17_Classful Subnetting Quiz

Which of the following is not a class of IP subnet?

• Class D

• Class E

• Class F

• Class C

Answer explanation

Class F is not a class of IP subnet. Classes A, B, C, D, and E are the valid classes of IP subnets.

What is the default subnet mask for a class B IP address?

• 255.255.0.0

• 255.0.0.0

• 255.255.255.255

• 255.255.255.0

Answer explanation

The default subnet mask for a class B IP address is 255.255.0.0. This subnet mask allows for up to 65,534 hosts on the network.

How many different classes of IP subnets are there?

• Three

• Four

• Six

• Five

Answer explanation

There are five different classes of IP subnets: Class A, B, C, D, and E. Each class has a different range of IP addresses and subnet masks.

What is the network address for the IP address 10.74.222.11 with a class A subnet mask?

• 10.0.0.0

• 10.74.222.0

• 10.74.0.0

• 10.74.222.11

Answer explanation

For a class A subnet mask, the network address is determined by the first octet of the IP address. Therefore, the network address for 10.74.222.11 is 10.0.0.0.

Which class does the IP address 172.16.88.200 belong to?

• Class D

• Class C

• Class B

• Class A

Answer explanation

The IP address 172.16.88.200 belongs to Class B because the first octet falls within the range of 128-191, indicating Class B addressing.

What is the first usable host address for the IP address 192.168.4.77 with a class C subnet mask?

• 192.168.4.1

• 192.168.4.0

• 192.168.4.254

• 192.168.4.255

Answer explanation

The first usable host address for the IP address 192.168.4.77 with a class C subnet mask is 192.168.4.1, as it falls within the range of usable host addresses in the subnet.

How many bits are used to determine the class of an IP address?

• Eight

• Two

• Six

• Four

Answer explanation

The correct answer is Eight because the class of an IP address is determined by the first octet, which consists of 8 bits.

What is the broadcast address for the IP address 172.16.88.200 with a class B subnet mask?

• 172.16.255.255

• 172.16.88.255

• 172.16.0.0

• 172.16.88.200

Answer explanation

The broadcast address for the IP address 172.16.88.200 with a class B subnet mask is 172.16.255.255, as the last octet of the IP address is all ones in binary when applying the subnet mask.

In classful subnetting, what is the default subnet mask for a class C IP address?

• 255.255.255.0

• 255.255.0.0

• 255.0.0.0

• 255.255.255.255

Answer explanation

In classful subnetting, the default subnet mask for a class C IP address is 255.255.255.0, which allows for up to 254 hosts per subnet.

What is the last usable host address for the IP address 10.74.222.11 with a class A subnet mask?

• 10.74.222.10

• 10.74.222.0

• 10.74.222.254

• 10.0.0.0

Answer explanation

The last usable host address for the IP address 10.74.222.11 with a class A subnet mask is 10.74.222.254, as the last address in a subnet is reserved for broadcast, making 10.74.222.254 the highest usable host address.