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IP address for Device-A is: 172.255.17.30/21 and Device-B is: 172.255.31.30/21. Are these devices on the same...

IP address for Device-A is: 172.255.17.30/21 and Device-B is: 172.255.31.30/21. Are these devices on the same subnet or on different subnets? What is/are the subnet address/addresses?

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Answer #1

Network id is calculated by doing bitwise AND of ip address with the subnet.

For device A:-

Subnet is 255.255.248.0(because it si /21)

For device B:-

Subnet is 255.255.248.0(because it si /21)

So these devices have the same subnet.

Network Id of A:-

172.255.16.0

Network id of B:-

172.255.24.0

So, A and B are in different network but their subnet mask is same.

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