Nortel BayStack 820, Installation And Reference Manual

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206901-A
Glossary-3
edge router A router that resides at the edge of a LAN that is used to communicate with
the WAN.
encryption
Encryption allows data to be encrypted before it is sent out to the WAN, and
decrypted when it is received from over the WAN. This is to secure and
protect private data from being pirated over the WAN.
These routes implement such a feature, which can be enabled or disabled on a
per-serial interface basis (for example, a frame relay DLCI or a point-to-point
leased-line connection). Because of a lack of standard encryption negotiation
scheme, this feature requires the use of the same type of router on the other
end of the encrypted link(s), and the use of the same encryption algorithm and
key for each encrypted link (different links can use different algorithms and
keys).
flash memory
A special read-write memory that keeps its content after power is removed
from it. Because of its easy reprogrammable nature, it is often used to store
programs (firmware) for embedded products so that firmware upgrade
becomes an easy process.
FTP
File Transfer Protocol. Protocol that allows a user on one host to access and
transfer files to and from another host over a network. On the Internet, a tool
for accessing linked files. See also TFTP.
GMT Greenwich Mean Time.
hop An intermediate connection in a series of connections linking two network
devices, for example, routers. Each time a packet is forwarded to the next
router, a hop occurs.
HTTP
HyperText Transfer Protocol. A client/server protocol for linking text files to
one another in order to share information on the Internet and the World Wide
Web (WWW).
hunt group A ISDN service that routes calls such that if ISDN line 1 is busy, a second call
activates line 2.
ICMP Internet Control Message Protocol. Part of the TCP/IP suite of protocols that
is often used for error reporting, control, and informational purposes.
IGMP
IP Group Multicast Protocol. A protocol used with the IP multicasting feature.
IP Multicast
An IP-based protocol that sends one copy of data to multiple destinations
through a network consisting of multicast-capable routers. Those who wish to
“subscribe” to a particular multicast service will have to register through the
IP Multicast protocol.