Networking Internet

Building Scalable Cisco Internetworks BSCI Student Guide

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Additional info for Building Scalable Cisco Internetworks BSCI Student Guide v2.1

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0 for addressing, how would you overcome this obstacle and where would you implement the solution? 1 © 2004 Cisco Systems, Inc. All rights reserved. 1-11 The current proliferation of corporate mergers emphasizes the design issues inherent in private IP addressing (RFC 1918). A scalable network that integrates private addressing with a good IP addressing plan minimizes the impact of additions or reorganizations of divisions within a network. A scalable network enables companies that merge to connect at the core layer.

The bits that are not allocated as the network part or the subnetwork part of the address form a counting range for hosts. Host addresses are selected from these remaining bits and must also be numerically unique from all other hosts on the network. Copyright © 2004, Cisco Systems, Inc. Advanced IP Addressing 1-25 Note n The number of hosts created is calculated by the formula 2 – 2, where n is the number of bits available in the host portion. In the host counting range, the all-zeros pattern is reserved as the subnet identifier, and the all-ones pattern is reserved as a broadcast address to reach all hosts.

Scalable Network Design Access layer • Entry point for users into the internetwork Distribution layer • Consolidation point for traffic and location of corporate resources Core layer • Quick and efficient transit between divisions © 2004 Cisco Systems, Inc. All rights reserved. 1 1-4 Corporate organizational structure affects the design of a network. The structure of scalable network design reflects the information flow of a corporation. These design structures are referred to as hierarchical network designs.

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