What does a modem do? MCQ with Answer and Explanation

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What does a modem do?

A. Assigns IP addresses

B. Amplifies signals

C. Connects a LAN to a WAN by converting digital signals to analog and vice versa

D. Filters network traffic

Answer: Option C

Solution (By JKSSB Mock Tests)

A modem (modulator-demodulator) converts digital data from a computer to analog for transmission over telephone lines and vice versa.

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Question #1

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Which layer of the OSI model is responsible for end-to-end error recovery and flow control?

A. Network layer

B. Session layer

C. Transport layer

D. Data link layer

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Correct Answer: Option C

Explanation:
The transport layer (e.g., TCP) provides reliable data transfer, error recovery, and flow control.

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Question #2

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What is the default subnet mask for a Class C IP address?

A. 255.255.0.0

B. 255.255.255.0

C. 255.255.255.255

D. 255.0.0.0

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Correct Answer: Option B

Explanation:
Class C has a default subnet mask of 255.255.255.0, providing up to 254 hosts.

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Question #3

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What does the acronym NAT stand for?

A. Network Address Tracking

B. Node Address Translation

C. Network Access Translation

D. Network Address Translation

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Correct Answer: Option D

Explanation:
NAT maps private IP addresses to a public IP for internet access.

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