What is a subnet? MCQ with Answer and Explanation

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What is a subnet?

A. A VLAN

B. A physical network segment

C. A logical subdivision of an IP network

D. A type of router

Answer: Option C

Solution (By JKSSB Mock Tests)

Subnetting divides a large network into smaller logical subnetworks.

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Question #1

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Which topology uses a single communication line to which all devices are attached?

A. Bus

B. Star

C. Ring

D. Mesh

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Correct Answer: Option A

Explanation:
Bus topology uses a single cable (backbone) to which all devices connect.

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Question #2

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Which of the following is a port used by DNS?

A. 53

B. 25

C. 443

D. 80

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Correct Answer: Option A

Explanation:
DNS uses port 53 (both TCP and UDP).

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Question #3

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What is the function of a DNS cache?

A. Stores routing tables

B. Stores recently resolved domain names for faster lookup

C. Stores IP address mappings

D. Stores MAC addresses

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Correct Answer: Option B

Explanation:
DNS caching speeds up resolution by storing previous queries.

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