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Network + > Lesson 15 Troubleshooting Network Issues > Flashcards

Lesson 15 Troubleshooting Network Issues Flashcards

1
Q

What are the troubleshooting steps

A

Identify the problem

Establish probable cause

Test theory

Establish a plan of action

Implement the solution

Verify functionality

Document

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2
Q

What is ipconfig or ifconfig used for

A

to determine if host is configured for static or dynamic IP addressing

If host has valid IP address

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3
Q

What is ping used for

A

Connectivity troubleshooting

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4
Q

What is the ping command for IPv^

A

ping -6 (Windows)

ping6 (Linux)

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5
Q

What is the loopback address

A

127.0.0.1

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6
Q

What can you ping

A

Loopback address

specific device

host name

own IP address

default gateway

remote host

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7
Q

What are the ping responses

A

Reply from

Destination Network / Host Unreachable

Unknown Host

Request timed out

Hardware Error

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8
Q

What is traceroute and tracert used for

A

Traces communication until it gets an error

Tells where the connection failed

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9
Q

Which OS uses traceroute

A

LInux

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10
Q

Which OS uses tracecert

A

Windows

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11
Q

What is the ARP utility is used for

A

Add or delete ARP cache entries

Locating a node’s hardware address

Entries are permanent until deleted or device is powered down

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12
Q

What is the ARP cache used for

A

Maintaining a correlation between MAC and IP addresses

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13
Q

How do you reduce the number of ARP requests

A

Have addresses resolves in the cache for a short period of time

Flush the ARP cache periodically

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14
Q

If you can’t communicate between two host you can use arp utility to

A

compare the arp caches in each device to make sure that they are correct

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15
Q

What is NBTSTAT used for

A

Windows based

To view and manage NetBIOS over TCP/IP

Displays NETBIOS name tables for local and remote devices

You can verify connection establishment and refresh the NetBIOS name cache as well as names on the WINS server

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16
Q

What is NETSTAT used for

A

Shows status of each active network connection

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17
Q

NETSTAT shows statistics for

A

TCP and UDP

Local protocols

Local address

Foreign address

TCP connection state

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18
Q

What else can NETSTAT be used for

A

To find out if a TCP/IP program is listening on the expected port

Check connection status

Check network adapter error counts

Displays routing tables

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19
Q

What is nslookup used for

A

To test the domain name servers

It has two modes interactive (lists all) an non-interactive (list specific devices)

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20
Q

What is the DIG unix/Linux command

A

Used to display name server information. Maybe easier to use than nslookup

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21
Q

Why is WLAN survey software used

A

Used to analyze WLAN performance before and after implementation

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22
Q

SNIPS is used with which OS

A

UNIX

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23
Q

What is SNIPS

A

Network monitoring software

Reports status of services running on the network

Can set alarms as info, warning, error and crtical

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24
Q

What is a loopback interface used for

A

To test IP software without any potential issues from broken or corrupted drivers or hardware

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25
Q

What is the IPv4 loopback address

A

127.0.0.1

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26
Q

What is the IPv6 loopback address

A

::1

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27
Q

What do speed test measure

A

speed and latency

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28
Q

What is a looking glass site

A

Web server that allows user to get a look at routing and network behavior as it originates from the remote network.

Accesses a remote router and performs commands to of the IP and Border Gateway Protocol route tables

Used to verify routing between providers and verifying routes

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29
Q

This device attaches media connectors to the ends of cables

A

Crimper (wire or cable)

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30
Q

Used to stripper insulation from wires

A

Strippers

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31
Q

Used to connect cables to patch panels

A

Punch down tool

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32
Q

Used to see if current is passing between circuits

A

Circuit tester

33
Q

Used to test voltage and resistance

A

Multimeter

or

Voltmeter (can be used with VERs)

34
Q

Used to verify that a signal is transmitted by a cable

A

Cable tester

35
Q

Used to conduct cable and validity testing. It looks for shorts, crosstalk, it tests for cable type, determines if a cable is a straight through or crossover cable

A

Cable Certifier

36
Q

What type of cable is used to connect unlike devices

A

crossover cable

allows you to connect devices without a hub or switch

37
Q

What type of cable is used to connect like devices

A

pass through

38
Q

Which tool measures the electrical pulse on a cable and the amount of reflected signal

A

TDR

39
Q

Which type of tool is used with fiber testing

A

OTDR

40
Q

What else can OTDRs measure

A

Cable Length

Locations of faulty splices, breaks, connectors, and bends

Cable attenuation

41
Q

What device can send an electrical signal through a UTP wire

A

Tone Generator

42
Q

Tone Generators are used to

A

Trace wires for continuity and faults

43
Q

What ensures environmental conditions

A

Enviro monitors

44
Q

Used by linemen for troubleshooting phone lines

A

Butt Set

45
Q

Link Indicators tell

A

Signal reception

46
Q

Activity indicators tell

A

Tells received or sent data packets

47
Q

Network Analyzer

A

Protocol analyzer or packet sniffer

Can be used to defect network intrusions

48
Q

What is a demarc

A

Where private wire ends and provider wire begins

49
Q

WiFi testers check for

A

Detects devices and interference

50
Q

Light meters doe what

A

Detect the signal strength of light down a fiber cable

51
Q

Common physical issues with networks

A

Crosstalk

Near end cross talk

Far end cross talk

Attenuation

Collisions

Shorts

Open Impedance mismatch

Interference

SFP/GBIC

Pg 616

52
Q

What are some network logical issues

A

Port speed

Port duplex mismatch

VLAN assignment

Interface misconfiguration

Interface errors

Wrong Default gateway

Misconfigured DHCP

Misconfigured DNS

Duplicate IPs

Power failure

IP routes

NIC teaming misconfiguration

Unpatched system

Loss of connectivity

Split horizon

Router configurations

Premise wiring

Security policy

Satellite issues

PG 619

53
Q

Common route and switching issues

A

Switching loop

Routing loop

Route problems

Proxy ARP

Broadcast storms

Port configurations

VLAN assignment

Mismatched MTU

Pg 623

54
Q

Common wireless issues

A

Interference

Incorrect encryption type

Overlapping channels

Incorrect frequency

SSID mismatch

Standard mismatch

Signal strength loss

Bounce

Antenna placement

AP configuration

Incompatibilities

Incorrect channel

Latency

AP placement

Bandwidth saturation

Open network

Power levels

Rogue Access points

Wrong antenna

Pg 624

55
Q

Describe a troubleshooting model

A

Step by Step process in the correction of a problem

56
Q

Net + Troubleshooting model has how many steps

A

7

57
Q

Which command lines will allow you to view the hosts IP configurations

A

IPconfig or IFconfig

58
Q

Pinging by IP address instead of hostname will reveal what

A

name resolution issues

59
Q

Tracert command for IPV4 and IPV6

A

Tracert

Tracert -6

60
Q

Traceroute command for IPV4 and IPV6

A

Traceroute

Tracerout6

61
Q

To reduce the number of ARP requests a client does what

A

The client has all the addresses resolved in the cache for a short period of time

62
Q

Is the ARP cache finite

A

yes

63
Q

How do you free up space in the ARP cache

A

Periodically flush it of all entries

64
Q

ARP is best used for diagnosing what

A

Duplicate IP address and finding out where communications failed

65
Q

What is the most common ARP command line entry

A

arp -a

66
Q

Name the different ARP command line entry options

A

inet_addr

eth_addr

if_addr

  • a
  • g
  • N if_addr
  • d
  • s inet_addr eth_addr

Page 590

67
Q

If the ping command is blocked by a firewall, what can you do

A

Use ARP to find the host by MAC address and bypass the IP address resolution

68
Q

Name the different command lines for maintencance

A

Ping

ARP

NBTstat

NETSTat

69
Q

Name the different NBTstat command line entry options

A

See pg 591

70
Q

Which command shows the status of network connections for TCP, UDP inclding protocol, local addresses, foreign addresses, and TCP connection state

A

NETSTAT

71
Q

Name the different NETSTAT command line entry options

A

See pg 592

72
Q

Which command line entry display the socket states

A

NETSTAT

73
Q

Does the loopback address use hardware

A

no

74
Q

Types of cable tester and certifiers

A

Certification tester

Qualification tester

LAN tester

Network cable certifier

75
Q

Hardware loopback plug is used for testing what

A

a machine’s NIC

76
Q

What device emits an audible tone when it detects an audible signal

A

Tone Locator

77
Q

What are the types of LED indicators

A

Activity

Link

Speed

Dual color

78
Q

What is a smart jack

A

Jack that serves as a demarc between the user and the provider.

Can perform looping tests

79
Q

A spectrum analyzer compares what

A

Signal strength against frequency

Network + (13 decks)

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