At which layer of the OSI model does a hub operate? MCQ with Answer and Explanation

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

A. Data link layer

B. Physical layer

C. Application layer

D. Network layer

Answer: Option B

Solution (By JKSSB Mock Tests)

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

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Question #1

Which IP address class has the first bit as 0?

A. Class B

B. Class D

C. Class A

D. Class C

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Correct Answer: Option C

Explanation:
Class A addresses have the first bit as 0, ranging from 0.0.0.0 to 127.255.255.255.

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Question #2

Which type of network connection allows communication to flow in both directions at the same time (e.g., a standard cellular phone conversation)?

A. Simplex

B. Half-Duplex

C. Asynchronous

D. Full-Duplex

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Correct Answer: Option D

Explanation:
Full-duplex links support simultaneous bidirectional transmission, allowing devices to send and receive data at the same time.

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Question #3

Which of the following is a protocol used for secure communication over the internet?

A. FTP

B. Telnet

C. HTTP

D. HTTPS

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Correct Answer: Option D

Explanation:
HTTPS (HTTP Secure) uses SSL/TLS to encrypt data for secure communication.

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