User guide

Reference Guide 161
typically derived from analog sources, and usually involve the
use of special hardware.
RC4 (Rivest Cipher 4)
A variable key size stream cipher, once a proprietary algorithm of
RSA Data Security, Inc.
RC5 (Rivest Cipher 5)
A block cipher with a variety of arguments, block size, key size,
and number of rounds.
related hosts
A method to place hosts on the Optional or External interface
when using a simple or drop-in network configuration. Examples
include placing a router on the External interface or an HTTP
server on the Optional interface.
related networks
Networks on the same physical wire as the Firebox interfaces but
with network addresses that belong to an entirely different
network.
repeater
A network device that regenerates signals so that they can extend
the cable length.
report
A formatted collection of information that is organized to provide
project data on a specific subject.
revocation
Retraction of certification or authorization.
RFC (Request for Comments)
RFC documents describe standards used or proposed for the
Internet. Each RFC is identified by a number, such as RFC 1700.
RFCs can be retrieved either by email or FTP.
ring topology
A basic networking topology in which all nodes are connected in a
circle with no terminated ends on the cable.
route
The sequence of hosts through which information travels to reach
its destination host.