ASK FIRST
control failure, visibility failure, power event, or network path?
Tap the CODE shown on the projector.
Tap any device to inspect IP, VLAN, protocol, port, role, and control criticality.
DELIVERYROLESTACK
UNICASTone source to one destination
BROADCASTone source to local subnet
MULTICASTone source to subscribed group
HARDWIREprotection without network help
TRACE
operator view → network policy → controller state → field evidence.
DESIGN
give each system the access it needs, not the access commissioning found convenient.