What do you need to know about the device? What can you get from the manual, and what has to come from the staff on site?
Some suggestions:
Basic data about the device – vendor, release date, rough cost
Type of device – for example a router, is it enterprise, consumer, or “roll your own”
Some advanced data about the device – latest OS version, options for connectivity (console, web, etc.)
Types of data on the device – volatile and persistent (for example MAC address table or hard drive
Commands, processes, and options to show, print, or preserve the data
Location of the log files on the device
