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Unformatted text preview: 2. What are the two most important network-layer functions in a datagram network? The two most important network-layer functions in a datagram network are no call setup at network layer routers have no state about end-to-end connections The three most important functions in a virtual-circuit network are 1. call setup, teardown for each call before data can flow 2. every router on path maintains state for each passing connection 3. link, router resources (bandwidth, buffers) may be allocated to VC 3. What is the difference between routing and forwarding? Forwarding is moving packes from a routers input port to the appropriate output Routing is determining the end-to-routes between sources and destinations. 9. Describe how packet loss can occur at input ports. Describe how packet loss at input ports can be eliminated ( without using infinite buffers). Packet loss occurs if there is a buffer overflow due to queuing delays because of slow switching fabric speed. It can be eliminated if the switching fabric speed is at least n times as fast as the fabric speed....
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This note was uploaded on 02/28/2012 for the course IS 450 taught by Professor Martens,j during the Spring '08 term at UMBC.
- Spring '08