From the course: Introduction to Network Routing
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Subnetting
From the course: Introduction to Network Routing
Subnetting
- [Instructor] Subnet masks separate networks from hosts. Networks appear on the left side and hosts appear on the right side. And it's a sliding scale. You can move them back and forth. So you can either have more networks available or more hosts available. Subnet masks keep the network portion of our IP addresses separate from our hosts. And masks are represented by contiguous ones and zeros. Meaning you're only going to see all ones or all zeroes in a row. They're also represented by the classless inter domain routing or CIDR standard. Here's an example of a 24 bit subnet mask. Each section has a value of bits. There's four of them. And eight times four is 32. Anytime you're going to see all ones on the left-hand side, that's going to represent the networks of the IP addresses just above it. As examples, subnet masks are going to change our usable IPS's. And so we're going to see on a 192.168.1.0/24 254 usable…
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