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OSPF Network Design Solutions, Second Edition by Thomas M. Thomas

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Review of Interior Gateway Protocols and Exterior Gateway Protocols

The world of TCP/IP is both logical and a little bit magical. Logical in the way that it adheres to well-defined inflexible rules; Class A IP addressing schemes use a default mask of 255.0.0.0; Layer 3 addresses are thirty-two bits in length subdivided into four octets containing eight bits each. Without routing protocols, packets don’t reach their final destination. The routing of packets through a network infrastructure is where the magical part comes into play.

Because packets have both a source and destination address, it would seem that with appropriately intelligent routers factored into the mix, packets could find their way without much assistance through a network. This ...

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