What is the default subnet mask for Class B networks?

Study for the Internet Protocol Version 4 Test. Use flashcards and multiple-choice questions, each with hints and explanations. Master the exam with confidence!

Multiple Choice

What is the default subnet mask for Class B networks?

Explanation:
In Classful IPv4 addressing, the default subnet mask depends on the first octet of the address. For Class B networks, the first octet ranges from 128 to 191, so the network portion uses the first two octets. The default subnet mask is 255.255.0.0 (also written as /16), meaning the first two octets identify the network and the last two identify hosts within that network. The other options don’t fit: 255.0.0.0 is Class A’s default mask, 255.255.255.0 is Class C’s default mask, and 255.255.255.255 is the broadcast address, not a subnet mask.

In Classful IPv4 addressing, the default subnet mask depends on the first octet of the address. For Class B networks, the first octet ranges from 128 to 191, so the network portion uses the first two octets. The default subnet mask is 255.255.0.0 (also written as /16), meaning the first two octets identify the network and the last two identify hosts within that network. The other options don’t fit: 255.0.0.0 is Class A’s default mask, 255.255.255.0 is Class C’s default mask, and 255.255.255.255 is the broadcast address, not a subnet mask.

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