Which file contains the active configuration running in memory?

Question

BlackTom AI · Accepted Answer

The running configuration (running-config) is stored in the device’s RAM and represents the active configuration that the device is currently using.

Relevant knowledge points and concepts:
- Network devices (Cisco routers/switches as an example) maintain two primary config files: running-config (in RAM) and startup-config (in NVRAM or flash).  
- The running-config is the live, editable configuration. Changes made in CLI affect running-config immediately.  
- The startup-config is the saved configuration used at boot; if you reboot without saving, running-config changes are lost.  
- Commands: show running-config (sh run) displays the active config; copy running-config startup-config saves the active config persistently.

Step-by-step reasoning:
1. Identify where the “active configuration running in memory” would reside: active and "running" imply it’s in volatile memory used during operation.  
2. Map that to device terminology: “running-config” is the standard name for the active configuration in RAM.  
3. Contrast with startup-config, which is stored nonvolatile and loaded at boot; BIOS configuration is firmware-level for PCs, not the router/switch active config file; default-config is not the standard term for the device’s live configuration.

Why the correct answer is correct:
- running-config literally denotes the configuration currently running in the device’s memory (RAM). It is modified in real time and is the source of the device’s operational behavior until saved.

Why other options are incorrect:
- startup-config (a) is the saved configuration used on boot, not the live memory copy.  
- BIOS configuration (b) pertains to PC firmware settings, not network device runtime config.  
- default-config (c) is not the standard term for an active configuration and does not refer to the running in-memory config.

Conclusion: The correct answer is d. running-config, which matches the provided answer.

Which file contains the active configuration running in memory?单项选择题

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