| 1: | What is the name of the layer above the network layer in the DoD model? |
| A1: | Host-to-host layer. |
| 2: | Name at least one keyword for each of Layer 2, Layer 3, and Layer 4 of the OSI model. |
| A2: | Layer 2: Frame; Layer 3: Packet; Layer 4: Segment. |
| 3: | What is the communication subsystem in the seven-layer OSI model? |
| A3: | The communication subsystem includes the first three layers of the model. |
| 4: | What is the baseline of the system? |
| A4: | The baseline is the expected behavior of the system. |
| 5: | Name at least five of the key concepts in the troubleshooting process. |
| A5: | Baseline, topology, gathering, tools, and solutions. |
| 6: | What are the complete and the shortest IOS commands to save the running configuration to the NVRAM? |
| A6: | The complete command is #copy running-config startup-config. The shortest command is #wr. |
| 7: | What are the complete and the shortest IOS commands to cancel all debugging in the router? |
| A7: | The complete command is #undebug all. The shortest command is #u all. |
| 8: | Why does the CDP use a multicast address? |
| A8: | Using a multicast address prevents routing because Cisco routers do not forward this traffic, unless specifically configured. |
| 9: | When troubleshooting the serial interface, you see HDLC protocol type 0x2000, what is it? |
| A9: | HDLC protocol type 0x2000 stands for CDP protocol. |
| 10: | Is it recommended that you disable the CDP over the dialer interface? If so, what is the command? |
| A10: | The extensive information from CDP output requires the CDP to be disabled in interfaces, which cannot be controlled or user -owned. The command is #no cdp enable. |
| 11: | What is the measurement of the spread when measuring the path characteristics with Pchar? |
| A11: | The standard deviation. |
| 12: | What does ICMP type 3 mean? |
| A12: | ICMP type 3 means Destination Unreachable. |
| 13: | What is the command to see the statistics when using Service Assurance Agent (SAA)? |
| A13: | #show rtr collection-statistics |
