2.5 – What is CIDR

Question 1

CIDR

Answer 1

Classless Inter Domain Router
o 192.168.30.4 / 24
o 24 = CIDR Notation
–Represents the Subnet Mask

Question 2

How to read CIDR

Answer 2

o 255.255.255.0 = 24
—Class C Subnet Mask

o /24 = the number of bits: 24 bits
o 255 = 11111111 [8 bits]

255. 255. 255. 0
               8 bits 8 bits 8 bits 0 bits =24 bits

Question 3

CIDR: Class A

Answer 3

255.0.0.0 /8

Question 4

CIDR: Class B

Answer 4

255.255.0.0 /16

Question 5

CIDR: Class C

Answer 5

255.255.255.0 /24