In which topology is it possible to add or remove devices without disrupting the entire network? MCQ with Answer and Explanation

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In which topology is it possible to add or remove devices without disrupting the entire network?

A. Ring

B. Mesh

C. Star

D. Bus

Answer: Option C

Solution (By JKSSB Mock Tests)

In star topology, each device is independently connected to the central hub, so adding/removing doesn't affect others.

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Question #1

Which protocol is used to retrieve email from a server?

A. HTTP

B. FTP

C. POP3

D. SMTP

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Correct Answer: Option C

Explanation:
POP3 (Post Office Protocol) is used to download email from a server to a client.

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Question #2

Which network topology is most resistant to cable failure?

A. Mesh

B. Ring

C. Bus

D. Star

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Correct Answer: Option A

Explanation:
Mesh provides multiple redundant paths, so a single cable failure does not disconnect the network.

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Question #3

Which OSI layer is responsible for error detection and correction at the data link layer?

A. Physical layer

B. Network layer

C. Data link layer

D. Transport layer

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Correct Answer: Option C

Explanation:
The data link layer performs error detection (and sometimes correction) using frame check sequences.

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