I'm working on a setup currently.....
3,000 staff with mobiles.
maybe upward of 50KM of cables at one remote site.
network built using HP office connect 16's' because they were cheap, with TP-link & recent linksys
most wireless network kit so old it is using security cracked in 2008
2 server psu fires in the past soot covered the computers and it's never been cleaned
0 cleaning schedule in the server room for the last.......... 10 years
0 network diagram.
0 UPS
main incoming network & telicom equipment comes in under a 3 phase 600v switch panel.
With network cables handily using the 3 phase distribution ducts because they were 'easily accessible'
and windows servers so old, it makes Floppy drives look like advanced alien technology....