A rookie mistake: making changes and then losing them on the next power cycle because they were only in the running-config, not the startup-config. Rename the router to CORE-1 and persist the change to NVRAM.

Topology

Router

Objectives

○Hostname set to CORE-1
○Running config saved to startup

Hints

Hint — two equivalent commands

Both work: copy running-config startup-config (modern) or write memory (legacy shorthand, still supported).

Hint — full sequence

enable
configure terminal
 hostname CORE-1
 end
copy running-config startup-config

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