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IP Subnetting
Each IP address contains a node address and a network address.
The subnet mask determines which bits identify a node address, and
which bits identify a network address.
The network bits are the 1’s, the node bits are the 0’s.
Default subnet masks
•
Class A – 255.0.0.0 255 networks, > 16million nodes
•
Class B – 255.255.0.0 64K networks, 64K nodes
•
Class C – 255.255.255.0 >16 million networks, 255 nodes
CIDR = Classless Inter Domain Routing
Eliminates class restrictions giving finer control to netmask.
Uses 192.168.1.99/24 nomenclature ( 24 = # of ones from left )