After troubleshooting a router, the network administrator wants to save the router configuration so that it will be used automatically the next time that the router reboots. What command should be issued?

Question

BlackTom AI · Accepted Answer

The running configuration resides in RAM and must be written to NVRAM as the startup configuration to persist across reboots, so use "copy running-config startup-config".

1) Relevant knowledge points and concepts
- running-config: the active configuration stored in RAM while the router is running. Changes made in the CLI affect running-config immediately.
- startup-config: the configuration stored in NVRAM that the router loads when it boots.
- To make runtime changes persistent, the running-config must be saved to startup-config. Cisco IOS provides the command copy running-config startup-config (also available as the older alias write memory or wr mem).

2) Step-by-step reasoning
- After troubleshooting, the administrator has made changes; those are in running-config (volatile).
- On reboot, the router loads startup-config from NVRAM. If the running-config was not copied to startup-config, any changes will be lost.
- Therefore the correct action is to copy the current running-config into the startup-config location in NVRAM.

3) Example CLI steps (intermediate steps shown)
- show running-config   (verify current settings)
- copy running-config startup-config
  - When prompted for destination filename, accept default by pressing Enter.
  - IOS copies the file into NVRAM.
- show startup-config   (verify the saved configuration matches)

4) Why the correct answer is correct
- copy running-config startup-config explicitly writes the active, in-memory configuration into the nonvolatile startup location so it will be used automatically on the next boot.

5) Why the other options are incorrect
- reload: reboots the router immediately (does not save running-config), so unsaved changes would be lost.
- copy startup-config running-config: copies the saved configuration into RAM, overwriting the current running-config (opposite of what’s needed).
- copy startup-config flash: copies the saved config into flash memory (not the standard way to make the router use it on boot) and is not the correct method to save current running-config for boot.

6) Conclusion
The correct command is a. copy running-config startup-config, which matches the provided answer.

After troubleshooting a router, the network administrator wants to save the router configuration so that it will be used automatically the next time that the router reboots. What command should be issued?单项选择题

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