What is the purpose of a subnet mask in TCP/IP networking?
2024
What is the purpose of a subnet mask in TCP/IP networking?
- A.
To identify the network portion of an IP address
- B.
To identify the host portion of an IP address
- C.
To convert IP addresses into domain names
- D.
More than one of the above
- E.
None of the above
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Correct answer: D
A subnet mask is used in TCP/IP networking to divide an IP address into two parts: the network portion and the host portion. It uses a 32-bit pattern of 1s and 0s, where 1s represent the network part and 0s represent the host part. This helps routers and devices determine whether a destination IP address is on the same local network or needs to be routed to another network. For example, in the IP address 192.168.1.10 with a subnet mask 255.255.255.0, the first three octets (192.168.1) represent the network, and the last octet (10) represents the host.