What does the term packet refer to in networking? MCQ with Answer and Explanation

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What does the term packet refer to in networking?

A. A unit of data at the application layer

B. A unit of data at the physical layer

C. A unit of data at the network layer

D. A unit of data at the data link layer

Answer: Option C

Solution (By JKSSB Mock Tests)

A packet is a formatted unit of data at the network layer (layer 3).

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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. Data link layer

B. Network layer

C. Transport layer

D. Session 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 maximum number of subnets available in a Class C network with a /27 subnet mask?

A. 8

B. 4

C. 32

D. 16

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Correct Answer: Option A

Explanation:
Class C default /24, /27 borrows 3 bits, giving 2^3 = 8 subnets.

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Question #3

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Which protocol is used to retrieve email from a server?

A. SMTP

B. POP3

C. FTP

D. HTTP

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Correct Answer: Option B

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

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