Your router has the following IP address on Ethernet: 172.16.2.1/23. Which of the following can be valid host IDs on the LAN interface attached to the router? i) 172.16.1.100 ii) 172.16.1.198 iii) 172.16.2.255 iv) 172.16.3.0
Your router has the following IP address on Ethernet: 172.16.2.1/23. Which of the following can be valid host IDs on the LAN interface attached to the router? i) 172.16.1.100 ii) 172.16.1.198 iii) 172.16.2.255 iv) 172.16.3.0 Correct Answer (iii) and (iv) 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: 172.16.0000 00010.0000000 to 172.16.0000011.11111111
Range of IP address: 172.16.2.0 to 172.16.3.255
First and last IP address are reserved
Valid Host IP address: 172.16.2.1 to 172.16.3.254
Statement i: 172.16.1.100
It is not valid since it does not fall in the range
Statement ii: 172.16.1.198
It is not valid since it does not fall in the range
Statement iii: 172.16.2.255
It is valid since it does fall in the valid range
Statement iv: 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.
