(i) What are two differences between how a virtual circuit packet switching netw
ID: 2084485 • Letter: #
Question
(i) What are two differences between how a virtual circuit packet switching network works and how a datagram based packet switching network works? (ii) A virtual path switch in an ATM network has the switch translation table shown in Fig. 2.3. The switch receives a cell with the VPI (Virtual Path Identifier) = 23 VCI (Virtual Channel Identifier) = 6. What are the VPI and VCI values of the output cell? (iii) Explain how the AAL 5 adaption layer protocol operates to send data packets from higher layers using ATM cells. (iv) Explain what is a label stack is in the context of an MPLS (Multi Protocol Label Switching) network. Describe how a label stack may be used to create a tunnel in an MPLS network.Explanation / Answer
i)
The main difference between vircuit circuit packet switching network and datagram based packet switching network is that virtual circuit networks provide connection-oriented service (reservation of resources for the time in which the newly setup VC is going to be used by a data transfer session) while datagram based networks provide connectionless service (No Need of reservation of resources as there is no dedicated path for a connection session.)
Another difference is that in virtual circuit networks data follows a particular dedicated path and hence the packets reach in order to the destination which means that it is a reliable service whereas in datagram networks data packets reach destination in any order, means they need not reach in the order in which they were sent and hence are not reliable
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