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Startup configuration

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

The startup configuration is the Cisco IOS configuration stored in nonvolatile memory and loaded when the device boots.

Startup configuration is the Cisco IOS configuration saved in NVRAM and loaded when the device boots. It preserves device settings across reloads. section 8.1.2

Verify and inspect the saved configuration with:

Inspecting startup configuration

Switch# dir nvram: lists startup-config. Switch# more nvram:startup-config then shows its saved IOS commands and the timestamp of the last NVRAM update.

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Defines storage and boot behavior, then demonstrates three IOS commands for locating and viewing the saved file.
Examples
Uses show startup-config, dir nvram:, and more nvram:startup-config with annotated Cisco IOS output.
What you can do after
Operate Cisco IOS verification commands to locate and inspect the configuration loaded at boot.
How it connects
Contrasts startup-config in NVRAM with running-config in the system: file system and relates both to IOS file systems.
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