Computer Networking and Management Lesson 1

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Computer Networks and Internet - Overview

Packet Switched Networks : Routing

Discussion Question: How can circuit -like behaviour be provided considering bandwidth guarantees are needed for audio/video applications?
Things to Remember:
Is packet switching a 'slam
dunk winner'?
Great for bursty data Resource sharing No call setup Excessive congestion:
packet delay and loss Protocols needed for reliable data transfer, congestion control
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Packet Switched Networks : Routing
Goal: move packets among routers from source to destination There are two broad classes of packet-switched networks datagram networks and virtual circuit networks
They differ according to whether they route packets according to host destination addresses or according to virtual circuit numbers. We shall call any network that routes packets according to host destination addresses a datagram network. The IP protocol of the Internet routes packets according to the destination addresses hence the Internet is a Computer Networking and Management
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datagram network. We shall call any network that routes packets according to virtual circuit numbers a virtual circuit network. Examples of packet-switching technologies that use virtual circuits include X, frame relay, and Asynchronous Transfer Mode (ATM.
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