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Chapter 9: Troubleshooting the Network

  • 9.0 Troubleshooting the Network
    • 9.0.1 Introduction
      • 9.0.1.1 Introduction
      • 9.0.1.2 Class Activity - Network Breakdown
  • 9.1 Troubleshooting with a Systematic Approach
    • 9.1.1 Network Documentation
      • 9.1.1.1 Documenting the Network
      • 9.1.1.2 Network Topology Diagrams
      • 9.1.1.3 Establishing a Network Baseline
      • 9.1.1.4 Establishing a Network Baseline, Cont.
      • 9.1.1.5 Measuring Data
      • 9.1.1.6 Activity - Identify Benefits for Establishing a Network Baseline
      • 9.1.1.7 Activity - Identify Commands Used for Measuring Data
      • 9.1.1.8 Packet Tracer - Troubleshooting Challenge - Documenting the Network
    • 9.1.2 Troubleshooting Process
      • 9.1.2.1 General Troubleshooting Procedures
      • 9.1.2.2 Gathering Symptoms
      • 9.1.2.3 Questioning End Users
      • 9.1.2.4 Activity - Identify Commands for Gathering Symptoms
    • 9.1.3 Isolating the Issue Using Layered Models
      • 9.1.3.1 Using Layered Models for Troubleshooting
      • 9.1.3.2 Troubleshooting Methods
      • 9.1.3.3 Troubleshooting Methods, Cont.
      • 9.1.3.4 Guidelines for Selecting a Troubleshooting Method
      • 9.1.3.5 Activity - Troubleshooting Methods
  • 9.2 Network Troubleshooting
    • 9.2.1 Troubleshooting Tools
      • 9.2.1.1 Software Troubleshooting Tools
      • 9.2.1.2 Software Troubleshooting Tools, Cont.
      • 9.2.1.3 Hardware Troubleshooting Tools
      • 9.2.1.4 Using a Syslog Server for Troubleshooting
      • 9.2.1.5 Activity - Identify Common Troubleshooting Tools
    • 9.2.2 Symptoms and Causes of Network Troubleshooting
      • 9.2.2.1 Physical Layer Troubleshooting
      • 9.2.2.2 Data Link Layer Troubleshooting
      • 9.2.2.3 Network Layer Troubleshooting
      • 9.2.2.4 Transport Layer Troubleshooting - ACLs
      • 9.2.2.5 Transport Layer Troubleshooting – NAT for IPv4
      • 9.2.2.6 Application Layer Troubleshooting
      • 9.2.2.7 Activity - Identify the OSI Layer Associated with a Network Issue
    • 9.2.3 Troubleshooting IP Connectivity
      • 9.2.3.1 Components of Troubleshooting End-to-End Connectivity
      • 9.2.3.2 End-to-End Connectivity Problem Initiates Troubleshooting
      • 9.2.3.3 Step 1 - Verify the Physical Layer
      • 9.2.3.4 Step 2 - Check for Duplex Mismatches
      • 9.2.3.5 Step 3 - Verify Layer 2 and Layer 3 Addressing on the Local Network
      • 9.2.3.6 Step 4 - Verify Default Gateway
      • 9.2.3.7 Step 5 - Verify Correct Path
      • 9.2.3.8 Step 6 - Verify the Transport Layer
      • 9.2.3.9 Step 7 - Verify ACLs
      • 9.2.3.10 Step 8 - Verify DNS
      • 9.2.3.11 Activity - Identify Commands to Troubleshoot a Network Issue
      • 9.2.3.12 Packet Tracer - Troubleshooting Enterprise Networks 1
      • 9.2.3.13 Packet Tracer - Troubleshooting Enterprise Networks 2
      • 9.2.3.14 Packet Tracer - Troubleshooting Enterprise Networks 3
      • 9.2.3.15 Packet Tracer - Troubleshooting Challenge - Using Documentation to Solve Issues
  • 9.3 Summary
    • 9.3.1 Summary
      • 9.3.1.1 Class Activity - Documentation Development
      • 9.3.1.2 Summary
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