Lesson 15 Troubleshooting Network Issues Flashcards by Dwain Stevens

What are the troubleshooting steps

Identify the problem

Establish probable cause

Test theory

Establish a plan of action

Implement the solution

Verify functionality

Document

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What is ipconfig or ifconfig used for

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

If host has valid IP address

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What is ping used for

Connectivity troubleshooting

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What is the ping command for IPv^

ping -6 (Windows)

ping6 (Linux)

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What is the loopback address

127.0.0.1

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What can you ping

Loopback address

specific device

host name

own IP address

default gateway

remote host

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What are the ping responses

Reply from

Destination Network / Host Unreachable

Unknown Host

Request timed out

Hardware Error

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What is traceroute and tracert used for

Traces communication until it gets an error

Tells where the connection failed

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Which OS uses traceroute

LInux

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Which OS uses tracecert

Windows

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What is the ARP utility is used for

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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What is the ARP cache used for

Maintaining a correlation between MAC and IP addresses

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How do you reduce the number of ARP requests

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

Flush the ARP cache periodically

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

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

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What is NBTSTAT used for

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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What is NETSTAT used for

Shows status of each active network connection

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NETSTAT shows statistics for

TCP and UDP

Local protocols

Local address

Foreign address

TCP connection state

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What else can NETSTAT be used for

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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What is nslookup used for

To test the domain name servers

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

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What is the DIG unix/Linux command

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

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Why is WLAN survey software used

Used to analyze WLAN performance before and after implementation

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SNIPS is used with which OS

UNIX

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What is SNIPS

Network monitoring software

Reports status of services running on the network

Can set alarms as info, warning, error and crtical

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What is a loopback interface used for

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

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What is the IPv4 loopback address

127.0.0.1

What is the IPv6 loopback address

::1

What do speed test measure

speed and latency

What is a looking glass site

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

This device attaches media connectors to the ends of cables

Crimper (wire or cable)

Used to stripper insulation from wires

Strippers

Used to connect cables to patch panels

Punch down tool

Used to see if current is passing between circuits

Circuit tester

Used to test voltage and resistance

Multimeter or Voltmeter (can be used with VERs)

Used to verify that a signal is transmitted by a cable

Cable tester

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

Cable Certifier

What type of cable is used to connect unlike devices

crossover cable allows you to connect devices without a hub or switch

What type of cable is used to connect like devices

pass through

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

TDR

Which type of tool is used with fiber testing

OTDR

What else can OTDRs measure

Cable Length Locations of faulty splices, breaks, connectors, and bends Cable attenuation

What device can send an electrical signal through a UTP wire

Tone Generator

Tone Generators are used to

Trace wires for continuity and faults

What ensures environmental conditions

Enviro monitors

Used by linemen for troubleshooting phone lines

Butt Set

Link Indicators tell

Signal reception

Activity indicators tell

Tells received or sent data packets

Network Analyzer

Protocol analyzer or packet sniffer Can be used to defect network intrusions

What is a demarc

Where private wire ends and provider wire begins

WiFi testers check for

Detects devices and interference

Light meters doe what

Detect the signal strength of light down a fiber cable

Common physical issues with networks

Crosstalk Near end cross talk Far end cross talk Attenuation Collisions Shorts Open Impedance mismatch Interference SFP/GBIC Pg 616

What are some network logical issues

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

Common route and switching issues

Switching loop Routing loop Route problems Proxy ARP Broadcast storms Port configurations VLAN assignment Mismatched MTU Pg 623

Common wireless issues

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

Describe a troubleshooting model

Step by Step process in the correction of a problem

Net + Troubleshooting model has how many steps

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

IPconfig or IFconfig

Pinging by IP address instead of hostname will reveal what

name resolution issues

Tracert command for IPV4 and IPV6

Tracert Tracert -6

Traceroute command for IPV4 and IPV6

Traceroute Tracerout6

To reduce the number of ARP requests a client does what

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

Is the ARP cache finite

yes

How do you free up space in the ARP cache

Periodically flush it of all entries

ARP is best used for diagnosing what

Duplicate IP address and finding out where communications failed

What is the most common ARP command line entry

arp -a

Name the different ARP command line entry options

inet_addr eth_addr if_addr - a - g - N if_addr - d - s inet_addr eth_addr Page 590

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

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

Name the different command lines for maintencance

Ping ARP NBTstat NETSTat

Name the different NBTstat command line entry options

See pg 591

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

NETSTAT

Name the different NETSTAT command line entry options

See pg 592

Which command line entry display the socket states

NETSTAT

Does the loopback address use hardware

Types of cable tester and certifiers

Certification tester Qualification tester LAN tester Network cable certifier

Hardware loopback plug is used for testing what

a machine's NIC

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

Tone Locator

What are the types of LED indicators

Activity Link Speed Dual color

What is a smart jack

Jack that serves as a demarc between the user and the provider. Can perform looping tests

A spectrum analyzer compares what

Signal strength against frequency

Lesson 15 Troubleshooting Network Issues Flashcards

(79 cards)