Watchguard Firebox X1000 Reference Manual page 161

Reference Guide
Trusted interface
The interface on the Firebox that connects to the internal network,
which should be protected to the maximum practical amount.
Trusted network
The network behind the firewall that must be protected from the
security challenge–usually, the Internet.
tunnel
An entity through which one network sends its data by way of
another network's connections. Tunneling works by
encapsulating a network protocol within packets carried by the
second network. For example, Microsoft's PPTP technology
enables organizations to use the Internet to transmit data across a
virtual private network (VPN). It does this by embedding its own
network protocol within the TCP/IP packets carried by the
Internet.
twisted-pair cable
A cable used for both network and telephone communications.
Also known as UTP (unshielded twisted pair) and 10BASE-T/
100BASE-T cable.
UDP (User Datagram Protocol)
A connectionless protocol. Used less frequently for long-distance
connections, largely because it lacks TCP's congestion control
features. Used quite heavily in local area networks for NFS.
URL (Universal Resource Locator)
The user-friendly address that identifies the location of a Web site
such as http://www.watchguard.com.
validation
A means to provide timeliness of authorization to use or
manipulate information or resources.
verification
The act of comparing a signature created with a private key to its
public key. Verification proves that the information was actually
sent by the signer and that the message has not been subsequently
altered by anyone else.
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