Once a year, properly.
INVENTORY
Every device accounted for Equipment age and support status established Anything out of support identified for replacement
CAPACITY
Device count against capacity Connection performance against requirements Wireless coverage where people now work
CABLING
Condition checked Labels still readable Any damaged runs replaced
CONFIGURATION
Firewall rules reviewed, undocumented ones investigated Exposed services reviewed Address assignments confirmed
RESILIENCE
Fallback connection tested Failover confirmed working Power protection confirmed
DOCUMENTATION
Updated to match reality Stored somewhere reachable when the network is down
CONTRACTS
Connection agreement reviewed Support arrangements confirmed
WHAT TO PRODUCE
A short list of what needs replacing or changing in the coming year, with costs.