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| 3.3 |  | Windows and Cisco Commands for Physical Layer Information Gathering |
| 3.3.4 |  | Common Cisco IOS commands |

A variety of commands exist under the Cisco IOS to gather information on connectivity problems. When a router experiences an absence or intermittent loss of connectivity to other network components, the device can be interrogated for statistics collected on a port or interface. Additionally networking processes can be monitored in real-time to determine at what point in the sequence connectivity is lost. In the case where numerous routes exist to a desired destination, which is suffering intermittent or total loss of connectivity, information on the actual point at which the break occurs can be collected.