By Mark McGregor

Half 1: Internetwork layout offers a collection of common directions for making plans internetworks and particular feedback for a number of key internetworking implementations. half 1 makes a speciality of determining the fundamental applied sciences and acceptable implementations for particular environments. half 2: Internetworking Case stories presents functional examples illustrating how readers can enforce Cisco platforms software program gains. Case stories tackle implementation matters and convey the way to observe good points. unique configuration dossier examples and community diagrams are integrated.

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When fast switching is enabled, load balancing occurs on a perdestination basis. Routers can automatically compensate for failed WAN links through routing algorithms of protocols, such as IGRP, OSPF, and IS-IS. If one link fails, the routing software recalculates the routing algorithm and begins sending all traffic through another link. This allows applications to proceed in the face of WAN link failure, improving application availability. The primary disadvantage of duplicating WAN links to each remote office is cost.

An access list is a sequence of statements, each of which either permits or denies certain conditions or addresses. Access lists can be used to permit or deny messages from particular network nodes and messages sent using particular protocols and services. htm (15 of 35) [9/16/2000 5:03:39 PM] Internetworking Design Basics Area or network access filters are used to enforce the selective transmission of traffic based on network address. You can apply these on incoming or outgoing ports. Service filters use access lists applied to protocols (such as IP's UDP), applications such as the Simple Mail Transfer Protocol (SMTP), and specific protocols.

The tunnel interface includes a GRE header and enqueues the packet to the transport protocol (IP) for the destination address of the tunnel interface. 3. IP looks up the route to the tunnel destination address and learns that the path is the tunnel interface. 4. Once again, the packet is placed in the output queue of the tunnel interface, as described in Step 1, hence, the routing loop. When a router detects a recursive routing loop, it shuts down the tunnel interface for 1 to 2 minutes and issues a warning message before it goes into the recursive loop.

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CCIE Fundamentals Network Design and Case Studies by Mark McGregor
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