Question Bank - Computer Networks

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Your router has the following IP address an Ethenet0: 172.16.2.1/23. Which of the following can be valid host IDs on the LAN interface attached to the router?1. 172.16.1.1002. 172.16.1.1983. 172.16.2.2554. 172.16.3.0

A.
1 only
B.
2 and 3 only
C.
3 and 4 only
D.
None of the above

Solution:

Concept:a.b.c.d/NIDTherefore 23 bits are in NID and only 9 bits for Host id.Explanation:Last two-byte of IP address is represented in binaryEthernet: 172.16.2.1/23Range of IP address: 172.16.00000010.0000000 to 172.16.0000011.11111111Range of IP address: 172.16.2.0 to 172.16.3.255First and last IP address is reservedValid Host IP address: 172.16.2.1 to 172.16.3.254Statement 1: 172.16.1.100It is not valid since it does not fall in the rangeStatement 2: 172.16.1.198It is not valid since it does not fall in the rangeStatement 3: 172.16.2.255It is valid since it does fall in the valid rangeStatement 4:172.16.3.0It is valid since it does fall in the valid rangeHence option 3 is the correct answer.Important Point:NID stands for network ID.

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