Download Cisco CCIE Fundamentals Network Design and Case Studies by Cisco PDF

By Cisco

This ebook offers internetworking layout and implementation info and is helping you establish and enforce sensible internetworking recommendations which are either versatile and scalable. This e-book used to be constructed to aid pros getting ready for Cisco qualified Internetwork specialist (CCIE) candidacy, notwithstanding it's a useful source for all internetworking execs. it's designed to be used at the side of different Cisco manuals or as a standalone reference. you'll locate it important to consult the Cisco CCIE basics: Case stories, which supplies case reports and examples of the community layout options defined during this publication.

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Token Ring Router Multiprotocol backbone TCP/IP session • Reliable transport • TCP flow control • Error recovery 3745 Token Ring Router 3x74 controller Acknowledgments Acknowledgments LLC2 session T1 timer LLC2 session T1 timer In Figure 2-12, the routers locally terminate Logical Link Control type 2 (LLC2) data-link control sessions. Instead of end-to-end sessions, during which all session control information is passed over the multiprotocol backbone, the routers take responsibility for acknowledging packets that come from hosts on directly attached LANs.

Today, network designers are replacing hubs in their wiring closets with switches to increase their network performance and protect their existing wiring investments. Routers segment network traffic based on the destination network layer address (Layer 3) rather than the workstation data link layer or MAC address. Consequently, routers are protocol dependent. Benefits of Switches (Layer 2 Services) An individual Layer 2 switch might offer some or all of the following benefits: • Bandwidth—LAN switches provide excellent performance for individual users by allocating dedicated bandwidth to each switch port.

This minimizes the effect of a failure on a particular segment. For example, if you have 100 stations attached to a single switch, move some of them to other switches. This reduces the effect of a hub failure and of certain subnetwork failures. If you place an internetworking device (such as a router) between segments, you protect against additional problems and cut subnetwork traffic. As shown in Figure 2-21, redundancy can be employed to help minimize media failures. Each station in this figure is attached to two different media segments.

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