Technical data

90362-01 Glossary L-7
router A machine that makes decisions about which of several paths
data-communications traffic will follow. A router uses a routing protocol
to gain information about the network, and algorithms to choose the
best route based on several criteria known as “routing metrics.” At the
lowest level, a bridge is a router because it chooses where to pass
packets from one wire to another. In a WAN each packet switch is a
router because it chooses routes for individual packets. In the Internet,
each IP gateway is a router because it chooses routes based on the IP
destination addresses. A router appears as a host on a network, not
just a transparent link. A router operates at the network layer.
routing table A table that works as a map, showing all the paths and distances
between the router and other networks. Routing tables are used by
routers to determine where to forward a data packet.
SecurID SecurID provides user authentication similar to that available on
NetBlazer/ACS. A remote SecurID user has a credit-card-sized,
calculator-like device that generates a six-digit code once each minute.
When this user logs in to a NetBlazer, the NetBlazer prompts the user
to enter the code and a PIN. If these entries are correct, the NetBlazer
prompts the user to request authentication. The user may have to
supply more information. When authentication is complete, the user is
either accepted or rejected.
seed router A router on an AppleTalk network that has the network number range
built into its port descriptor. Each AppleTalk network must have at least
one seed router. This router defines the network number range for the
other routers in that network.
SLIP S erial- L ine I nternet P rotocol. The Internet standard serial line
interface protocol, a packet-framing protocol that controls the
process of transferring TCP/IP packets across a serial link.
SLIP allows the network-routing codes to send any IP packet through a
serial port instead of an Ethernet port. SLIP provides data-transmission
speed up to19.2 Kbps on asynchronous serial ports. The NetBlazer
can use TCP/IP header compression with SLIP as well as PPP. The
NetBlazer is both compatible with the installed base of SLIP products
and can take advantage of the more advanced capabilities of PPP.
See also PPP, frame.