What is the function of a DNS cache? MCQ with Answer and Explanation

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What is the function of a DNS cache?

A. Stores MAC addresses

B. Stores recently resolved domain names for faster lookup

C. Stores routing tables

D. Stores IP address mappings

Answer: Option B

Solution (By JKSSB Mock Tests)

DNS caching speeds up resolution by storing previous queries.

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Question #1

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Which device functions exclusively at the physical layer of the OSI model to amplify or regenerate weak electrical or optical network signals over extended distances?

A. Gateway

B. Bridge

C. Repeater

D. Router

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Correct Answer: Option C

Explanation:
A repeater acts at Layer 1 to boost incoming electrical or optical signals, counteracting signal attenuation across long cable runs.

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Question #2

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Which device connects different networks and forwards data packets based on IP addresses?

A. Hub

B. Modem

C. Switch

D. Router

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Correct Answer: Option D

Explanation:
A router operates at the network layer and routes packets between different networks using IP addresses.

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Question #3

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Which of the following is an IP address reserved exclusively for use within private internal networks?

A. 8.8.4.4

B. 200.200.200.200

C. 172.32.1.1

D. 192.168.1.50

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Correct Answer: Option D

Explanation:
The 192.168.0.0 to 192.168.255.255 range is defined by RFC 1918 as a private Class C IP block reserved for internal networks.

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