ZyXEL Communications ZyXEL XtremeMIMO X-550 User Manual
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ZyXEL X-550 User’s Guide
QoS
Quality of Service
R
RADIUS
Remote Authentication Dial-In User Service allows for remote users to dial into a central server and be 
authenticated in order to access resources on a network 
Reboot
To restart a computer and reload it's operating software or firmware from nonvolatile storage.
Rendezvous
Apple's version of UPnP, which allows for devices on a network to discover each other and be connected 
without the need to configure any settings 
Repeater
Retransmits the signal of an Access Point in order to extend it's coverage
RIP
Routing Information Protocol is used to synchronize the routing table of all the routers on a network
RJ-11
The most commonly used connection method for telephones
RJ-45
The most commonly used connection method for Ethernet
RS-232C
The interface for serial communication between computers and other related devices
RSA
Algorithm used for encryption and authentication
S
Server
A computer on a network that provides services and resources to other computers on the network
Session key
An encryption and decryption key that is generated for every communication session between two 
computers 
Session layer
The fifth layer of the OSI model which coordinates the connection and communication between 
applications on both ends 
Simple Mail Transfer Protocol
Used for sending and receiving email
Simple Network Management Protocol
Governs the management and monitoring of network devices
SIP
Session Initiation Protocol. A standard protocol for initiating a user session that involves multimedia 
content, such as voice or chat. 
SMTP
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