What is a frame in networking? MCQ with Answer and Explanation

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What is a frame in networking?

A. Data unit at the transport layer

B. Data unit at the network layer

C. Data unit at the application layer

D. Data unit at the data link layer

Answer: Option D

Solution (By JKSSB Mock Tests)

A frame is the layer 2 PDU (Protocol Data Unit), encapsulating the packet with MAC addresses.

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Question #1

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What is the main difference between a router and a switch?

A. Router forwards based on MAC; switch forwards based on IP

B. Router operates at layer 2; switch at layer 3

C. Router forwards based on IP; switch forwards based on MAC

D. No difference

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Correct Answer: Option C

Explanation:
Routers use IP addresses (layer 3), switches use MAC addresses (layer 2).

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Question #2

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Which of the following is not a network topology?

A. Mesh

B. Switch

C. Star

D. Ring

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Correct Answer: Option B

Explanation:
Switch is a device, not a topology. Topologies include star, ring, bus, mesh, etc.

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Question #3

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Which address is used by an operating system to send a packet to all host devices residing on the local subnet simultaneously?

A. MAC Identifier

B. Broadcast Address

C. Gateway Address

D. Loopback Address

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Correct Answer: Option B

Explanation:
The broadcast address (such as 255.255.255.255 publicly or the last address of a subnet) allows data to target all nodes on that network block.

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