Watchguard Firebox X1000 Reference Manual page 132

CHAPTER 9: Glossary
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ESP (Encapsulation Security Payload)
A protocol used in IPSec used with IPSec Branch Office VPN and
MUVPN. ESP encapsulates and authenticates IP packets to be
passed over the tunnel, providing confidentiality, data integrity,
and origin authentication. ESP is similar to AH, except that it
provides encryption.
Ethernet
Networking standards, originally developed in 1973 and
formalized in 1980, involving the transmission of data at 10 Mbps
using a specified protocol.
Ethernet address
A unique address that is obtained automatically when an Ethernet
adapter is added to the computer. This address identifies the node
as a unique communication item and enables direct
communications to and from that particular computer.
event
Any network incident that prompts some kind of notification.
event processor
See WatchGuard Security Event Processor.
expand
To display all subordinate entries in an outline or in a folder.
extension
See file extension.
external interface
An interface connected to the external network that presents the
security challenge, typically the Internet.
external network
The network presenting the security challenge.
failover
Configuration that allows a secondary machine to take over in the
event of a failure in the first machine, allowing normal use to
return or continue.
WatchGuard Firebox System