Computer Networking and Management Lesson 1



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Computer Networks and Internet - Overview
Things to Remember: Networks are complex Many pieces l
Hosts l
Routers l
Links of various medial Applications l
Protocols l
Hardware, software
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Layer Functions
In a computer network, each layer may perform one or more of the following generic set of tasks l
Error control, which makes the logical channel between the layers in two peer network elements more reliable. l
Flow control, which avoids overwhelming a slower peer with PDUs. l
Segmentation and reassembly, which at the transmitting side divides large data chunks into smaller pieces and at the receiving side reassembles the smaller pieces into the original large chunk. l
Multiplexing, which allows several higher-level sessions to share a single lower-level connection.
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