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Author Topic: Identifying Network Classes  (Read 1793 times)
DXU76
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« on: April 04, 2006, 09:19:50 pm »

Hi All,

I subscribe to QOD and came across this question.

What is the Network ID of 120.192.0.1 if it has been assigned its default subnet mask?

I answered 120.192, which is wrong. The correct answer is 120. And here is the explanation given by QOD: 120.192.0.1 is a class A IP address, therefore the default subnet mask for this IP address is 255.0.0.0, also known as /8, which means that the first 8 bits - ie the first octet - are the network bits and constitute the network ID.

How do you know that 120.192.0.1 is a Class A address?
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Spid
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« Reply #1 on: April 05, 2006, 12:13:02 pm »

It is class 'A' and the explanation is correct.

Here are some links for you:

http://www.answers.com/topic/ip-address
http://www.cisco.com/univercd/cc/td/doc/product/atm/l2020/2020r21x/planning/appndxa.htm#xtocid87492

HTH
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DXU76
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« Reply #2 on: April 05, 2006, 10:05:45 pm »

Got it thanks. (in Class A address the 1st bit of the 1st octet is always off, therefore range is 1 - 126 for the 1st octet)
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