CISCO IT Essentials abridged note

1. Chapter 12:
Advanced Troubleshooting
Advanced troubleshooting means that the probable cause is difficult to diagnose. Advanced
troubleshooting uses not only your advanced diagnostic skills when working with hardware and
software, but also the interaction between technicians and customers or other technicians. Computer
problems can be attributed to hardware, software, networks, or some combination of the three. The
way in which you work with customers and other technicians can determine how quickly and
comprehensively the problem gets diagnosed and solve.
12.1 Six Steps for Advanced Troubleshooting Computer Components and Peripherals
Step 1: Identify the Problem
Step 2: Establish a Theory of Probable Cause
Step 3 – Test the Theory to Determine Cause.

2. Step 4 – Establish a plan of action to resolve the problem and implement the solution.
Step 5 – Verify Full System Functionality and, if applicable, Implement Preventive Measures.
Step 6 – Document Findings, Actions and Outcomes.
12.2 Common Problems and Solutions for Operating Systems
The troubleshooting process helps resolve problems with the operating system.
A stop error is a hardware or software malfunction that causes the system to lock up. An
example of this type of error is known as the Blue Screen of Death (BSOD) and appears when the system
is unable to recover from an error. The BSOD is usually caused by device driver errors.
The Event Log and other diagnostic utilities can be used to research a stop error or BSOD error.
To prevent these types of errors, verify that the hardware and software drivers are compatible and in
addition install the latest patches and updates for the windows.
Lab 12.2.1.4, 12.2.1.5, 12.2.1.6, 12.2.1.7 & lab 12.2.1.8
12.3 Troubleshooting Process to Networks
Network problems can be attributed to hardware, software, or a combination of the two.
Common problems related to Networks
(i) Network Connection Problems

3. These types of connection problems are often related to incorrect TCP/IP configurations, firewall
settings, or devices that have stopped working.
(ii) Email Failure
This is not being able to send or receive email is often caused by incorrect email software
settings, firewall settings, and hardware connectivity issues
(iii) FTP and Secure Internet Connection Problems
This is often caused by incorrect IP address, port setting, or security policy. Secure Internet
connection problems are often related to incorrect certificate settings and ports blocked by
software or hardware,
Exercises
Lab 12.3.1.4,……5,……..6,……..7,……..8
12.4 Troubleshooting Process to Laptops
These problems range from the simple, such as updating a driver, to more complex
problems, such as replacing an inverter. If there is a need to replace laptop components, make
sure that the correct replacement component and tools recommended by the manufacturer.
Step 1 – Identify the Problem.
Step 2 – Establish a Theory of Probable Cause.

4. Step 3 – Test the Theory to Determine Cause.
Step 4 – Establish a Plan of Action to Resolve the Problem and Implement the Solution.
Step 5 – Verify Full System Functionality and, if applicable, Implement Preventive Measures.
Step 6 – Document Findings, Actions and Outcomes.
Exercise
Lab 12.4.1.4,….5,….6,….7,…..8
Troubleshooting Process to Printers
With printer problems, a technician must be able to determine if the problem exists with the device,
cable connection, or the computer to which it is attached.
Step 1 – Identify the Problem.

5. Step 2 – Establish a Theory of Probable Cause.
Step 3 – Test the Theory to Determine Cause.
Step 4 – Establish a Plan of Action to Resolve the Problem and Implement the Solution.
Step 5 – Verify Full System Functionality and, if applicable, Implement Preventive Measures

6. Step 6 – Document Findings, Actions and Outcomes.
Exercise
Lab 12.5.1.4,….5,…6,……7,…….8
12.5 Troubleshooting Process to Security
Computer technicians must be able to analyze a security threat and determine the appropriate method
to protect assets and repair damage. This process is called troubleshooting
Common Problems
(i) Malware Settings
Malware protection problems are often related to incorrect software settings or configurations.
(ii) User Accounts and Permissions
Unauthorized access or blocked access is often caused by incorrect user account settings or
incorrect permissions
(iii) Computer Security
Computer security problems can be caused by incorrect security settings in the BIOS or on the
hard drive
(iv) Firewall and Proxy Settings
Blocked connections to networked resources and the Internet are often related to incorrect
firewall and proxy rules, and incorrect port settings
Step 1 – Identify the Problem.

7. Step 2 – Establish a Theory of Probable Cause.
Step 3 – Test the Theory to Determine Cause.
Step 4 – Establish a Plan of Action to Resolve the Problem and Implement the Solution.
Step 5 – Verify Full System Functionality and, if applicable, Implement Preventive Measures

8. Step 6 – Document Findings, Actions and Outcomes.
Exercise
Lab 12.6.1.4,…5,…6,….7,……8
Questions
1. A technician arrives and asks a customer, "Can you describe the problem?" The customer
replies, "All email messages that I send have the wrong date. I have restarted the computer
several times, but this does not seem to help."
What could be the problem?
The CMOS battery has failed.
The hard drive is beginning to fail.
The MBR is corrupted.
The CPU voltage is set too low.
2.
A customer using a Windows XP computer is complaining that a new card reader is not working. A
technician tests the card reader on a Windows 7 computer and does not detect any problems. What are
two possible solutions to the problem with the XP computer? (Choose two.)
Modify the options in the BIOS.
Update the CMOS firmware.
Install additional RAM.
Download and install the driver from the manufacturer of the card reader.
Install the driver from the CD provided with the card reader.
3.
A technician is replacing an internal hard drive used as a secondary drive on a PC. After connecting the

9. new hardware and powering up the computer, an "OS not found" error message is displayed. What is
the most probable cause for that error message?
The USB port has too many attached devices to supply adequate power.
The motherboard needs replacing to be able to support the new hard drive.
The BIOS needs updating.
The power supply is faulty.
The hard drive jumper is set incorrectly.
4.
4. A technician is upgrading an older PC with a dual core CPU. When the PC restarts, it is slower than it
was before the upgrade. The Performance tab from the Task Manager displays only one CPU graph.
What is the most probable solution to this problem?
Update the BIOS firmware to support the dual core CPU.
Increase the amount of RAM available.
Replace the HDD with a higher capacity hard drive.
Overclock the CPU.
5.
A laptop that is running Windows XP displays "Missing NTLDR" after the POST. What are the two most
probable reasons for this problem? (Choose two.)
There is a conflict with a newly installed device.
The index service is not indexing in the correct locations.
Boot.ini is missing or damaged.
The boot order is not set correctly in the BIOS.
BOOTMGR has been corrupted.
6.
Several times during the last few days, a user has experienced the Blue Screen of Death when plugging
an external hard drive into a laptop via USB. What is a possible solution for this problem?
Upgrade the operating system.
Research the boot error beep code to identify the source of the error.
Research the STOP error and the name of the module that produced the error.

10. Reinstall the operating system.
7. A computer repeatedly locks without any error message. Which two conditions may be the cause of
the problem? (Choose two.)
The index service is not running.
The computer has a virus.
An update has corrupted the operating system.
The UAC has been turned off.
The user has breached the user security policy.
The CPU needs to be upgraded.
8.
What are two possible solutions to any Windows computer restarting continuously and never displaying
the desktop? (Choose two.)
Upgrade the processor.
Press F8 to open the Advanced Options menu and choose Disable Automatic Restart on System
Failure.
Access the BIOS and change the boot order options.
Run chkdsk /F /R from the recovery console.
Upgrade the video card.
Reset the hard drive jumpers.
9.
A PC is not able to connect to a wired network. Pinging the loopback address is successful, but the
gateway cannot be reached. On the network switch all the interface lights are on, except for the
interface connected to the PC. The LED on the network card is off. What is the most likely cause of this
problem?
The gateway needs to be fixed.
The network cable is faulty.

11. The network switch is faulty.
The PC has an incorrect IP address for the DNS server.
10.
Users in a recently installed wireless network are complaining of slow data transfer and frequent loss of
connectivity. The technician checks that the wireless security is correctly implemented, and there is no
evidence of unauthorized users on the network. Which two problems might the technician suspect?
(Choose two.)
There is interference from outside sources.
The DHCP server is faulty.
The wireless signal is too weak.
The antenna on the access point is too powerful.
The network passwords need to be reissued to the users.
11.
A group of users is unable to connect to the network. When testing several of the PCs and issuing the
command ipconfig, the technician notices that all of them have an IP address in the 169.254.x.x range.
What is the most likely cause of this problem?
Your
Response
The Internet connectiion is down.
The DHCP server is not operational.
The gateway address is incorrect.
The DNS server is not operational.
12.
A technician is working on a laptop that has a dark display. After attaching an external display and
verifying that it works, the technician now has a better idea as to the problem. What could be the
problem?
The power inverter of the LCD screen or backlight lamp has failed.
The CPU has failed.
The motherboard has failed.
The display driver is incorrect.

12. 13.
A technician replaces a laptop keyboard that was no longer functioning, and has verified that the newly
replaced keyboard functions properly. What is the final step the technician should take as part of the
troubleshooting process?
Document all findings, actions, and outcomes.
Implement preventive measures.
Research the problem.
Ask a list of closed-ended questions.
14.
A user complains that when a page is printed on a laser printer, the page smears when touched. What is
a possible cause of this issue?
The fuser has failed.
The pickup rollers are defective.
The EP drum is damaged.
The laser assembly is faulty.
15.
A technician finds that occasionally when a network printer is restarted, clients are unable to print to it,
receiving a "Document failed to print" message. What is a probable cause of this?
The printer is configured to get an IP address using DHCP.
The toner level in the EP cartridge is low.
The drum is damaged.
The printer does not have enough memory.
The power supply on the printer is failing.
16.
A user complains that a printer is outputting random characters instead of the desired document. What
is a probable cause of this?
An incorrect print driver is installed.
The printer does not have enough memory.
There is dirt or debris in the printer.
The pickup rollers are defective.
17.

13. A freshly installed Windows 7 laptop is plugged into the network and configured with an IP address. The
technician then attempts to ping the laptop from another computer. While the laptop is able to connect
to other devices, the ping requests fail. What is the likely cause?
The Windows Firewall is blocking ping requests.
The port speed for the NIC is incorrect.
The network drivers for the NIC are out of date.
TPM must be enabled.
18.
A computer displays this message when the computer boots: "MBR has been changed or modified."
What could cause this problem?
A boot sector virus has altered the master boot record.
A virus has altered the Windows kernel.
The CMOS battery has failed.
A RAM module is not fully inserted into the memory slot.
19.
Users are complaining that they are receiving spam from the email account that belongs to a co-worker.
What could cause this problem?
The email account belonging to the co-worker was hijacked because of malware.
The email client belonging to the co-worker is not configured properly.
The network adapter on the computer that is used by the co-worker is malfunctioning.
A virus has damaged the master boot record on the system that is used by the co-worker.
20.
A technician is troubleshooting a laptop that has the power light on and the hard drive spinning.
However, the laptop only displays vertical lines that change color. What is the problem?
The LCD screen inverter has failed.
The backlight lamp has failed.
The LCD screen has failed.
The BIOS is corrupt.
21.

14. A technician is troubleshooting a laser printer that outputs blank paper for all print jobs including printer
test pages. What is a probable cause?
The drum is failing to hold a charge.
The drum wiper blade is worn.
The laser printer does not have adequate memory.
The fuser has failed.
22.
A technician is troubleshooting a Windows 7 laptop infected with a virus that has damaged the master
boot record. The technician has booted the laptop using the installation media and is attempting to
repair the laptop from the command line interface. Which two commands can the technician use to
repair the corrupt master boot record? (Choose two.)
bootrec /fixboot
bootrec /fixmbr
chkdsk
regedit
regedt32