Which of the following is a port used by DNS? MCQ with Answer and Explanation

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Which of the following is a port used by DNS?

A. 80

B. 25

C. 443

D. 53

Answer: Option D

Solution (By JKSSB Mock Tests)

DNS uses port 53 (both TCP and UDP).

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Question #1

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At which layer of the OSI model does a hub operate?

A. Application layer

B. Network layer

C. Physical layer

D. Data link layer

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Correct Answer: Option C

Explanation:
A hub is a physical layer device that simply repeats signals to all ports without any intelligence.

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Question #2

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What is a default gateway in a network?

A. The primary DNS server

B. The device that routes traffic to other networks

C. The network switch

D. The DHCP server

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Correct Answer: Option B

Explanation:
The default gateway is a router that connects the local network to external networks.

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Question #3

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Which network topology is used in early Ethernet networks with coaxial cable?

A. Star

B. Mesh

C. Bus

D. Ring

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Correct Answer: Option C

Explanation:
Early Ethernet used a bus topology with coaxial cable (thicknet/thinnet).

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