Benefits of VPNs in Java Drawer Code 3/9 in Java Benefits of VPNs

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Benefits of VPNs generate, create none none in none projects iPad Organizations usin none for none g VPNs benefit from increased flexibility and productivity. Remote sites and teleworkers can connect securely to the corporate network from almost anyplace. Data on a VPN is encrypted and undecipherable to anyone not entitled to have it.

VPNs bring remote hosts inside the firewall, giving them close to the same levels of access to network devices as if they were in a corporate office. Figure 6-19 shows leased lines as solid lines. The dotted lines represent VPN-based connections.

Consider these benefits when using VPNs:. Cost savings: Orga nizations can use cost-effective Internet providers to connect remote offices and users to the main corporate site. This eliminates expensive dedicated WAN links and modem banks. By using broadband, VPNs reduce connectivity costs while increasing remote connection bandwidth.

Security: Advanced encryption and authentication protocols protect data from unauthorized access. Scalability: VPNs use the Internet infrastructure within ISPs and carriers, making it easy for organizations to add new users. Organizations big and small can add large amounts of capacity without adding significant infrastructure.

. 6: Teleworker Services Figure 6-19. Benefits of VPNs Branch Office Traditional Layer 2 WAN Versus Mobile User Central Site Internet SOHO Types of VPNs This chapter discu none none sses two types of VPNs:. Site-to-site VPNs provide access between two physical sites to an intranet or extranet over a shared infrastructure, such as the Internet. Site-to-site VPNs are used by physical sites such as corporate offices, branch offices, and suppliers. Remote-access VPNs give remote users access to an intranet or extranet over a shared infrastructure, such as the Internet.

Remote-access VPNs typically are used by teleworkers and mobile users. VPNs create a private connection or network between two endpoints and typically include authentication and encryption. This topic is discussed in more detail later in this section.

. Site-to-Site VPNs Organizations use site-to-site VPNs to connect distant locations in the same way as a leased line or Frame Relay connection is used. Because most organizations now have Internet access, it makes sense to take advantage of the benefits of site-to-site VPNs. As illustrated in Figure 6-20, site-to-site VPNs also support company intranets and business partner extranets.

. Accessing the WAN, CCNA Exploration Companion Guide Figure 6-20 Site-to-Site VPNs Central Site DSL Cable Telecommuter Service Provider POP Leased Lines Internet Router Intranet Extranet Business-to-Business In effect, a site- none none to-site VPN is an extension of classic WAN networking. Site-to-site VPNs connect entire networks to each other. For example, they can connect a branch office network to a company headquarters network.

In a site-to-site VPN, hosts send and receive TCP/IP traffic through a VPN gateway, which could be a router, PIX firewall appliance, or an Adaptive Security Appliance (ASA). The VPN gateway is responsible for encapsulating and encrypting outbound traffic for all the traffic from a particular site and sending it through a VPN tunnel over the Internet to a peer VPN gateway at the target site. On receipt, the peer VPN gateway strips the headers, decrypts the content, and relays the packet toward the target host inside its private network.

. Remote Access VPNs Mobile users and t none none elecommuters use remote-access VPNs extensively. In the past, organizations (corporations, businesses, and other institutions) supported remote users using dialup networks. This usually involved a toll call and incurring long-distance charges to access the organization.

Most teleworkers now have access to the Internet from their homes and can establish remote VPNs using broadband connections, as shown in Figure 6-21. Similarly, a mobile worker can make a local call to a local ISP to access the organization through the Internet. In effect, this marks an evolutionary advance in dialup networks.

Remote-access VPNs can support the needs of telecommuters, mobile users, and extranet consumer-to-business.. 6: Teleworker Services Figure 6-21 Remote-Access VPNs Central Site DSL Cable POP Telecommuter Internet Router POP Mobile Extranet Consumer-to-Business In a remote-access VPN, each host (typically a PC) usually has VPN client software. Whenever the host tries to send any traffic, the VPN client software encapsulates and encrypts that traffic before sending it over the Internet to the VPN gateway at the edge of the target network. On receipt, the VPN gateway handles the data in the same way as it would handle data from a site-to-site VPN.

The VPN gateway could be a router, PIX firewall appliance, Adaptive Security Appliance (ASA), or VPN concentrator..
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