Which device connects a network to the Internet and often includes firewall functionality? MCQ with Answer and Explanation

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Which device connects a network to the Internet and often includes firewall functionality?

A. Switch

B. Hub

C. Bridge

D. Router

Answer: Option D

Solution (By JKSSB Mock Tests)

A router often connects a local network to the internet and may include security features like firewalls.

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Question #1

Which of the following is a port used by DNS?

A. 53

B. 25

C. 443

D. 80

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Correct Answer: Option A

Explanation:
DNS uses port 53 (both TCP and UDP).

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Question #2

Which of the following is an advantage of a switch over a hub?

A. Intelligence to send data only to the destination port

B. Works over longer distances

C. Supports more protocols

D. Lower cost

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Correct Answer: Option A

Explanation:
Switches learn MAC addresses and forward frames only to the intended port, reducing unnecessary traffic.

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Question #3

Which protocol is used for remote terminal access?

A. SMTP

B. SSH

C. HTTP

D. FTP

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Correct Answer: Option B

Explanation:
SSH (Secure Shell) provides secure remote terminal access and command execution.

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