FIGURE 4.6 CIDR in operation. Basically, supernetting moves the natural mask to the left while subnetting moves it to the right. The /31 Prefix In many cases, a /31 prefix that allows only two IPv4 ...

IPv4 subnetting causes routing tables to contain smaller and smaller subnets and increase memory and CPU requirements on backbone routers and even enterprise routers (for multi-homed companies).

To subnet properly there are topics you need a basic understanding of: binary (base-2) numbers, and classful networks. The idea with classful networks is essentially that IPv4 addresses are broken ...

IPv4 SUBNETTING BASICS Before talking IPv4 subnetting, let me mention that there are two IP addressing schemes. IPv4 uses the dotted decimal notations we have been talking about, while IPv6 uses an ...

These two pieces of information are the default gateway/router address, and how many bits are part of the network prefix (the equivalent of the IPv4 subnet mask). There is a third bit of crucial ...

In the following discussions, the examples used are chosen for their simplicity, not for completeness. Subnetting in IPv4 The IP address space was originally classful. (Of course, they didn't know it ...

This command displays all network interfaces and their configurations, including IP addresses, subnet masks and default gateway. IPv4 (version 4) addresses are formatted in a "dotted-decimal octet ...

For the foreseeable future, IPv4 will co-exist with the newer IPv6 version (see IPv6). IPv4 uses a "dotted decimal" address that comprises four sets of numbers separated by decimal points ...

The loopback address is usually expressed as ::1. 6: You don’t need a traditional subnet mask In IPv4, every IP address comes with a corresponding subnet mask. IPv6 also uses subnets ...

This will be very useful as we proceed. MORE IPv4 SUBNETTING BASICS Consider an analog clock. Start the second hand at 12:00 and follow it clockwise around the dial. At 12:00, 60 seconds have passed.