Which network device operates at both physical and data link layers? MCQ with Answer and Explanation

Question
Which network device operates at both physical and data link layers?
A. Switch
B. Router
C. Gateway
D. Hub
Answer: Option A
Solution (By JKSSB Mock Tests)
Switches operate at layer 2 (data link) and have physical layer capabilities for receiving/transmitting signals.
This question belongs to: Computer Computer Networking
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Question #1
Which device is used to connect multiple network segments and reduce collision domains?
A. Hub
B. Repeater
C. Switch
D. Modem
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Correct Answer: Option C

Explanation:
A switch isolates each port into a separate collision domain, reducing collisions.
This question belongs to: Computer Computer Networking
Question #2
Which address block represents the standard 32-bit IPv4 multicast address group space under traditional classful sorting hierarchies?
A. 0.0.0.0 to 127.255.255.255
B. 192.168.0.0 to 192.168.255.255
C. 224.0.0.0 to 239.255.255.255
D. 240.0.0.0 to 255.255.255.255
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Correct Answer: Option C

Explanation:
Class D addresses (224.0.0.0 to 239.255.255.255) are reserved globally for multicast traffic targeting specific groups of devices.
This question belongs to: Computer Computer Networking
Question #3
What is the purpose of a cable tester in networking?
A. To connect networks
B. To measure network speed
C. To assign IP addresses
D. To verify cable continuity and wiring
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Correct Answer: Option D

Explanation:
Cable testers check for opens, shorts, and proper pinouts in network cables.
This question belongs to: Computer Computer Networking
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