From the course: Cisco Certified Support Technician (CCST) Networking Cert Prep

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Calculating usable ranges of IPv4 addresses

Calculating usable ranges of IPv4 addresses

From the course: Cisco Certified Support Technician (CCST) Networking Cert Prep

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Calculating usable ranges of IPv4 addresses

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(gentle music) - [Instructor] We know that if we add bits to a default subnet mask, that's going to take that network and divide it up into different subnets. The question is, within each of those subnets, which IP addresses are we allowed to use and assign to the devices in that subnet? That's what we're going to answer in this video. Remember, we cannot assign a network address, that's where all of the host bits are zeros. We cannot assign a directed broadcast address. That's where all of the host bits are ones. So how do we know the networks that get created and what network addresses are usable within each of those networks or within each of those subnets? And to give us a visual, let's start with a really simple example. Let's take 172.25.0.0, that's a Class B network with a default subnet mask of a /16. If I apply a /24 subnet mask, in other words, I add eight network bits, that's going to give me the following subnets. It's going to be 172.25.0.0/24, .1.0/24, .2.0/24, all the…

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