Interactive Problems, Computer Networking: A Top Down Approach

Longest Prefix Matching

Consider a datagram network using 8-bit host addresses.
Suppose a router uses longest-prefix matching, and has the following forwarding table:

Question List

1. Suppose a datagram arrives at the router, with destination address 00100000. To which interface will this datagram be forwarded using longest-prefix matching?

2. Suppose a datagram arrives at the router, with destination address 00100111. To which interface will this datagram be forwarded using longest-prefix matching?

3. Suppose a datagram arrives at the router, with destination address 11101011. To which interface will this datagram be forwarded using longest-prefix matching?

Solution

1. Since the address is 00100000, it will go to interface 5.

2. Since the address is 00100111, it will go to interface 5.

3. Since the address is 11101011, it will go to interface 6.

That's incorrect

That's correct

The answer was: 5

Question 1 of 3

Suppose a datagram arrives at the router, with destination address 00100000. To which interface will this datagram be forwarded using longest-prefix matching?

The answer was: 5

Question 2 of 3

Suppose a datagram arrives at the router, with destination address 00100111. To which interface will this datagram be forwarded using longest-prefix matching?

The answer was: 6

Question 3 of 3

Suppose a datagram arrives at the router, with destination address 11101011. To which interface will this datagram be forwarded using longest-prefix matching?

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