What is the role of a DNS resolver? MCQ with Answer and Explanation

Question

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What is the role of a DNS resolver?

A. To filter traffic

B. To query DNS servers for domain name resolution

C. To assign IP addresses

D. To forward packets

Answer: Option B

Solution (By JKSSB Mock Tests)

A DNS resolver is a client that initiates queries to DNS servers to translate domain names.

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Question #1

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What is the primary benefit of upgrading a legacy hub-driven network to a modern network switch infrastructure?

A. It decreases the maximum physical cable length limits.

B. It removes the requirement for IP addressing rules.

C. It forces the network to run over analog modems.

D. It eliminates collisions by creating dedicated collision domains for each connected port.

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Correct Answer: Option D

Explanation:
Switches separate each port into its own collision domain. This eliminates collision risks, allowing for full-duplex data transfers.

This question belongs to: Computer Computer Networking

Question #2

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Which device is responsible for modulating digital computer signals into analog waves for transmission over traditional telephone lines, and demodulating them back?

A. Router

B. Bridge

C. Modem

D. Gateway

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Correct Answer: Option C

Explanation:
A modem (Modulator-Demodulator) converts digital signals from a computer into analog signals for communication cables, and vice versa.

This question belongs to: Computer Computer Networking