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15. Your computer has been allocated the IP address 192.168.123.5. Your subnet mask is 255.255.0.0.

a) What is your Network number (ID)?



b) What is the default Subnet mask for a Class C network?

Any ideas of the answers? ](*,) ](*,)
 

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Network ID is 192

The default subnet mask for a class C is 255.255.255.0


Long time since i did this at Uni, think that is correct
 

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I thought it was somthing like that.

Thanks theirs lots of questions that I dont understand can i email you them as you seem to know a lot.
 

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Class C is 255.255.255.0 not sure about Net ID think it is the 192 tho.

Network Class is easy to work out. Each address is 8-bit so a subnet of 255.255.0.0 is 16bit so Class B
255.0.0.0 is 8bit so Class A
255.255.255.255 is 32bit so Class D
 

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You got me thinking now

192.168.123.5

subnet 255.255.0.0 is class B

 

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TrickyMG said:
yea so net id is 192.168.0.0

255 in the mask basically means that the corresponding IP bit does not alter.
Yep. It's also known as the network address.

Of course you don't have to have 255 in the mask, it could be any number you like.
 

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so the answer is not B then?
 

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if the first part of the address is between 0 and 127 then it is a class A
if the first part is between 128 and 191 then it is a class B
if the first part is between 192 and 223 then it is a class C.
like said above a class A is made up 8 bits, a class B is made up of 16 bits, a class C is made up of 24 bits.
So yours is a class B
 
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