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CCNA - Subnetting (IPv4) > Classful Addressing > Flashcards

Classful Addressing Flashcards

1
Q

IPv4 address is how many bits long?

A

32 bits

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2
Q

IPv4 address is how many octets long?

A

4 octets

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3
Q

IPv4 address is how many bytes long?

A

4 bytes (1 byte = 8 bits)

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4
Q

How long is the network portion for a Class A address?

A

1 octet (1 byte or 8 bits)

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5
Q

How long is the network portion for a Class B address?

A

2 octets (2 bytes or 16 bits)

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6
Q

How long is the network portion for a Class C address?

A

3 octets (3 bytes or 24 bits)

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7
Q

What is the leading bit(s) for a Class A address?

A

Leftmost bit is 0

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8
Q

What is the leading bit(s) for a Class B address?

A

Leftmost 2 bits are 10

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9
Q

What is the leading bit(s) for a Class C address?

A

Leftmost 3 bits are 110

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10
Q

How many Class A network addresses are there?

A

128
Calculation: 2**7 = 128
(Note: First bit unusable; Assuming that all-zero network is allowed)

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11
Q

How many Class A hosts addresses are there per network?

A

16,777,214

Calculation: (2**24) - 2 = 16,777,216 - 2 = 16,777,214

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12
Q

How many Class B network addresses are there?

A

16,384
Calculation: 2**14 =16,384
(Note: First two bits unusable; Assuming that all-zero network is allowed)

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13
Q

How many Class B hosts addresses are there per network?

A

65,534

Calculation: (2**16) - 2 = 65,536 - 2 = 65,534

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14
Q

How many Class C network addresses are there?

A

2,097,152
Calculation: 2**21 =2,097,152
(Note: First three bits unusable; Assuming that all-zero network is allowed)

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15
Q

How many Class C hosts addresses are there per network?

A

254

Calculation: (2**8) - 2 = 256 - 2 = 254

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16
Q

How many usable network bits in Class A?

A 
7 bits
(Note: 8 - 1 reserved bit = 7)
17
Q

How many usable network bits in Class B?

A 
14 bits 
(Note: 16 - 2 reserved bits = 14)
18
Q

How many usable network bits in Class C?

A 
21 bits
(Note: 24 - 3 reserved bits = 21)
19
Q

What is the network address range for Class A?

A

1.0.0.0 - 126.0.0.0

Note: 0.0.0.0 and 127.0.0.0 are reserved

20
Q

What is the network address range for Class B?

A

128.0.0.0 - 191.255.0.0

21
Q

What is the network address range for Class C?

A

192.0.0.0 - 223.255.255.0

22
Q

What is the private address range for Class A?

A

10.0.0.0 - 10.255.255.255

Note: 10.255.255.255 is a broadcast address

23
Q

What is the private address range for Class B?

A

172.16.0.0 - 172.31.255.255

Note: 172.31.255.255 is a broadcast address

24
Q

What is the private address range for Class C?

A

192.168.0.0 - 192.168.255.255

Note: 192.168.255.255 is a broadcast address

CCNA - Subnetting (IPv4) (6 decks)

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