Network Assignment 4

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Question Description

1. What is the difference between routing and forwarding?

2. Describe how packet loss can occur and be eliminated at:

(a) Router input ports?

(b) Router output ports?

3. Consider a datagram network using 32-bit host addresses. Suppose a router has four links, numbered 0

through 3, and packets are to be forwarded to the link interfaces as follows:

Destination address range: Interface:

11100000 00000000 00000000 00000000 0

through

11100000 00111111 11111111 11111111

11100000 01000000 00000000 00000000 1

through

11100000 01000000 11111111 11111111

11100000 01000001 00000000 00000000 2

through

11100001 01111111 11111111 11111111

otherwise 3

(a) Translate the above forwarding rules into a forwarding table that uses longest prefix

matching to forward packets to the correct interface. Your table should list prex match and

forwarding interface.

4. Discuss:

(a) How a hierarchical organization of the Internet allows it to scale to millions of users?

(b) Why are there different inter-AS and intra-AS routing protocols used in the Internet?

5. Describe how loops in paths can be detected in BGP.

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