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D-18
Glossary
protocol suite
A group of protocols related to a common framework.
RARP (reverse address resolution protocol)
A protocol that translates MAC addresses to IP addresses.
ring
A network of stations that uses a circular logical topology. Data is 
passed from station to station, for examination or copying, and is 
finally returned to the originating station, which removes the data 
it transmitted from the network.
RISC (Reduced Instruction Set Computing)
A data processing technology in which functions are performed 
using the least possible number of instructions to yield very fast 
processing.
RTMP (Routing Table Maintenance Protocol)
In the AppleTalk routing protocol, RTMP is a distance vector 
routing protocol similar to RIP. It keeps track of hop 
count/destination network range pairs. Split Horizon is 
performed, but poison reverse and triggering are not. Periodic 
updates are sent once every 10 seconds. Individual route lifetimes 
are not kept. Instead, all routes are marked as “suspect” once every 
20 seconds. If the route is not updated by the next 20 second 
interval, it is marked bad. Following two or more intervals, the 
route is removed from the table.
SAC (single attachment concentrator)
A concentrator with a slave (S) port for attachment to the FDDI