Computer Networks I IP addressing
Computer Networks I IP addressing
Computer Networks I IP addressing
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<strong>Computer</strong> <strong>Networks</strong> I 14<br />
Subnetting<br />
RFC<br />
950<br />
●<br />
●<br />
Problem: The A and B class networks are underutilized.<br />
Solution: Divide them in smaller sub-networks. Part of the host id<br />
is used to identify the sub-net.<br />
0<br />
0 1 2 3 4 5 6 7 8 9<br />
10 net id<br />
1<br />
0 1 2 3 4 5 6 7 8 9<br />
2<br />
0 1 2 3 4 5 6 7 8 9<br />
host id<br />
3<br />
0 1<br />
i<br />
RFC<br />
1878<br />
n bits -> 2 n subnet<br />
sub-net id<br />
● The scheme shows a 4-bit sub-net id. Therefore, there are 16<br />
subnets with 2 12 -2 hosts each.
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