From the course: Cisco Certified DevNet Associate DEVASC 1.1 (200-901) Cert Prep

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Subnetting

Subnetting - Cisco Tutorial

From the course: Cisco Certified DevNet Associate DEVASC 1.1 (200-901) Cert Prep

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Subnetting

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- [Instructor] Let's revisit some of what we talked about in previous videos and fit some of these topics together. We've discussed IP address formatting, we've talked about how the subnet mask informs us of the network versus the host portion of that address, and we've talked about binary conversion. We've also talked about classful addressing schemes, specifically Class A, B, and C address ranges. We also have the concept of classless addressing as opposed to those classful schemes. This is where subnetting comes into play, allowing us to create classless addressing, dividing our larger blocks of addresses into subblocks. So, let's say we have only two IP addresses that need to communicate on a network segment. In this example, you'll see 192.168.1.1 and 192.168.1.2. We see our network address is 192.168.1.0, and this has a /24 subnet mask, or in other words, 255.255.255.0. This means that we can have 254 different hosts on this network. But in our case, we only need two. So…

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