Download e-book for kindle: Computer Networks ISE: A Systems Approach, Fourth Edition by Larry L. Peterson, Bruce S. Davie

By Larry L. Peterson, Bruce S. Davie

ISBN-10: 0123740134

ISBN-13: 9780123740137

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Extra resources for Computer Networks ISE: A Systems Approach, Fourth Edition

Example text

Note that when we say a low-level protocol does not interpret the message it is given by some high-level protocol, we mean that it does not know how to extract any meaning from the data contained in the message. It is sometimes the case, however, that the low-level protocol applies some simple transformation to the data it is given, such as to compress or encrypt it. In this case, the protocol is transforming the entire body of the message, including both the original application’s data and all the headers attached to that data by higher-level protocols.

Because a packet-switched network limits the maximum size of packets, a host may not be able to send a complete message in one packet. The source may need to fragment the message into several packets, with the receiver reassembling the packets back into the original message. In other words, each flow sends a sequence of packets over the physical link, with a decision made on a packet-by-packet basis as to which flow’s packet to send next. Notice that if only one flow has data to send, then it can send a sequence of packets back-to-back.

Specifications are generally expressed using a combination of prose, pseudocode, state transition diagrams, pictures of packet formats, and other abstract notations. It should be the case that a given protocol can be implemented in different ways by different programmers, as long as each adheres to the specification. The challenge is ensuring that two different implementations of the same specification can successfully exchange messages. Two or more protocol modules that do accurately implement a protocol specification are said to interoperate with each other.

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Computer Networks ISE: A Systems Approach, Fourth Edition by Larry L. Peterson, Bruce S. Davie


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