In $1993,$ the IETF $($Internet Engineering Task Force$)$ devised a shorthand method for identifying

network and host bits in an IP address. What is this method, and how is it used?

a$.$ The method is known as CIDR $($Classless Interdomain Routing$)$ notation, or slash notation.

CIDR notation takes the network ID or a host's IP address and follows it with a forward

slash $(),$ which is then followed by the number of bits that are used for the network ID$.$

b$.$ The method is known as CIDR $($Classful Interdomain Routing$)$ notation, or slash notation.

CIDR notation takes the host ID or a host's IP address and follows it with a forward slash

$(),$ which is then followed by the number of bits that are used for the host ID$.$

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