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IT Interview Questions:What is CIDR?
Information Technology (IT) Interview Questions and Answers
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IT Interview Questions:What is CIDR?
Short for
C
lassless
I
nter-
D
omain
R
outing,
an IP addressing scheme that
replaces the older system based on classes A, B, and C. With CIDR, a single
IP address can be used to designate many unique IP addresses. A CIDR IP
address looks like a normal IP address except that it ends with a slash
followed by a number, called the
IP network prefix.
For example:
172.200.0.0/16 The IP network prefix specifies how many addresses are covered
by the CIDR address, with lower numbers covering more addresses. An IP
network prefix of
/12,
for example, can be used to address 1,048,576 former
Class C addresses. CIDR addresses reduce the size of routing tables and make
more IP addresses available within organizations. CIDR is also called
supernetting
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