SonicWALL TZ 170 SP Getting Started Manual page 29

Subnet Mask - A 32-bit number used to separate the network and host sections of an IP
address. A subnet mask subdivides an IP network into smaller pieces. An example
of a subnet mask might be 255.255.255.248 for subnet with only eight IP addresses.
TCP/IP - Transmission Control Protocol/Internet Protocol is the basic communication
protocol of the Internet. It supports sending information in packets, and identifies
each device with a unique numeric IP address.
VPN - A Virtual Private Network is a virtual network that encrypts data and sends it
privately over the Internet to protect sensitive information.
WAN - A Wide Area Network is a geographically distributed network composed of
multiple networks joined into a single large network. The Internet is a global WAN.