Cisco CCIE Fundamentals: Network Design by Mark McGregor

By Mark McGregor

For a classy view of networking layout recommendations that is going from lofty to granular within the blink of an eye fixed, community layout and Case stories is a definite winner. This vast access in Cisco's transforming into choice of reference books presents equivalent components educational concept and sensible application.The first half the booklet bargains completely with layout, beginning with an evidence of the 3 forms of networks (campus, huge region, and distant connections). The booklet outlines the layout tendencies governing these networks this present day and explains the units used to create them and their features, in addition to potent how you can combine the 3. the remainder chapters veer off into extra particular community varieties, equivalent to Asynchronous move Mode (ATM), web Protocol (IP), and Switched LAN, and the apparatus and protocols most suitable for these situations.The moment half this quantity is devoted to real-word challenge fixing. The eleven "case examine" chapters specialize in quite sticky matters - reminiscent of Routing info Protocol (RIP) and Open Shortest direction First (OSPF) redistribution, lowering provider ads Protocol (SAP) site visitors in Novell Internetwork Packet alternate (IPX) networks, and person Datagram Protocol (UDP) broadcast flooding - and suggest configuration strategies to mend them. As ordinary, this books holds the needful flood of appendices; even if, during this example the "Reference and advised studying" access is surely the main valuable.

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Extra info for Cisco CCIE Fundamentals: Network Design

Sample text

Suppose you have a network connected to the Internet, and you want any host on an Ethernet to be able to form TCP connections to any host on the Internet. However, you do not want Internet hosts to be able to form TCP connections to hosts on the Ethernet except to the SMTP port of a dedicated mail host. SMTP uses TCP port 25 on one end of the connection and a random port number on the other end. The same two port numbers are used throughout the life of the connection. Mail packets coming in from the Internet will have a destination port of 25.

One way to do this is to restrict the transmission of Service Advertisement Protocol (SAP) messages. SAP messages allow NetWare servers to advertise services to clients. The organization might have another policy stating that all NetWare services should be provided locally. If this is the case, there should be no reason for services to be advertised remotely. SAP filters prevent SAP traffic from leaving a router interface, thereby fulfilling this policy. 2-18 Cisco CCIE Fundamentals: Network Design Evaluating Distribution Services Figure 2-13 Policy-based distributation: SAP filtering.

For direct bridging between Ethernet and Token Ring environments, use either source-route translational bridging or source-route transparent bridging (SRT). Source-route translational bridging translates between Token Ring and Ethernet frame formats; SRT allows routers to use both SRB and the transparent bridging algorithm used in standard Ethernet bridging. When bridging from the SRB domain to the transparent bridging domain, the SRB fields of the frames are removed. RIFs are cached for use by subsequent return traffic.

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