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Data Matrix for visual C# 1: Introduction to WANs in Java Integration 39 barcode in Java 1: Introduction to WANs

1: Introduction to WANs using barcode implement for none control to generate, create none image in none applications.generate data matrix c# Figure 1-29. GTIN-8 Broadband Wireless Internet Backbone WiMAX 802.16 Transmitter Nonline of Sight Transmission Home Local-Area Network DSL, cable, and wireless br none for none oadband services are described in more detail in 6, Teleworker Services. . VPN Technology Security risks are incurred none none when a teleworker or remote office uses broadband services to access the corporate WAN over the Internet. To address security concerns, broadband services provide capabilities for using Virtual Private Network (VPN) connections to a VPN server, which typically is located at the corporate site. A VPN is an encrypted connection between private networks over a public network such as the Internet.

Instead of using a dedicated Layer 2 connection such as a leased line, a VPN uses virtual connections called VPN tunnels, which are routed through the Internet from the company s private network to the remote site or employee host.. VPN Benefits Benefits of VPN include the none none following:. Cost savings: VPNs enable o rganizations to use the global Internet to connect remote offices and remote users to the main corporate site, thus eliminating expensive dedicated WAN links and modem banks. Security: VPNs provide the highest level of security by using advanced encryption and authentication protocols that protect data from unauthorized access..

Accessing the WAN, CCNA Exploration Companion Guide Scalability: Because VPNs u se the Internet infrastructure within ISPs and devices, it is easy to add new users. Corporations can add large amounts of capacity without adding significant infrastructure. Compatibility with broadband technology: VPN technology is supported by broadband service providers such as DSL and cable, so mobile workers and telecommuters can take advantage of their home high-speed Internet service to access their corporate networks.

Business-grade, high-speed broadband connections can also provide a costeffective solution for connecting remote offices.. Types of VPN Access Two types of VPN access exi st:. Site-to-site VPNs: Site-to- none none site VPNs connect entire networks to each other. For example, they can connect a branch office network to a company headquarters network, as shown in Figure 1-30. Each site is equipped with a VPN gateway, such as a router, firewall, VPN concentrator, or security appliance.

In the figure, a remote branch office uses a site-to-site VPN to connect with the corporate head office. Remote-access VPNs: Remote-access VPNs enable individual hosts, such as telecommuters, mobile users, and extranet consumers, to access a company network securely over the Internet, as shown in Figure 1-31. Each host typically has VPN client software loaded or uses a web-based client.

. Site-to-Site VPNs Company Head Office Branch A Figure 1-30. Head Office VPN Gateway none for none (VPN Concentrator). Tun n ISP A NT un Internet ISP C ISP B Remote VPN Gateway s (VPN-Enabled Routers). Intranet Web/TFTP Server LAN Branch B 1: Introduction to WANs Figure 1-31. Remote-Access VPNs Company Head Office VPN Gateway VPN Tunnel Internet ISP Cable VPN Client Login User Name: Intranet WEB/TFTP Server Password: Teleworker 1 Teleworker 2 Metro Ethernet Metro Ethernet is a rapi none for none dly maturing networking technology that broadens Ethernet to the public networks run by telecommunications companies. IP-aware Ethernet switches enable service providers to offer enterprises converged voice, data, and video services such as IP telephony, video streaming, imaging, and data storage. Figure 1-32 shows that by extending Ethernet to the metropolitan area, companies can provide their remote offices with reliable access to applications and data on the corporate headquarters LAN.

Here are some benefits of Metro Ethernet:. Reduced expenses and adm inistration: Metro Ethernet provides a switched, highbandwidth Layer 2 network that can manage data, voice, and video all on the same infrastructure. This characteristic increases bandwidth and eliminates expensive conversions to ATM and Frame Relay. The technology enables businesses to inexpensively connect numerous sites in a metropolitan area to each other and to the Internet.

Easy integration with existing networks: Metro Ethernet connects easily to existing Ethernet LANs, reducing installation costs and time. Enhanced business productivity: Metro Ethernet enables businesses to take advantage of productivity-enhancing IP applications that are difficult to implement on TDM or Frame Relay networks, such as hosted IP communications, VoIP, and streaming and broadcast video..

Accessing the WAN, CCNA Exploration Companion Guide Figure 1-32. Service Provider Metro Ethernet Branch Office (Main St.). Internet Service Provider Metro E thernet Head Office (Downtown) Branch Office (Suburb). Branch Office (Industria none for none l Park).
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