Domain Name System (DNS)

  1. DNS Troubleshooting and Diagnostics
    1. Diagnostic Tools
      1. nslookup
        1. Interactive Mode
          1. Batch Queries
            1. Server Selection
              1. Record Type Specification
              2. dig
                1. Query Syntax
                  1. Output Interpretation
                    1. Trace Functionality
                      1. Batch Processing
                      2. host
                        1. Simple Lookups
                          1. Reverse Queries
                          2. systemd-resolve
                            1. Modern Linux Resolution
                              1. Cache Management
                              2. Network Analysis Tools
                                1. Wireshark DNS Analysis
                                  1. tcpdump Packet Capture
                                2. Common Problems
                                  1. Configuration Errors
                                    1. Syntax Mistakes
                                      1. Missing Records
                                        1. Incorrect Delegations
                                        2. Propagation Issues
                                          1. TTL Effects
                                            1. Cache Staleness
                                              1. Update Delays
                                              2. Network Connectivity
                                                1. Firewall Blocking
                                                  1. Routing Problems
                                                    1. Server Unavailability
                                                    2. Performance Issues
                                                      1. Slow Resolution
                                                        1. Timeout Problems
                                                          1. High Query Rates
                                                        2. Troubleshooting Methodology
                                                          1. Problem Identification
                                                            1. Systematic Testing
                                                              1. Log Analysis
                                                                1. Performance Measurement
                                                                2. Monitoring and Maintenance
                                                                  1. Health Monitoring
                                                                    1. Performance Metrics
                                                                      1. Capacity Planning
                                                                        1. Preventive Maintenance

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                                                                      8. DNS Implementation and Deployment

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                                                                      10. DNS Security