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 )
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