Networking - Subnetting - Discussion

Discussion :: Subnetting - Subnetting (Q.No.20)

20. 

What is the subnetwork address for a host with the IP address 200.10.5.68/28?

[A]. 200.10.5.56
[B]. 200.10.5.32
[C]. 200.10.5.64
[D]. 200.10.5.0

Answer: Option C

Explanation:

This is a pretty simple question. A /28 is 255.255.255.240, which means that our block size is 16 in the fourth octet. 0, 16, 32, 48, 64, 80, etc. The host is in the 64 subnet.

Raviranjan said: (Jan 10, 2013)  
What is block size?

Vikas said: (Aug 17, 2013)  
What is the subnetwork address for a host with the IP address 200.10.5.68/28?

Vaishali said: (Feb 22, 2015)  
/28 means 11111111.11111111.11111111.11110000.

Means there are 4 ON's i.e 1's 2^4 = 16 block size.

So address will be:

200.10.5.0.
200.10.5.16.
200.10.5.32.
200.10.5.48.
200.10.5.64--------200.10.5.79.
200.10.5.80.

Means 200.10.5.68 lies b/w 200.10.5.64.

So answer is (C).

Teja said: (Aug 7, 2015)  
I have understood lot from your support about this concept.

Raja Waqas said: (Jun 16, 2016)  
Perfectly understood thanks @Vaishali.

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