CCNA Dis1 - Chapter 9 - Troubleshooting Your Network [Compatibility Mode]

8/3/2019 CCNA Dis1 - Chapter 9 - Troubleshooting Your Network [Compatibility Mode]

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Chapter 9 Troubleshooting YourNetwork

CCNA Discovery 4.0

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Objectives

Describe the troubleshooting process. Describe the utilities used to verify TCP/IP connectivity. Identify and describe common hardware and connection

issues in wired and wireless networks.

Utilize the troubleshooting process to document problemsand interact with a help desk.

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Troubleshooting Process

Troubleshooting Troubleshooting is the process of identifying, locating and correcting

problems that occur

Build in documentation: The problem encountered

Steps taken to determine thecause of the problem

Steps to correct the problem

and ensure that it will not

reoccur



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Gathering Information



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Approaches to TroubleshootingThere are several different structured troubleshooting techniques available,

including:

Top-down Bottom-up Divide-and-conquer



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Troubleshooting Issues

Detecting Physical Problems

The Sense of Sight The Sense of Smell The Sense of Touch The Sense ofHearing

Cables which arenot connected

Cables connectedto the wrong port Loose cableconnections Damaged cablesand connectorsUse of the wrong

type of cableVision also allowsus to view thecondition andfunction of variousnetwork devices

with LEDs

The smell can alerttroubleshooters to

components whichare overheating.The smell of burninginsulation orcomponents is verydistinct and is a suresign that something

is seriously wrong

Troubleshooters canuse touch to feel for

overheatedcomponents as wellas a detectmechanicalproblems withdevice such ascooling fans. These

devices usuallycreate a smallvibration in thecomponent that candetected usingtouch

Hearing is useddetect major

problems such aselectrical issues andthe proper operationof cooling fans anddisk drivers.Alldevices havecharacteristic sound

and any changefrom the normalsounds usallyindicatea problem ofsome sort



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Software Utilities for Troubleshooting Connectivity



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Troubleshooting Using Ipconfig



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Troubleshooting Using Ping



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Troubleshooting Using Ping



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Troubleshooting Using Tracert



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Troubleshooting Using Netstat



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Troubleshooting Using Nslookup



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Common Issues

Connectivity Issues



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Common Issues

LED indicators



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Common Issues

Connectivity Problems



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Common Issues

Troubleshooting Radio Problems in a WLAN



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Common Issues

Troubleshooting Association & Authentication on aWLAN



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Common Issues

DHCP Issues



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Common Issues

Troubleshooting the ISR to ISP Connection



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Troubleshooting and the Help Desk

Describe the importance of documentation



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Using Outside Sources for Help



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Using the HelpDesk



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Summary

Effective troubleshooting combines instinct, experience,and structured techniques to identify, locate, and correctnetwork or computer problems.

Documentation is essential in effective troubleshooting,and should contain baseline information about the network.

A large proportion of networking problems relate tophysical components.

Many networking problems can be identified with softwareutilities such as ping, tracert, and netstat.

In a network containing both wired and wirelessconnections, it is important to isolate the problem to eitherthe wired or wireless network.



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CCNA Dis1 - Chapter 9 - Troubleshooting Your Network [Compatibility Mode]