Chapter 19 - Supplement - Sheet1

Question 1

Crosstalk

Answer 1

Signal bleed between two adjacent wires carrying a current. Minimized by creating twisted pairs

Question 2

Near-End Crosstalk

Answer 2

AKA Nearing Crosstalk. Crosstalk originating at the connection from the physical medium to the sender

Question 3

Attenuation

Answer 3

AKA DB Loss. Degrading signal as it moves through the wire.

Question 4

Collissions

Answer 4

2 Devices try to communicate on the same physica segment at the same time.

Question 5

Short

Answer 5

AKA short circuit, shorts. When current flows through a different path within a circuit than it’s supposed ot. In networks, usually cuased by physical fault in a cable.

Question 6

Open Impedance Mismatch

Answer 6

AKA Echo. Tells you that the cable or wires connect to another cable and there is an impedance mistmach. When this happens, some of hte signal will bounce back in the direction it came from

Question 7

Split Pairs

Answer 7

Wiring error where two connections that are supposed to be connected using the two wires of a twisted pair are instead connected using two wires from different pairs.

Question 8

Common Issues with Unbound Media

Answer 8

(Wireless Issues) Interference, Configuration, Distacne/signal strength, Latency, Bounce, Incorrect antenna/switch placement

Question 9

Common Configuration issues with unbound media

Answer 9

Incorrect encryption, incorrect channel, incorrect frequency, ESSID mismatch, standard mismatch

Question 10

Bounce

Answer 10

Wireless issue. Could refer to how far a wireless signal is repeated / bounced (up to a mile with the right equipment) or could refer to mutliple paths, where the signal reflets off objects and arrives at the client degraded, out of phase.

Question 11

7 Troubleshooting Steps for Network+

Answer 11

Identify the problem; establish a theory of probably cause; test the theory to determine cause; establish a plan of action to resolve the problem and identify potential effects; implement the solution or escalate as necessary; verify full system functionality and (if applicable) implement preventative measures; document findings, actions, outcomes

Question 12

Port Speed: Common Problems.

Answer 12

Speed that a NIC or network hardware port can communicate at. These can be manually configured, and manually configured incorrectly.

Question 13

Port Duplex Mismatch

Answer 13

One side of a connection attempts to communicate using a different duplex setting than the other side of the connection.

Question 14

Three Duplex settings for each port of a network switch

Answer 14

Full, Half, Auto

Question 15

MTU

Answer 15

Maximum transmission unit. Largest size packet that is allowed across a segment. Usually around 1,500 bytes.

Question 16

Mismatched MTU

Answer 16

Two nodes on the network attempt to communicate when they have two different MTUs.

Question 17

Incorrect VLAN

Answer 17

When hosts on different VLANs attempt to communicate

Question 18

What is step 3 of the seven-step troubleshooting model?

Answer 18

Test the theory to determine cause

Question 19

What is step 7 of the seven-step troubleshooting model?

Answer 19

Document findings, actions, and outcomes

Question 20

How is crosstalk minimized in twisted-pair cabling?

Answer 20

Pairs of wire are twisted at a 90 degree angle

Question 21

If you plug a host into a switch port and the user cannot get to the server or other services
they need to access despite a working link light, what could the problem be?

Answer 21

Incorrect VLAN assignment

Question 22

What is it called when a cable has two wires of a twisted pair connected to two wires
from a different pair?

Answer 22

Split Pairs

Question 23

When a signal moves through any medium, the medium itself will degrade the signal.
What is this called?

Answer 23

Attenuation

Question 24

What is step 4 of the seven-step troubleshooting model?

Answer 24

Establish a plan of action to resolve the problem and identify potential effects

Question 25

What is step 5 of the seven-step troubleshooting model?

Answer 25

Implement the solution or escalate as necessary

Question 26

What are some of the problems that, if determined, should be escalated?

Answer 26

Switching loops. routing loops, routing problems, Proxy ARP, bordcast storms

Question 27

What cable issues should you know and understand for network troubleshooting?

Answer 27

Crosstalk, attenuation, collisions, shorts, open impedance mismatch, interference