Troubleshooting Common Cabling Problems Flashcards
What type of cable must be used for PoE with network devices?
a. Cat 5e or greater
b. Cat 3 or greater
c. Cat 5 or greater
d. Cat 4 or greater
Answer: a. In order to use PoE, your physical media must be Cat 5e or higher.
Which of the following can be a major issue for fiber-optic media?
a. Incorrect pin outs
b. Dirty optical media
c. EMI
d. dB loss
Answer: b. You need to ensure that you do not allow dirt to enter fiber-optic
cable or cable connectors.
What type of cable testing device permits a network device to communicate
with itself in order to test its ability to send and receive traffic?
a. Cable tester
b. Loopback plug
c. Cable crimper
d. Fusion splicer
e. Tone generator
Answer: b. Using a loopback plug is a simple method of testing a network
device’s ability to send and receive traffic.
Which types of cables would you install to meet most building codes today
and prevent fires and poisonous gases from spreading? (Choose two.)
a. UTP rated
b. Rollover rated
c. Plenum rated
d. Riser rated
Answer: c, d. To mitigate the concern of pumping poisonous gas throughout
a building’s heating, ventilation, and air-conditioning (HVAC) system, you can
use plenum-rated cabling. The outer insulation of a plenum twisted-pair cable
is fire retardant; in addition, some plenum cabling uses a fluorinated ethylene
polymer (FEP) or a low-smoke polyvinyl chloride (PVC) to minimize dangerous fumes. Cables that run through risers should also be fire-proof to prevent
flames from traveling up the cable.
Which of the following terms are directly related to the weakening or loss of a
signal as it travels farther down the network media? (Choose two.)
a. Attenuation
b. Throughput
c. OTDR
d. Interference
e. Decibel (dB) loss
Answer: a, e. Attenuation is the weakening of a signal with greater distance
between two devices on network media. Attenuation is measured in decibels
(dB). dB loss is also more prone to happen as the signal needs to go farther and
farther in the media.
You need to connect two older switches that do not have auto-MDIX ports.
What should you use?
a. Console cable
b. Crossover cable
c. PoE cable
d. Loopback adapter
Answer: b. Auto-MDIX technology on newer devices permits a port to adjust
to the type of cable that is connected. Before this technology existed, it was
necessary to use crossover cables to connect like devices. For example, connecting two switches required a crossover cable.
You have a link between two network interfaces (devices) that is operating
inefficiently. What would most likely be the cause of this problem?
a. Incorrect pinout
b. Bad ports
c. Duplex mismatch
d. Failed NIC
Answer: c. Duplex mismatches can cause links between devices to run inefficiently. A common scenario is one device operating in half-duplex while the
other operates in full-duplex. You can check this setting in Windows 10 for a
NIC, for example. Open Device Manager and right-click on the suspect network adapter. Select Properties and then Speed & Duplex and look at the
Value setting.
