Network Troubleshooting - Objective 5

Question 1

5 causes of signal loss/degradation in fiber

Answer 1

• SFP or GBIC damage
• Dirty connector
• Connection mismatch
• Too long a cable causing attenuation &/or dispersion
• Light leakage from exceeding the bend radius limit

Question 2

How to find an asymmetric route on your network

Answer 2

Use trace route and look for different paths in the different run-throughs

Question 3

Multimeter

Answer 3

A measuring instrument that can measure the voltage, resistance, and amperage of a cable or conduit

Question 4

Cable certifier

Answer 4

A tool used to test the continuity of a cable and verify that a cable meets its specifications such as the bandwidth, frequency, and length

Question 5

IP scanner

Answer 5

Used to monitor a network’s IP address space in real-time and identify any devices connected to the network. Essentially, the tool will send a ping to every IP on the network and then creates a report of which IP addresses sent a response.

Question 6

Protocol analyzer

Answer 6

Used to capture, monitor, and analyze data transmitted over a communication channel

Question 7

Optical link budget

Answer 7

A calculation that considers all the anticipated losses along the length of a fiber optic connection

Question 8

PoE power mode A

Answer 8

Power and data on the same wire pair

Question 9

PoE power mode B

Answer 9

Power on the spare wire pair

Question 10

PoE power mode 4-pair

Answer 10

Power on all 4 data wire pairs (common with gigabit Ethernet)

Question 11

IGMP

Answer 11

Internet Group Management Protocol

Used to intelligently forward multicasts to specific devices

Question 12

What do DHCP clients use ARP broadcasts for?

Answer 12

To check for duplicate IP addresses

Question 13

2 types of materials that commonly reflect cellular signals

Answer 13

Metal and glass

Question 14

What it means when a port scan of a server shows a “filtered” port

Answer 14

The network firewall is blocking the port