Question

A user calls to report that he is experiencing periodic problems connecting to the network. Upon investigation, you find that the cable connecting the user's PC to the switch is close to a fluorescent light fitting. What condition is most likely causing the problem? A. Crosstalk B. EMI C. Attenuation D. Faulty cable 

   A user calls to report that he is experiencing periodic problems connecting to the network. Upon investigation, you find that the cable connecting the user's PC to the switch is close to a fluorescent light fitting. What condition is most likely causing the problem?
A. Crosstalk
B. EMI
C. Attenuation
D. Faulty cable
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CompTIA Network+ N10-004 Exam Cram
CompTIA Network+ N10-004 Exam Cram
Mike Harwood 3rd Edition
Chapter 2, Problem 8 ↓

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Step 1: Identify the problem as electromagnetic interference (EMI) caused by the proximity of the cable to the fluorescent light fitting.  Show more…

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A user calls to report that he is experiencing periodic problems connecting to the network. Upon investigation, you find that the cable connecting the user's PC to the switch is close to a fluorescent light fitting. What condition is most likely causing the problem? A. Crosstalk B. EMI C. Attenuation D. Faulty cable
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Key Concepts

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Electromagnetic Interference (EMI)
EMI is the disturbance generated by external electromagnetic sources that disrupts the normal operation of electrical circuits. In networking, EMI can be induced by devices such as fluorescent light fittings, motors, or radio frequency transmissions, leading to corrupted data signals and intermittent connectivity issues on cables that are insufficiently shielded.
Signal Integrity
Signal integrity refers to the maintenance of the quality and reliability of electrical signals as they travel through a transmission medium. In network cabling, factors such as EMI, improper grounding, or insufficient shielding can degrade signal integrity, resulting in data errors and connectivity problems. Ensuring proper cable design and installation helps preserve the strength and clarity of transmitted signals.
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One way to avoid EMI problems is to _____. Select one: a. run low-voltage cable close to power cables b. use fluorescent lights c. use ungrounded metal pathways d. terminate unused conductors at both ends
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