At which Layer would you troubleshoot a cabling issue?

The correct answer is A. Layer 1. Layer 1 (Physical) is where cabling issues live - it governs the physical transmission of raw bits over media, including cables, connectors, voltages, and signal standards. If a cable is cut, unplugged, or the wrong type, that's a Physical layer problem. Layer 2 (Data Link) is…

Install and Maintain Industrial Network Components

Question

Options

ALayer 1
BLayer 2
CLayer 3
DLayer 4

How the community answered

(62 responses)

A
89% (55)
B
2% (1)
C
6% (4)
D
3% (2)

Explanation

Layer 1 (Physical) is where cabling issues live - it governs the physical transmission of raw bits over media, including cables, connectors, voltages, and signal standards. If a cable is cut, unplugged, or the wrong type, that's a Physical layer problem.

Layer 2 (Data Link) is wrong because it handles framing, MAC addressing, and error detection - it assumes a working physical connection already exists.
Layer 3 (Network) is wrong because it deals with logical addressing and routing (IP), not physical media.
Layer 4 (Transport) is wrong because it manages end-to-end communication, flow control, and reliability (TCP/UDP) - far above anything physical.

Memory tip: Think "Layer 1 = real-world stuff you can touch." If you can hold it, plug it, or trip over it, troubleshoot it at Layer 1.

Topics

#OSI Model#Physical Layer#Cabling#Network Troubleshooting

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