Part 3 - Features of VPN: I) SECURITY A well-designed VPN...

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Features of VPN: I)) SECURITY A well-designed VPN uses several methods for keeping your connection and data secure: Firewalls Encryption IPSec AAA Server . 1) Firewalling Advent of high-speed access media like cable modems and Digital Subscriber Lines (DSLs), that are now becoming more available and affordable, can overcome the access speed limitations. But, the service providers offering high-speed accesses cannot have easy access to a company’s Intranet due to firewall and security restrictions. Companies restrict access to prevent unauthorized intruders or “hackers” from stealing proprietary information. There is an urgent need for a reliable mechanism to authenticate valid users and restrict their accesses based on their access privileges. 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 VPN supports at least three different modes of use: Remote access client connections LAN-to-LAN internetworking Controlled access within an intranet A firewall provides a strong barrier between your private network and the Internet. You can set firewalls to restrict the number of open ports, what type of packets are passed through and which protocols are allowed through. Some VPN products, such as Cisco's 1700 routers , can be upgraded to include firewall capabilities by running the appropriate Cisco IOS on them. You should already have a good firewall in place before you implement a VPN, but a firewall can also be used to terminate the VPN sessions 2) Encryption You must use data encryption to provide data confidentiality for the data that is sent between  the VPN client and the VPN server across a shared or public network, where there is always  a risk of unauthorized interception. You can configure the VPN server to  force encrypted  communications. Users who connect to that server must encrypt their data or a connection is  not allowed. For VPN connections, the Windows Server 2003 family uses Microsoft Point-to- Point Encryption (MPPE) with the Point-to-Point Tunneling Protocol (PPTP) and Internet  Protocol security (IPSec) encryption with the Layer Two Tunneling Protocol (L2TP). Because data encryption is performed between the VPN client and VPN server, data
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Part 3 - Features of VPN: I) SECURITY A well-designed VPN...

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