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 routing tables

B. Stores IP address mappings

C. Stores recently resolved domain names for faster lookup

D. Stores MAC addresses

Answer: Option C

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

A. 192.168.1.50

B. 172.32.1.1

C. 200.200.200.200

D. 8.8.4.4

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Correct Answer: Option A

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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Question #2

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Which IP address range specifies a Class C network identity under traditional classful routing protocols?

A. 128.0.0.0 to 191.255.255.255

B. 192.0.0.0 to 223.255.255.255

C. 1.0.0.0 to 126.255.255.255

D. 224.0.0.0 to 239.255.255.255

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Correct Answer: Option B

Explanation:
Class C IP addresses use a first octet range from 192 to 223, commonly allocated for small-to-medium local networks.

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Question #3

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What notation standard is used to write and display modern 128-bit IPv6 address configurations readably?

A. Dotted decimal fields

B. Eight groups of four hexadecimal digits separated by colons

C. Binary bitstream flags

D. Base-64 character strings

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Correct Answer: Option B

Explanation:
IPv6 addresses are formatted as eight groups of four hexadecimal digits separated by colons (e.g., 2001:0db8:0000:0000:0000:ff00:0042:8329).

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