|  | 13.1 | Troubleshooting the 5-Router Network
| 13.1.1 | The standard configuration
Throughout this entire semester you have been using the same basic configuration for your labs and simulations. For these troubleshooting labs, you can refer to this configuration and imagine what could go wrong with it, in terms of the OSI layers. - Examples of problems in each layer might include: Layer 1 - incorrect cable used Layer 2 - interface not configured for Ethernet Layer 3 - subnet mask is incorrect