Which network device operates at both physical and data link layers? MCQ with Answer and Explanation

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Which network device operates at both physical and data link layers?

A. Router

B. Hub

C. Gateway

D. Switch

Answer: Option D

Solution (By JKSSB Mock Tests)

Switches operate at layer 2 (data link) and have physical layer capabilities for receiving/transmitting signals.

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Question #1

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What default subnet mask is associated with Class B IP networks under traditional classful network addressing parameters?

A. 255.0.0.0

B. 255.255.0.0

C. 255.255.255.0

D. 255.255.255.255

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Correct Answer: Option B

Explanation:
Class B networks default to a 16-bit prefix length, which maps to a default subnet mask of 255.255.0.0.

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Question #2

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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 MAC addresses

D. Stores IP address mappings

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Correct Answer: Option B

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

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Question #3

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What is the maximum data rate of a standard Ethernet (10BASE-T) network?

A. 1 Gbps

B. 10 Gbps

C. 100 Mbps

D. 10 Mbps

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Correct Answer: Option D

Explanation:
10BASE-T offers 10 Mbps; it is the original Ethernet standard over twisted pair.

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