CyberGuard SG300 User Manual page 274

Router A network device that moves packets of data. A router differs from
hubs and switches because it is "intelligent" and can route packets to
their final destination.
RSA Digital A public/private RSA key pair used for authentication. The CyberGuard
Signatures SG appliance can generate these key pairs. The public keys need to
be exchanged between the two parties in order to configure the tunnel.
SHA Secure Hash Algorithm, a 160 bit hash. It is one of two message digest
algorithms available in IPSec.
Security Security Parameter Index, an index used within IPsec to keep
Parameter Index connections distinct. Without the SPI, two connections to the same
(SPI) gateway using the same protocol could not be distinguished.
Subnet mask See "Net mask".
Switch A network device that is similar to a hub, but much smarter. Although
not a full router, a switch partically understands how to route Internet
packets. A switch increases LAN efficiency by utilizing bandwidth more
effectively.
TCP/IP Transmission Control Protocol/Internet Protocol. The basic protocol for
Internet communication.
TCP/IP address Fundamental Internet addressing method that uses the form
nnn.nnn.nnn.nnn.
TripleDES Using three DES encryptions on a single data block, with at least two
(3DES) different keys, to get higher security than is available from a single DES
pass.
UTC Coordinated Universal Time.
UTP Unshielded Twisted Pair cabling. A type of Ethernet cable that can
operate up to 100Mb/s. Also known as Category 5 or CAT 5.
VPN Virtual Private Networking. When two locations commmunicate
securely and effectively across a public network (e.g. the Internet).
The three key features of VPN technology are privacy (nobody can see
what you are communicating), authentication (you know who you are
communicating with), and integrity (nobody can tamper with your
messages/data).
WAN Wide Area Network.
WINS Windows Internet Naming Service that manages the association of
workstation names and locations with IP addresses.
Appendix A – Terminology
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