mnemonic acroyms:
ACROYM --> What it is--> Actual words
LSDOU = order of GPO application: Local - Site - Domain - Organizational Unit
AGUDLP = AD group nesting hierarchy: Account - Global Group - Universal Group - Domain Local Group - Permission
DORA = DHCP traffic sequence: Discovory - Offer - Request - Ack
APSTNDP = Seven layer OSI model: Application - Presentation - Session - Transmission - Network - Data Link - Physical (mnemonic hint)