In the manual are used many shortcuts like ACL, DMZ, FQDN etc. This list should help to understand it and support some further information.
ACL
Access Control List
AD
Active Directory
https://en.wikipedia.org/wiki/Active_Directory
ADS
Active Directory member role
DC
DHCP
Dynamic Host Configuration Protocol
https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol
DMZ
DeMilitarized Zone
DNS
Domain Name Server
FQDN
Fully Qualified Domain Name
IAX
Inter-Asterisk eXchange
https://en.wikipedia.org/wiki/Inter-Asterisk_eXchange
IMAP
Internet Message Access Protocol
https://en.wikipedia.org/wiki/Internet_Message_Access_Protocol
ISP
Internet Service Provider
LAN
Local Area Network
LDAP
Lightweight Directory Access Protocol
https://en.wikipedia.org/wiki/Lightweight_Directory_Access_Protocol
NIC
Network interface controller
https://en.wikipedia.org/wiki/Network_interface_controller
NTP
Network Time Protocol
https://en.wikipedia.org/wiki/Network_Time_Protocol
PDC
Primary Domain Controller
POP3
Post Office Protocol
https://en.wikipedia.org/wiki/Post_Office_Protocol
PXE
Preboot Execution Environment
https://en.wikipedia.org/wiki/Preboot_Execution_Environment
SMTP
Simple Mail Transfer Protocol
https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol
UPS
Uninterruptible Power Supply
VLAN
Virtual Local Area Network
VPN
Virtual Private Network
WAN
Wide area network
https://en.wikipedia.org/wiki/Wide_area_network
WPAD
Web Proxy Autodiscovery Protocol
https://en.wikipedia.org/wiki/Web_Proxy_Autodiscovery_Protocol