One way of expressing the
IP address without having to spell out the subnet mask in octets of
255s and 0s. Instead, you can count the number of 1s in the subnet
mask and then represent the IP address and subnet mask with a slash
followed by the number of bits in the subnet mask, like:
192.168.2.200 / 16.
This notation is called
classless inter-domain routing ( CIDR, pronounced “cedar”)
notation. The IP address part is very straightforward. The /16 tells
you that this IP address has a subnet mask with the first 16 bits set
to 1. And 16 1s give you a subnet mask of 255.255.0.0.
CIDR notation is used to
simplify entries on routing tables and is the notation used by a
majority of backbone internet routers. It is also used to cut down on
the number of wasted IP addresses in the Class B address space. You
should know how to recognize the CIDR notation when you see it and to
convert the CIDR subnet mask notation into a decimal equivalent.
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