![](/images/new-backgrounds/1174958/17495899x1.webp)
Subnetting and Subnet Masks
Subnetting divides a network address into
For example: A Class B company has 100 LANs (Local Area Networks) with 100 to 200 nodes on each LAN. To classify the nodes by its LANs on one main network, this company segments the network address into 100 sub- network addresses. If the Class B network address is 150.1.x.x, the address can be segmented further from 150.1.1.x through 150.1.100.x.
A subnet mask is a
For the example above, if you want all the devices on the
Subnet Mask Routing and Filtering
0.0.0.0IP packets are transmitted to all devices.
IP packets are only transmitted to devices that are IP that’s first octet
255.0.0.0matches the sender’s IP address’s first octet.
| IP packets are only transmitted to devices that are IP that’s first two octets |
255.255.0.0 | match the sender’s IP address’s first two octets. |
| IP packets are only transmitted to devices that are IP that’s first three |
255.255.255.0 | octets match the sender’s IP address’s first three octets. |
50