Class Inter-Domain Routing (CIDR) Flashcards

Know the / notation

1
Q

/25

A

■ 128 mask
■ 1 bit on and 7 bits off (10000000)
■ Block size of 128
■ 2 subnets, each with 126 hosts

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2
Q

/26

A

■ 192 mask
■ 2 bits on and 6 bits off (11000000)
■ Block size of 64
■ 4 subnets, each with 62 hosts

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3
Q

/27

A

■ 224 mask
■ 3 bits on and 5 bits off (11100000)
■ Block size of 32
■ 8 subnets, each with 30 hosts

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4
Q

/28

A

■ 240 mask
■ 4 bits on and 4 bits off (11110000)
■ Block size of 16
■ 16 subnets, each with 14 hosts

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5
Q

/29

A

■ 248 mask
■ 5 bits on and 3 bits off (11111000)
■ Block size of 8
■ 32 subnets, each with 6 hosts

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6
Q

/30

A

■ 252 mask
■ 6 bits on and 2 bits off (11111100)
■ Block size of 4
■ 64 subnets, each with 2 hosts

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