Analyzing Classful IPv4 Networks

Question 1

What is a Class A?

Answer 1

Frst Octet 1-126
Purpose Unicast (large networks)

Question 2

What is a Class B?

Answer 2

Frst Octet 128-191
Purpose Unicast (medium sized networks)

Question 3

What is a Class C?

Answer 3

Frst Octet 192-223
Purpose Unicast (small networks)

Question 4

What is a Class D?

Answer 4

Frst Octet 224-239

Purpose Multicast

Question 5

What is a Class E?

Answer 5

Frst Octet 240-255

Purpose Experimental

Question 6

True or False

The addresses in the same network have the same values in the network part.

Answer 6

True

Question 7

True or False

The address in the same network have different values in the host part.

Answer 7

True

Question 8

What is the formula to calculate the number of host addresses per Class A, B, or C network?

Answer 8

2^H -2

Where H is the number of Host bits

Question 9

What are valid network numbers for Class A

Answer 9

1.0.0.0 - 126.0.0.0

Question 10

What are valid network numbers for Class B

Answer 10

128.0.0.0 - 191.255.0.0

Question 11

What are valid network numbers for Class C

Answer 11

192.0.0.0 - 223.255.255.0

Question 12

How many total networks does a Class A have?

Answer 12

2^7-2 = 126

Question 13

How many total networks does a Class B have?

Answer 13

2^14 = 16,384

Question 14

How many total networks does a Class C have?

Answer 14

2^21 = 2,097,152

Question 15

How many hosts does a Class A network have?

Answer 15

2^24 -2

Question 16

How many hosts does a Class B network have?

Answer 16

2^16 -2

Question 17

How many hosts does a Class C network have?

Answer 17

2^8 - 2

Question 18

What is the default mask for a Class A?

Answer 18

255.0.0.0

Question 19

What is the default mask for a Class B?

Answer 19

255.255.0.0

Question 20

What is the default mask for a Class C?

Answer 20

255.255.0.0

Question 21

Which of the following are not valid Class A network IDs? (choose two)

a. 1.0.0.0
b. 130.0.0.0
c. 127.0.0.0
d. 9.0.0.0

Answer 21

b. 130.0.0.0

c. 127.0.0.0

Question 22

Which of the following are not valid Class B network IDs?

a. 130.0.0.0
b. 191.255.0.0
c. 128.0.0.0
d. 150.255.0.0
e. All are valid class B network IDs

Answer 22

e. All are valid class B network IDs

Question 23

Which of the following are true about IP address 172.16.99.45’s IP network? (select two)

a. The network ID is 172.0.0.0
b. The network is a Class B network
c. The default mask for the network is 255.255.255.0
d. The number of host bits in the unsubnetted network is 16

Answer 23

b. The network is a Class B network

d. The number of host bits in the unsubnetted network is 16

Question 24

Which of the following are true about IP address 192.168.6.7’s IP networks? (select two)

a. The network ID is 192.168.6.0
b. The network is a Class B network
c. The default mask for the network is 255.255.255.0
d. The number of host bits in the unsubnetted network is 16

Answer 24

a. The network ID is 192.168.6.0

c. The default mask for the network is 255.255.255.0

Question 25

Which of the following is a network broadcast address?

a. 10.1.255.255
b. 192.168.255.1
c. 224.1.1.255
d. 172.30.255.255

Answer 25

d. 172.30.255.255

Question 26

Which of the following is a Class A, B, or C network ID?

a. 10.1.0.0
b. 192.168.1.0
c. 127.0.0.0
d. 172.20.0.1

Answer 26

b. 192.168.1.0