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Lesson 1
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Planning a Routing and Remote Access Strategy
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Lesson 1: Planning a Routing and Remote Access Strategy
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The common need to connect networks at different locations compounds the chal lenges that network designers and administrators face in planning, implementing, and maintaining an internal network. As you learned in 3, Planning Internet Con nectivity, a connection between networks at remote locations requires a wide area network (WAN) connection of some type and a router at each site. The WAN is essen tially a two-node network that serves only to carry traffic between the two sites, and the routers determine what traffic is permitted to enter and leave each site. Computers running Windows Server 2003 can function as the routers in this arrangement, using RRAS to provide dynamic routing, traffic management, and security features.
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After this lesson, you will be able to
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Describe the characteristics of the WAN technologies most commonly used for remote
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network connections
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Decide whether to use static routing or dynamic routing on your network Select the dynamic routing protocol most suitable for your network List the components needed to route IP multicast traffic to an internetwork
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Estimated lesson time: 15 minutes
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Choosing a WAN Topology
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When an enterprise consists of multiple networks at remote locations, connecting them into a single large internetwork is nearly always desirable, but not always economically practical. When deciding whether to connect the network sites, an important part of the process is considering what topologies you can use for the internetwork. Just as with LAN design, in which there are a variety of wiring topologies you can use to connect the computers, internetwork design lets you connect your sites in several different ways. When you have only two network sites, there is obviously only one topology available. You install a router at each site and connect the routers using a WAN link, as shown in Figure 5-1. In this case, you decide which WAN technology to use based primarily on the bandwidth you need and the cost of the link.
5
Using Routing and Remote Access
WAN Router Router
Figure 5-1 Two networks connected with a WAN link
When you have more than two sites to connect, you have more topology choices. The most efficient, and usually the most expensive, remote networking solution is to have a separate WAN link connecting each pair of sites, forming a mesh topology, as shown in Figure 5-2. Because each pair of sites has its own dedicated link, the arrangement is highly fault tolerant. Failure of a single link affects only the communications between the two sites connected by that link, and the other connections can compensate by relaying information to the disconnected sites.
Site 1
Site 5
Site 2
Site 4
Site 3
Figure 5-2 Five network sites connected by WAN links in a mesh topology
Lesson 1
Planning a Routing and Remote Access Strategy
The problem with the mesh topology becomes obvious when your enterprise has more than three or four sites. Because each connection requires a router at each site and a separate WAN connection, the amount of time and money required to install and main tain them can quickly become astronomical. A network with three sites requires only three WAN connections to create the mesh, but four sites require six WAN connections. By the time you get to an enterprise with eight sites, you must install 28 separate WAN connections and 56 routers to create the mesh.
You can implement a large mesh topology using relatively inexpensive equipment, such as dial-up modems and telephone lines, but the performance of an internetwork using slow connections like these is usually not worth the effort.
Off the Record
Another method for connecting sites is to create a ring topology. In this topology, the network designer connects each site to its two closest neighbors, as shown in Figure 5-3. This topology requires only two routers and two WAN connections at each site, so it is much easier to install and maintain, as well as being more affordable. However, the ring topology is less efficient than the mesh, because it is not possible for the network at each site to communicate directly with every other site. Unless two sites are adjacent in the ring, traffic has to pass through one or more intermediate sites to get to its destination. This means more traffic on each WAN link, possibly requiring a faster connection than needed with a mesh topology.
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