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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. 172.16.1.100

2. 172.16.1.198

3. 172.16.2.255

4. 172.16.3.0


1. 1 only
2. 2 and 3 only
3. 3 and 4 only
4. None of the above

1 Answer

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Best answer
Correct Answer - Option 3 : 3 and 4 only

Concept:

a.b.c.d/NID

Therefore 23 bits are in NID and only 9 bits for Host id.

Explanation:

Last two-byte of IP address is represented in binary

Ethernet: 172.16.2.1/23

Range of IP address: 172.16.00000010.0000000 to 172.16.0000011.11111111

Range of IP address: 172.16.2.0 to 172.16.3.255

First and last IP address is reserved

Valid Host IP address: 172.16.2.1 to 172.16.3.254

Statement 1: 172.16.1.100

It is not valid since it does not fall in the range

Statement 2: 172.16.1.198

It is not valid since it does not fall in the range

Statement 3: 172.16.2.255

It is valid since it does fall in the valid range

Statement 4:172.16.3.0

It is valid since it does fall in the valid range

Hence option 3 is the correct answer.

Important Point:

NID stands for network ID.

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