Comprehensive Troubleshooting Methodology - Make Questions

Troubleshooting Methodology
Objective 5.1: Explain the troubleshooting methodology
● Step One
○ Step 1: Identify the Problem
■ First step in troubleshooting methodology
■ Gather information from the user
■ Identify user changes and perform backups if applicable
■ Inquire about environmental or infrastructure changes
○ Techniques
■ Ask user to describe the issue, symptoms, and changes
■ Ask about error messages, noises, or other symptoms
■ Inquire if others are experiencing the same problem
■ Determine how long the issue has been happening
■ Ask about recent changes to the system
■ Check if the user has tried any troubleshooting steps
○ Importance of Backups
■ Perform backups before proceeding with troubleshooting steps 2 through
6
■ Backup ensures data safety, especially when replacing hardware or
making configuration changes
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■ Helps restore data in case of unintended consequences during
troubleshooting
● Step Two
○ Step 2: Establish a Theory of Probable Cause
■ Requires questioning the obvious and conducting internal or external
research based on observed symptoms
■ Goal
● Guess the problem based on symptoms, severity, and initial
questioning of end users
■ Consider if the issue is hardware, software, operating system, application,
or driver-related
■ Probable Cause
● Most likely reason for an issue among all the different possible
causes
● Select the most likely cause first
○ If it does not solve the problem, try other possibilities
systematically
○ Research and Inspection
■ External research
● Utilize online resources like Google and DownDetector
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■ Internal research
● Use system documentation, logs, and diagnostic tools for research
■ Physically inspect the machine for clues like fan noise, hard drive sounds,
or burning smells
■ Reproduce the problem if necessary, especially in large organizations
where there may be a delay in technician response
○ Troubleshooting Approaches
■ Top-to-bottom Approach
● Start from layer seven (application layer) of the OSI model and
work down to layer one, checking each layer for issues
■ Bottom-up Approach
● Start from layer one (physical layer) and work up to layer seven,
checking each layer for issues
■ Divide and Conquer Approach
● Start from a midpoint in the OSI model and test for issues, then
determine if the problem lies above or below that point
○ Collaboration and Knowledge Sharing
■ Communicate with other technicians or colleagues who may have worked
on the same issue to avoid duplication of efforts
■ Learn from others' experiences and document what has already been
tried to avoid repeating unsuccessful steps
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● Step Three
○ Step 3: Test the Theory
■ Purpose
● Determine the cause of the problem
■ CompTIA's Definition
● Test the theory to determine the cause
○ Once confirmed, determine the next steps to resolve the
problem
○ If not confirmed, establish a new theory or escalate
○ Step 3 Focus
■ Testing the theory without making any configuration changes to the
system
● Example
○ Testing a theory that a computer won't turn on because
it's unplugged from the wall outlet
○ Solution
■ Confirm the theory by plugging in the computer
and turning it on
■ If Theory Is Not Confirmed
● Establish a new theory based on observed symptoms
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● Example
○ If the computer still doesn't turn on after being plugged in,
consider that the wall outlet may not provide enough
power
○ Testing the New Theory
■ Use tools like a volt meter to test the theory (e.g.,
measuring voltage in the wall outlet)
■ If the theory is confirmed
● Determine the next steps to resolve the problem (e.g., fixing or
replacing the power supply)
○ Possible Outcomes
■ Theory Confirmed
● Proceed to fix the issue
■ Theory Not Confirmed
● Come up with a new theory
● Test the new theory
● If confirmed, proceed to fix the problem
■ Lack of Skills and Authority
● Escalate if the problem requires skills or authority
● Example
○ If a fix requires a part replacement or policy change
outside expertise, escalate to the relevant team
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■ Inability to Solve
● Escalate to higher-tier support (e.g., Tier 2 or Tier 3 technicians)
for additional assistance
● Tiered Support Structure
○ Tier 1 – Basic problem-solving
○ Tier 2 – More advanced problem-solving
○ Tier 3 – Subject matter experts (SMEs) and system
administrators
● Step Four and Step Five
○ Step 4: Establish a Plan of Action
■ Purpose
● Solve the underlying probable cause identified in steps 2 and 3
■ Options
● Repair
● Replace
● Create a workaround
■ Considerations
● Repair costs versus replacement costs
● Organizational guidelines on repair versus replacement
● Temporary solutions for critical issues
● Cost-effective solutions for temporary needs
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○ Step 5: Implement the Solution
■ Devise a plan detailing resources, time, and cost associated with the
solution
■ Identify impacts on other users or systems
■ Seek permission according to corporate policies and procedures
■ Examples
● Rebooting servers
● Updating systems
● Replacing hardware
■ Stick to the plan and seek reauthorization for any changes
■ Impact of Solutions
● Consider the scale of the system affected (e.g., end-user machine
versus server)
● Rebooting servers can impact authentication and access across
the organization
● Disconnecting users from a file server may not affect other
services like printing
○ Final Notes
■ Follow the established plan and seek reauthorization for any changes
■ Ensure you are working as part of a larger team and consider the broader
impact of your actions on the network
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● Step Six
○ Step 6: Verify System Functionality
■ Purpose
● Ensure the resolution implemented in previous steps effectively
addresses the root cause and prevents future issues
○ Steps Recap
■ Step 1 – Identify Problem
■ Step 2 – Establish Theory of Probable Cause
■ Step 3 – Test Theory
■ Step 4 – Establish Plan of Action
■ Step 5 – Implement Solution
■ Step 6 – Verify Full System Functionality
○ Verification Process
■ Confirm resolution addresses original problem
■ Check replaced components for proper operation (e.g., power supply,
RAM)
■ Ensure system functions normally post-resolution
■ Inspect for any additional damage or disconnected components
■ Verify disabled/uninstalled software remains inactive
■ Review logs and diagnostic tools for abnormalities
■ Update software and device drivers for security and functionality
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○ Implementing Preventative Measures
■ Educate users on secure practices (e.g., safe downloading habits)
■ Enforce policies (e.g., restricting downloads, no food/drink near
equipment)
■ Address recurring issues by proposing policy changes to management
○ Role of Technician
■ Ensure system functions as well as or better than before issue
■ Prevent future issues through education and policy enforcement
■ Collaborate with management to implement effective preventative
measures
● Step Seven
○ Step 7: Troubleshooting Documentation
■ Documenting findings, actions, and outcomes
● What was wrong
● What was done about it
● How to prevent it in the future
○ Methods
■ Trouble Ticketing System
● Document problems, assignments, actions taken, and solutions
■ Internal Knowledge Base
● Store troubleshooting steps and lessons learned
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■ Frequently Asked Questions (FAQs)
● Contains support articles based on common user questions.
○ Benefits
■ Helps new technicians learn from past experiences
■ Facilitates trend analysis to identify common issues
■ Justifies resource needs based on workload
○ Tools
■ Any system can be used as long as it allows for documentation of findings,
actions, and outcomes
■ Examples
● Freshdesk
● Jira
● HelpScout
● Intercom
○ Usage
■ Document findings as soon as problems are identified
■ Update documentation as troubleshooting progresses
■ For larger problems, update documentation regularly
○ Trend Analysis Example
■ Password Reset Trend
● Identified through ticket analysis
● Led to implementing a self-service password reset option
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● Resulted in a 90% reduction in password-related tickets
○ Resource Justification Example
■ Increased ticket volume due to new systems without user training
■ Used ticket data to justify need for more help desk staff
■ Highlights the importance of adequate resources for efficient support

Comprehensive Troubleshooting Methodology

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