![]() CIDR stands for Classless Inter-Domain Routing, and with this notation, we do not represent the subnet mask with the dotted notation, but we simply say how many 1s are contained in it. Since the netmask is just a series of 1 followed by a series of 0, couldn’t be easier to just tell how many ones we have in the subnet mask? Fortunately, to represent the combination of IP address plus subnet mask in a more human-readable fashion, we have the CIDR notation. To represent a subnet mask, we generally use the same dotted notation as the IP address, but this does not only take time to write, it is also hard to read (you have to skim on 4 bits of IP address plus 4 bytes of netmasks). If you overlay that IP address with the subnet mask, the Network ID portion correspond to the 1 portion of the subnet mask, while the Host ID portion corresponds to the 0 portion. To be even more specific, the netmask is 32-bits long just as the IP address, and it always comes with a related IP address. A subnet mask, known also as netmask, is just a series of ones and zeroes that defines where the Network ID portion of the related IP addresses ends in favor of the Host ID portion. We already know from the previous article about IPv4 that the classful addressing scheme is now considered legacy and that it has been replaced by classless addressing, which relies on subnet masks. So, let’s get started to dive into IPv4 subnetting. After this article, you will be ready to prepare your own IP addressing plan for your own network. ![]() In this article, we will talk about subnetting with IPv4, the networking discipline that defines the size of subnets, how many hosts they can support, and how they should be positioned in the global network. ![]() We know how IP addresses work, and we know that if a device has an IP address instead of another is probably because someone decided that. In the previous article of the CCNA Course series, we talked about IPv4 addressing. ![]()
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