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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
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: 172.16.0000 00010.0000000 to 172.16.0000011.11111111Range of IP address: 172.16.2.0 to 172.16.3.255First and last IP address are reservedValid Host IP address: 172.16.2.1 to 172.16.3.254Statement i: 172.16.1.100It is not valid since it does not fall in the rangeStatement ii: 172.16.1.198It is not valid since it does not fall in the rangeStatement iii: 172.16.2.255It is valid since it does fall in the valid rangeStatement iv: 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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