1. Which two statements are correct about an IPv4 address? (Choose two.)

• It contains a network portion.
• It contains a host portion.
• It is 24 bits in length.
• The information within the IPv4 address is sufficient for determining the network portion and host portion of the address.

Explanation: An IPv4 address is 32 bits in length. It contains both a network and a host portion.

2. Which two statements are correct about an IPv4 subnet mask? (Choose two.)

• It is 24 bits in length.
• It differentiates the network portion from the host portion of an IPv4 address.
• It is any combination of 0 and 1 bits.
• It is a consecutive sequence of 0 bits followed by a consecutive sequence of 1 bits.
• The 1 bits determine the network portion of an IPv4 address, and the 0 bits determine the host portion.

Explanation: A subnet mask is 32 bits in length. It differentiates the network portion from the host portion of an IPv4 address. It is a consecutive series of 1 bits followed by consecutive 0 bits. The 1 bits indicate the network portion of the IPv4 address, and the 0 bits indicate the host portion.

3. Which three statements are correct about the AND operation? (Choose three.)

• The AND operation is performed between an IPv4 address and subnet mask.
• The AND operation is performed between two IPv4 addresses.
• 1 AND 1 results in a 0
• 1 AND 0 results in a 0
• It is used to determine the network and host portions of an IPv4 address.

Explanation: The AND operation is used between the IPv4 address and subnet mask to determine the network portion of the address. 1 AND 1 results in a 1, any other combination results in a 0.

4. What is the result of a logical AND operation of: 10.128.17.4 255.255.240.0?

• The IPv4 network address of 10.128.0.0 255.255.240.0
• The IPv4 network address of 10.128.16.0 255.255.240.0
• The IPv4 network address of 10.128.17.0 255.255.240.0
• The IPv4 network address of 10.128.17.4 255.255.240.0

Explanation: The result of a logical AND operation of 10.128.17.4 255.255.240.0 produces the IPv4 network address 10.128.16.0 255.255.240.0.