User guide

User Guide 183
optional interface
An interface that connects to a second secured network, typically any network
of servers provided for public access.
optional network
A network protected by the firewall but still accessible from the trusted and
external networks. Typically, any network of servers provided for public access.
OSI (Open Systems Interconnection)
A standard description or reference model for how messages should be
transmitted between any two points in a telecommunication network. Its
purpose is to guide product implementors so that their products will consistently
work with other products.
out-of-band (OOB)
A management feature that enables the management station to communicate
with the Firebox using a telephone line and a modem. OOB is very useful for
remotely configuring a Firebox when Ethernet access is unavailable.
packet
A unit of information containing specific protocols and codes that allow precise
transmittal from one node in a network to another.
packet filtering
A way of controlling access to a network by analyzing the incoming and
outgoing packets and letting them pass or halting them based on the IP
addresses of the source and destination. Packet filtering is one technique,
among many, for implementing security firewalls.
passive mode FTP
See
active mode FTP
.
passphrase
An easy-to-remember phrase used for better security than a single password;
key crunching converts it into a random key.
password
A sequence of characters or a word that a user submits to a system for purposes
of authentication, validation, or verification.
password caching
The storage of a user’s username and password in a network administrator
database or encrypted file on a computer.
Password Authentication Protocol (PAP)
An authentication protocol that allows PPP peers to authenticate one another. It
does not prevent unauthorized access, but identifies the remote end.
PCI (peripheral component interconnect)
A unique network interface card slot on the motherboard of a computer.