Which of the following is a well-known port for FTP data transfer? MCQ with Answer and Explanation

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Which of the following is a well-known port for FTP data transfer?

A. 20

B. 22

C. 23

D. 21

Answer: Option A

Solution (By JKSSB Mock Tests)

FTP uses port 20 for data transfer and port 21 for control.

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Question #1

What is the primary function of a switch's MAC address table?

A. To store mappings between MAC addresses and ports

B. To store domain names

C. To store IP addresses

D. To store routing information

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Correct Answer: Option A

Explanation:
A switch's MAC address table learns which MAC address is associated with which port for efficient forwarding.

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Question #2

What is the role of a firewall in a network?

A. To protect against unauthorized access

B. To boost signal

C. To assign IP addresses

D. To route packets

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Correct Answer: Option A

Explanation:
Firewalls enforce security policies by blocking unauthorized traffic.

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Question #3

What is the role of a network interface card (NIC)?

A. Assigns IP addresses

B. Routes packets between networks

C. Filters traffic

D. Provides physical connection to the network

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Correct Answer: Option D

Explanation:
A NIC is hardware that connects a computer to a network media.

This question belongs to: Computer Computer Networking

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