Troubleshooting

Question 1

Attenuation tools:
(Loss of signal)

Answer 1

Cable certifier
Fiber light meter

Question 2

Interference tool:

Answer 2

Spectrum analyzer

Question 3

dB loss tools:

Answer 3

Cable certifier / cable analyzer
Fiber light meter

Question 4

Physical attenuation is_______ and is caused by_______

Answer 4

Weakened signal

Cable too long, temp,
dirty fiber connectors

Question 5

dB loss is _______ and is caused by______

Answer 5

A voltage or light loss

Shitty cables or dirty ends

Question 6

Incorrect Pin outs can occur at _______ and are tested with______

Answer 6

Wall jack, patch panel, rj45

Cable tester / Cable certifier / Wire map

Question 7

Bad ports are tested with

Answer 7

A loopback plug

Question 8

Open or short can be tested with

Answer 8

Cable tester / cable certifier / wire map

Question 9

3 Fiber issues

Answer 9

Wrong transceiver
Transmit (tx) and receiver (rx) switched
Dirty cables

Question 10

3 LED link status

Answer 10

Light off = no link
On = link
Blink = data flow

Question 11

3 LED speed indications

Answer 11

Green = 1G
Orange = 100Mbps
Off = 10Mbps

Question 12

High packet loss is an indication of

Answer 12

Duplex mismatch

Make sure both devices are set to auto negotiate

Question 13

Span of a fiber cable can be tested with

Answer 13

OTDR

Optical time domain reflectometer

Or

Fiber light meter

Question 14

Channel utilization should be kept under

Answer 14

30%

Question 15

Poor RSSi can be caused by

Answer 15

Polarization

Most devices use vertical polarization, but some are horizontal

Question 16

How to solve channel over utilization

Answer 16

Start with a site survey

Switch to a different channel such as using 5Ghz

Question 17

To combat a weak signal you can use

Answer 17

Signal booster
Larger antenna
Wireless repeater
Second access point

Question 18

Incorrect password wireless solution

Answer 18

Check password

Reinstall drivers for wireless adapter

Question 19

Wireless encryption by version

Answer 19

WEP rc4
Wpa tkip
WPA2 aes

Sometimes you need to reinstall drivers

Question 20

3 step to solve Captive portal issues

Answer 20

Manually navigate to a website

Try the ip address of the default gateway

Check the DNS settings and make sure they are set to auto

Question 21

Captive portals utilize 802.1x and use ______ for authentication

Answer 21

RADIUS

Question 22

WiFi coverage is affected by_____

Answer 22

Building materials

Question 23

What tool is used to test throughput

Answer 23

IPerf

Question 24

Split horizon prevents

Answer 24

Routing loops

Question 25

TFTP is commonly used for

Answer 25

Bootloading

Question 26

Indicators of collisions

Answer 26

Show interface cmd
Slow throughput

Question 27

Indicators of broadcast storms

Answer 27

Packet capture
Waaay too many packets

Question 28

Collision solutions

Answer 28

Turn off auto negotiate
Hard code lower speed
Change to half duplex

Question 29

Brodcast storm solutions

Answer 29

Too large of a broadcast domain
Subnet and connect domains with later 3 devices

Loops enable BPDU
Limit MAC addresses per port