What is the subnet mask for a Class B network? MCQ with Answer and Explanation

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What is the subnet mask for a Class B network?

A. 255.0.0.0

B. 255.255.0.0

C. 255.255.255.0

D. 255.255.255.255

Answer: Option B

Solution (By JKSSB Mock Tests)

Class B default subnet mask is 255.255.0.0 (16 bits for network).

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Question #1

Which class of IP address is used for multicast?

A. Class A

B. Class D

C. Class C

D. Class B

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Correct Answer: Option B

Explanation:
Class D (224.0.0.0 to 239.255.255.255) is reserved for multicast groups.

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Question #2

What happens if a terminator component is missing from either end of a traditional coaxial Bus Network line?

A. The system re-routes all traffic to the loopback interface.

B. Signals reflect back along the cable when they hit the open end, causing signal corruption that drops the network.

C. The network transitions to a wireless ring structure.

D. The data frame sizes double automatically.

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Correct Answer: Option B

Explanation:
Without a terminator to absorb signals at the physical endpoints of a bus network, signal bounce corrupts ongoing data traffic.

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Question #3

Which of the following topologies is most expensive to implement due to cabling?

A. Star

B. Mesh

C. Bus

D. Ring

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Correct Answer: Option B

Explanation:
Mesh topology requires a dedicated connection between every pair of nodes, making it the most expensive.

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