Chapter 21: Network Troubleshooting Flashcards Preview

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Flashcards in Chapter 21: Network Troubleshooting Deck (20):
1

Open Circuit

When a wire doesn't connect from end to end.

2

Short

When a wire connects to another wire in the cable.

3

Wire Map Problem

When a wire doesn't connect to the proper place

4

Crosstalk

When the electrical signal bleeds from one wire pair to another.

5

Multimeter

Tests voltage, resistance, and continuity

6

Butt Sets

Tap into a 110-block to see if a line is working

7

arp

Command to view and change the ARP table

8

route print

Command used to display and edit the routing table.

9

nbtstat -n

Used to check the NetBIOS name cache and their corresponding IP addresses.

10

netstat

Displays info on your running IP processes

11

netstat -r

Shows the routing table

12

Port Scanner

Used to look for unintentionally opened ports

13

Throughput Testers

Measure the data flow in a network

14

Nmap

A popular port scanner

15

Divide and Conquer

Getting a general sense of where the problem lies, then starting from that layer of the OSI model

16

If a device is not discovering neighboring devices it may be....

DHCP or DNS issues

17

Concerning link aggregation, what could cause LACP to not initiate?

Both ports set to passive

18

Broadcast Storm

Nonstop broadcast frames being sent onto the network.
No one can reach the rest of the network.

19

Routing Loop

Routers loop traffic, causing them to respond slowly or not at all.
Huge amount of traffic on the links between the routers

20

Split Horizon

When a router learns a route through a certain interface, it will not not communicate it out that same interface.