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I've been served with a question to find Major Network Mask and I've only given Host IP address and sub-net mask. I have to find the Major Network Mask using Host IP and sub-net mask.

Another stackoverflow question says both are the same

I've attached screenshots of the question and the steps.

The step describes how to filter host and network information, but you need to find Major Network mask to draw M.D. line.

Step describing drawing M.D line

but in my question, I've only given Host IP and subnet mask. enter image description here

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I suspect this is classful addressing, so the major network mask would be 255.0.0.0 for 10.x.x.x. –  David Schwartz Sep 22 '13 at 22:44
    
Thanks! Yes it is I just found the Network Mask Table, it depends on the class of the IP. cisco.com/en/US/tech/tk365/… –  Michael Gamage Sep 22 '13 at 22:55
    
@Michael can you submit this as an answer outlining your findings? –  50-3 Sep 23 '13 at 9:36
    
@50-3 : Done! :) –  Michael Gamage Sep 24 '13 at 4:51

1 Answer 1

up vote 2 down vote accepted

Major Network Mask is always assigned by the class of the IP addresses used on the network.

If a network has Class A IP Addresses assigned to hosts, Major Network Mask is 255.0.0.0

Class A: 255.0.0.0

Class B: 255.255.0.0

Class C: 255.255.255.0

In my case, IP address 10.210.188.56 is a Class A IP address,so the Major Network Mask is 255.0.0.0

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