Which command saves the active configuration to NVRAM?
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A. B. C. D.C.
The correct answer is C. "copy running-config startup-config" is the command that saves the active configuration to NVRAM.
Explanation:
NVRAM stands for Non-Volatile Random Access Memory, which is a type of memory that retains its data even when power is turned off. NVRAM is used to store the device's configuration, and it is important to save the active configuration to NVRAM in order to make the configuration persistent.
The "copy running-config startup-config" command is used to save the active configuration to NVRAM. This command copies the contents of the currently running configuration (which is stored in RAM) to the startup configuration (which is stored in NVRAM).
Option A, "copy startup-config running-config", copies the saved configuration from NVRAM to the currently running configuration in RAM. This command is typically used when you want to replace the current configuration with a previously saved one.
Option B, "copy active-config backup-config", is not a valid command. There is no "active-config" or "backup-config" file or location in Cisco devices.
Option D, "copy backup-config active-config", is also not a valid command. There is no "backup-config" or "active-config" file or location in Cisco devices.
Therefore, the correct answer is C, "copy running-config startup-config".