Page 778

736

Glossary

SQE

Signal Quality Error: In an Ethernet network, a message sent from a

transceiver to an attached machine that the collision-detection circuitry is
working.

SRB

Source-Route Bridging: Created by IBM, the bridging method used in

Token Ring networks. The source determines the entire route to a destination
before sending the data and includes that information in route information
fields (RIF) within each packet. Contrast with: transparent bridging.

SRT

Source-Route Transparent Bridging: A bridging scheme developed

by IBM, merging source-route and transparent bridging. SRT takes
advantage of both technologies in one device, fulfilling the needs of all end
nodes. Translation between bridging protocols is not necessary. Compare
with: SR/TLB.

SR/TLB

Source-Route Translational Bridging: A bridging method that

allows source-route stations to communicate with transparent bridge sta-
tions aided by an intermediate bridge that translates between the two bridge
protocols. Used for bridging between Token Ring and Ethernet. Compare
with: SRT.

SSAP

Source Service Access Point: The SAP of the network node identified

in the Source field of the packet. See also: DSAP and SAP.

SSE

Silicon Switching Engine: The software component of Cisco's silicon

switching technology, hard-coded into the Silicon Switch Processor (SSP).
Silicon switching is available only on the Cisco 7000 with an SSP. Silicon-
switched packets are compared to the silicon-switching cache on the SSE.
The SSP is a dedicated switch processor that offloads the switching process
from the route processor, providing a fast-switching solution, but packets
must still traverse the backplane of the router to get to the SSP and then back
to the exit interface.

standard IP access list

IP access list that uses only the source IP addresses

to filter a network.

standard IPX access list

IPX access list that uses only the source and des-

tination IPX address to filter a network.

star topology

A LAN physical topology with endpoints on the network

converging at a common central switch (known as a hub) using point-to-
point links. A logical ring topology can be configured as a physical star

www.sybex.com