Virtual circuit & datagram networks
5 important questions on Virtual circuit & datagram networks
What are the two most important network-layer functions in a datagram network?
Datagram-based network layer: forwarding; routing
- What arethethreemost important network-layer functionsin avirtual circuit network?
Forwarding,routingand call setup
- What is the difference between routing and forwarding?
Forwarding is about moving a packet from a router’s input link to the appropriate output link.Routingisabout determiningtheend-to-routesbetween sourcesand destinations.
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- Do the routers in both datagram networks and virtual-circuit networks use forwarding tables?If so,describetheforwardingtablesfor both classesof networks.
Yes, both use forwarding tables.
Give two example computer applications for which connection-oriented service is appropriate. Also give two examples for which connectionless service is best.
Filetransfer,remotelogin,andvideoondemandneedconnection-orientedservice.On theother hand,credit card verification and other point-of-saleterminals,electronicfunds transfer,and many formsof remotedatabaseaccessareinherently connectionless,with a query going one way and the reply coming back the other way.
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