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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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Troubleshooting Process
Gathering Information
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Troubleshooting Process
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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Troubleshooting Issues
Software Utilities for Troubleshooting Connectivity
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Troubleshooting Issues
Troubleshooting Using Ipconfig
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Troubleshooting Issues
Troubleshooting Using Ping
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Troubleshooting Issues
Troubleshooting Using Ping
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Troubleshooting Issues
Troubleshooting Using Tracert
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Troubleshooting Issues
Troubleshooting Using Netstat
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Troubleshooting Issues
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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Troubleshooting and the Help Desk
Using Outside Sources for Help
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Troubleshooting and the Help Desk
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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