Outline

Modules: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | All |

Module 3: Troubleshooting at the Physical Layer

Module Overview |

3.1

Characteristics of Physical Layer Failure Problems

3.1.1 | Critical characteristics – connectivity
3.1.2 | Critical characteristics – upper layer component operation
3.1.3 | Noncritical characteristics – equipment indicators
3.1.4 | Noncritical characteristics – power failures
3.1.5 | Noncritical characteristics – console messages

3.2

Characteristics of Physical Layer Optimization Problems

3.2.1 | Performance lower than baseline
3.2.2 | Exceeding cable design limits, poor quality cabling and connections
3.2.3 | Noise
3.2.4 | Collisions
3.2.5 | Other data transmission issues
3.2.6 | Resources
3.2.7 | Utilization
3.2.8 | Console messages

3.3

Windows and Cisco Commands for Physical Layer Information Gathering

3.3.1 | End-system commands – common commands
3.3.2 | End-system commands – Windows only
3.3.3 | End-system commands – UNIX/Mac OS
3.3.4 | Common Cisco IOS commands
3.3.5 | Cisco IOS show commands

3.4

Identifying Physical Layer Problems

3.4.1 | Power related
3.4.2 | Cabling faults – CAT5
3.4.3 | Cabling faults – fiber and coax
3.4.4 | Hardware
3.4.5 | Collision based problems – shared media
3.4.6 | External interference
3.4.7 | Configuration script errors
3.4.8 | CPU overload

3.5

Isolating Physical Layer Problems

3.5.1 | Methodology
3.5.2 | Tools for the job
3.5.3 | Bad cabling
3.5.4 | Cabling incorrect
3.5.5 | Interface configuration
3.5.6 | Operational statistics

3.6

Implementing Physical Layer Solutions

3.6.1 | Solving common problems – methodology
3.6.2 | ARP commands
3.6.3 | Solving common problems – Windows, UNIX/MAC OS end-system commands
3.6.4 | Solving common problems – Cisco IOS commands
3.6.5 | Redundancy
3.6.6 | Solving common problems – support resources

Module Summary |
Module Quiz |

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