Which statement about a subnet mask is false?

Which statement about a subnet mask is false?

• A. Bits set to 1 indicate the network portion.
• B. Bits set to 0 indicate the host portion.
• C. A subnet mask is used with an IP to perform a bitwise AND operation.
• D. Bits set to 1 indicate the host portion.

Answer: (D)

Subnet masks designate which part of an IP address is the network versus the host. The bits set to 1 in a subnet mask identify the network portion, while bits set to 0 identify the host portion. When you apply a mask to an IP address with a bitwise AND, you get the network address. So saying that bits set to 1 indicate the host portion is false. For example, 192.168.1.10 with a 255.255.255.0 mask yields the network address 192.168.1.0, and the host portion is 10. The other statements align with this behavior: 1s denote the network part, 0s denote the host part, and the mask is used with a bitwise AND to derive the network address.

Subnet masks designate which part of an IP address is the network versus the host. The bits set to 1 in a subnet mask identify the network portion, while bits set to 0 identify the host portion. When you apply a mask to an IP address with a bitwise AND, you get the network address. So saying that bits set to 1 indicate the host portion is false. For example, 192.168.1.10 with a 255.255.255.0 mask yields the network address 192.168.1.0, and the host portion is 10. The other statements align with this behavior: 1s denote the network part, 0s denote the host part, and the mask is used with a bitwise AND to derive the network address.