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IS-IS Network Design Solutions by Scott Sturgess, Abe Martey

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Summary

This broad chapter on IP routing concepts provides readers with an overview of IP routing protocols and an understanding of the underlying mechanisms involved in routing packets generally in any IP network and specifically on Cisco routers.

Addressing is a key aspect of routing, and IP addressing bears similar importance in IP routing. Subnetting and classless notions in IP addressing are intended to provide efficient allocation schemes, which effectively result in efficient use of assigned addresses from the public IP address space, as well as conservation of network resources in maintaining IP routing information on routers. Classless addressing provides the framework for prefix-length-based IP addressing schemes, such as CIDR and VLSM. ...

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