms Secure VPNs use cryptographic tunneling protocols to provide the intended confidentiality (blocking intercept and thus packet sniffing), sender authentication (blocking identity spoofing), and message integrity (blocking message alteration) to achieve privacy. Secure VPN protocols include the following: IPsec (Internet Protocol Security) A standards-based security protocol developed originally for IPv6, where support is mandatory, but also widely used with IPv4. Transport Layer Security (SSL/TLS) is used either for tunneling an entire networks traffic (SSL VPN), as in the OpenVPN project, or for securing individual connection. SSL has been the foundation by a number of vendors to provide remote access VPN capabilities. A practical advantage of an SSL VPN is that it can be accessed from locations that restrict external access to SSL-based e-commerce websites without IPsec implementations. SSL-based VPNs may be vulnerable to Denial of Service attacks mounted against their TCP connections because latter are inherently unauthenticated. DTLS, used by Cisco for a next generation VPN product called Cisco AnyConnect VPN. DTLS solves the issues found when tunneling TCP over TCP as is the case with SSL/TLS Secure Socket Tunneling Protocol (SSTP) by Microsoft introduced in Windows Server 2008 and Windows Vista Service Pack 1. SSTP tunnels Point-to-Point Protocol (PPP) or L2TP traffic through an SSL 3.0 channel. L2TPv3 (Layer 2 Tunneling Protocol version 3), a new[update] release. MPVPN (Multi Path Virtual Private Network). Ragula Systems Development Company owns the registered trademark MPVPN. Cisco VPN, a proprietary VPN used by many Cisco hardware devices. Proprietary clients exist for all platforms; open-source clients also exist. SSH VPN OpenSSH offers VPN tunneling to secure remote connections to a network (or inter-network links). This feature (option -w) should not be confused with port forwarding (option -L). OpenSSH server provides limited number of concurrent tunnels and the VPN feature itself does not support personal authentication. VPNs in mobile environments Mobile VPNs handle the special circumstances when one endpoint of the VPN is not fixed to a single IP address, but instead roams across various networks such as data networks from cellular carriers or between multiple Wi-Fi access points. Mobile VPNs have been widely used in public safety, where they give law enforcement officers access to mission-critical applications, such as computer-assisted dispatch and criminal databases, as they travel between different subnets of a mobile network. They are also used in field service management and by healthcare organizations, among other industries. Increasingly, Mobile VPNs are being adopted by mobile professionals and white-collar workers who need reliable connections. They allow users to roam seamlessly across networks and in and out of wireless-coverage areas without losing application sessions or dropping the secure VPN session. A conventional VPN cannot survive such events because the network tunnel is disrupted, causing applications to disconnect, time out, fail, or even the computing device itself to crash. Instead of logically tying the endpoint of the network tunnel to the physical IP address, each tunnel is bound to a virtual IP address that stays with the device. The Mobile VPN software handles the necessary network logins and maintains the application sessions in a manner transparent to the user. The Host Identity Protocol (HIP), under study by the Internet Engineering Task Force, is designed to support mobility of hosts by separating the role of IP addresses for host identification from their locator functionality in an IP network. With HIP a mobile host maintains its logical connections established via the host identity identifier while associating with different IP addresses when roaming between access networks. Conclusion: So what is a Virtual Private Network? As we have discussed, a VPN can take several forms. A VPN can be between two end-systems, or it can be between two or more networks. A VPN can be built using tunnels or encryption (at essentially any layer of the protocol stack), or both, or alternatively constructed using MPLS or one of the virtual router methods. A VPN can consist of networks connected to a service providers network by leased lines, Frame Relay, or ATM, or a VPN can consist of dial-up subscribers connecting to central

PSY 301, Introductory Psychology, 2004, Exam 3 :: UTEXAS Texas Psychology

Answers at bottom of test Exam 3 –November 8, 2004 1. Joleen’s friends describe her as being emotionally reserved most of the time but also able to become extremely angry every once and awhile. When she is angry at one of her friends, she usually does not confront them with her problem and instead behaves in a cold and distant manner. Sometimes, however, she will blow up in anger at them a week or two later. Which of the following would most likely be Freud’s evaluation of Joleen? a. Freud would claim that she is engaging in sublimation behaviors to protect herself. b. He would categorize her as anal expulsive and claim that it is due to unresolved issues she had during her anal stage of life. c. Freud would call her phallic defensive because of the conflicts she had with her parents between the ages of 3 and 5 (possibly even sexual abuse). d. He would say that she is obsessed with oral sensations, like talking, because she developed normally through the oral stage of life. e. Freud would claim that she is in love with her father. 2. What aspect of personality has been found to be a reliable predictor of marital dissatisfaction, poor reports of health, and depression? a. introversion b. low openness c. extraversion d. low agreeableness e. neuroticism 3. Lexi and Petri are identical twins who were separated at birth and grew up with very different families. Lexi is a skilled student who has three close friends and a loving boyfriend. Her adoptive family had difficulties accepting her when she was an infant and never really appreciated her until she reached puberty. Petri is also a good student and is very well liked in her sorority. Her adoptive family adored Petri until the family dissolved in a messy divorce when Petri was 16. Based on the core model of personality, who probably has higher self esteem, Lexi or Petri? 1. Lexi, because having a significant other (her boyfriend) is the most important thing for self esteem. 2.

Hinduism in American Life Essay -- Hindu Religion Compare Essays

Hinduism in American Life   Ã‚  Ã‚  Ã‚  Ã‚  The English word religion loosely translates into â€Å"rules† in Latin. Therefore, a religion teaches us how to think, how to act, and basically everything except what to eat in the morning. The Hindu and Christian religion agree on many things and our society follows some of the rules too because religion and laws are based on humanity. From holy literature many different ideas have been pawned but they are all supposed to lead you to the same things: a happy, healthy life, contribution to the world around us, and some kind of liberation after death. Concerning these ideals the Hindu religion has come up with three ways to make sure that everybody will get what they want out of life and those are the four stages, the four goals, and the four castes of life. There is so much holy war about which religion is right and wrong but if they all are striving for the same thing it is hard for me to see why they take place. In this essay I will show that Christian ity is very similar to Hinduism. The first thing that the Hindus follow to insure that you grow up to be productive (if you are in the upper three castes) is having specific stages of life. In other words throughout our life we have different responsibilities and duties which are spelled out by the Holy Scriptures. The four stages are student, â€Å"family man†, forest dweller and ascetic. The first stage of student requires you to go to school (if you were a male) and be initiated with the Upanayana ceremony. If a kid was at the top of the caste system and was preparing to be a priest he needs to get trained and before he gets trained he must have a Upanayana ceremony because without these he won’t know what he is talking about and won’t know and won’t have any credibility when he becomes a priest. It isn’t enough just to get an education and a little plaque on your wall, you must have lived a celibate life and you must be provided for by your family. This is a way of getting them to think a certain way since according to Hindu laws believe all members of a certain caste are supposed to do the same thing in the same way. The next stage of â€Å"family man† is also one that gets you not only to act a certain way but think a certain way. In this stage a man is supposed to get a wife, get a family, and repay his debts to everything that helped him including society. If you can do thes... ... to make duties and responsibilities more straightforward is the caste system. The caste system is based on reincarnation and the better Hindu that you’ve been in past lives makes you who you are. The highest people up on the social pyramid are the priests followed by kings, then merchants and finally the servents. It makes clear just how good and pure the person has been in this and past lives because they are either high up on the ladder or they aren’t. There is something beneficial about being seen as a good person. Since most of our morals in America come from the Bible if you are seen as a good Christian than you will get special job offers and when you meet your girlfriend’s parents they won’t hate you. In India you can tell who is a servant apart from who is a king because of what they do in a day and what kind of clothes they wear etc. In America we have little status symbols such as crosses that go around our neck and making conversation of wh at you learned in the bible or church. The whole point of the caste system is to segregate people and give some people certain advantages based on how well they accord with the popular religious beliefs based on region of the world.