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Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Network Layer
Exercise:
Review
Question:22 | ISBN:9780132856201 | Edition: 6

Question

Discuss how a hierarchical organization of the Internet has made it possible

to scale to millions of users.

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Answer

Routers are organized into autonomous systems (ASs). Within an AS, all routers run the same intra-AS routing protocol. The problem of scale is solved since an router in an AS need only know about routers within its AS and the subnets that attach to the AS. To route across ASes, the inter-AS protocol is based on the AS graph and does not take individual routers into account.

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