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Data Communication and Networks Homework 5 1) In this question we consider some of the pros and cons of virtual circuit and datagram networks. a)

1)In this question we consider some of the pros and cons of virtual circuit and
datagram networks.
a) Suppose that routers were subject to conditions that might cause them to fail
fairly often. Would this argue in favor of a VC or datagram architecture? Why?
b) Suppose that a source node and a destination require that a fixed amount of
capacity always be a available at all routers on the path between the source and
destination node, for the exclusive use of traffic flowing between this source and
destination node. Would this argue in the favor of VC or datagram networks?
Why?
c) Suppose that the links and routers in the network never fail and that routing
paths used between all source/destination pairs remains constant. In this
scenario, does a VC or datagram architecture have more traffic overhead. Why?

Data Communication and Networks Homework 5 1) In this question we consider some of the pros and cons of virtual circuit and datagram networks. a) Suppose that routers were subject to conditions that might cause them to fail fairly often. Would this argue in favor of a VC or datagram architecture? Why? b) Suppose that a source node and a destination require that a fixed amount of capacity always be a available at all routers on the path between the source and destination node, for the exclusive use of traffic flowing between this source and destination node. Would this argue in the favor of VC or datagram networks? Why? c) Suppose that the links and routers in the network never fail and that routing paths used between all source/destination pairs remains constant. In this scenario, does a VC or datagram architecture have more traffic overhead. Why? 2) Consider the network below: 2 1 3 1 3 2 4 2 1 2 a) Suppose that this network is a datagram network. Show the forwarding table in router A, such that all traffic destined to host H3 is forwarded through interface 3. b) Suppose that this network is a datagram network. Can you write down a forwarding table in router A, such that all traffic from H1 destined to host H3 is Host1 Host2 Host3 D A B C
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Data Communication and Networks forwarded through interface 3, while all traffic from H2 destined to H3 is forwarded from interface 4? (Trick question)? c) Now suppose that this network is a virtual circuit network and that there is one ongoing call between H1 and H3 and another out going call between H2 and H3. Write down a forwarding table in router A such that all traffic from H1 destined to the host H3 is forwarded through interface 3 while all traffic from H2 to H4 is forwarded through interface 4. d) Assuming the same scenario as (c), write down the forwarding table in nodes B,C,D. 3) Consider a datagram network using 32-bit host addressing. Suppose a router has four links numbered 0 through 3, and packets are to be forwarded to the link interface as follows: Consider a datagram network using 32-bit host addressing. Suppose a router has four links numbered 0 through 3, and packets are to be forwarded to the link interface as follows: Destination address range Link interface 11100000 00000000 00000000 00000000 through 11100000 00111111 11111111 11111111 0 11100000 01000000 0000000 0000000 through 11100000 01000000 1111111 11111111 1 11100000 01000001 0000000 00000000 through 11100001 01111111 11111111 11111111 2 otherwise 3 a) provide a forwarding table that has four entries , uses longest prefix matching and forwards packets to the correct link interfaces. b) Describe how your forwarding table determines the appropriate link interface for datagram with destination addresses: 1)11001000 10010001 01010001 01010101 2)11100001 01000000 11000011 00111100
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