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Introduction to Computer Networks

1 Introduction to Computer NetworksChen YuIndiana UniversityBasic Building Blocks for Computer Networks Nodes PC, server, special-purpose hardware, sensors Switches Links: Twisted pair, coaxial cable, optical fiber, phone line, wireless radio channels network : two or most hosts connected by links/switchesAddressing and Routing Address: something that identifies a nodeoften a unique byte string. Routing: find a route (path) to the destination node based on its address. Types of traffic/addressing Unicast: to a single destination node. Broadcast: to all nodes on the network . Multicast: to some subnet of nodes on the Protocol A network protocol describes how communication entities (sender/receiver) should interact to accomplish a networking task. Format, order of messages sent and received Actions taken on message transmission, receipt Protocol define interface, not implementationsAllow two sides of a communication task to be independently designed / implemented.

1 Introduction to Computer Networks Chen Yu Indiana University Basic Building Blocks for Computer Networks • Nodes – PC, server, special-purpose hardware,

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