Extreme Networks ExtremeWare XOS Guide Manual page 469

Q
QoS
R
RADIUS
RARP
RFC
RIP
RMON
root bridge
root port
ExtremeWare XOS 11.1 Concepts Guide
Quality of Service. Policy-enabled QoS is a network service that
provides the ability to prioritize different types of traffic and to
manage bandwidth over a network. QoS uses various methods to
prioritize traffic, including IEEE 802.1p values and IP DiffServ values.
Remote Authentication Dial In User Service. RADIUS is a client/
server protocol and software that enables remote access servers to
communicate with a central server to authenticate dial-in users and
authorize their access to the requested system or service. RADIUS
allows a company to maintain user profiles in a central database that
all remote servers can share. It provides better security, allowing a
company to set up a policy that can be applied at a single
administered network point. With RADIUS, you can track usage for
billing and for keeping network statistics.
Reverse ARP. Using this protocol, a physical device requests to learn
its IP address from a gateway server's ARP table. When a new device
is set up, its RARP client program requests its IP address from the
RARP server on the router. Assuming that an entry has been set up in
the router table, the RARP server will return the IP address to the
machine which can store it for future use.
Request for Comment. The IETF RFCs describe the definitions and
parameters for networking.
Routing Information Protocol. This IGP vector-distance routing
protocol is part of the TCP/IP suite and maintains tables of all known
destinations and the number of hops required to reach each. Using
RIP, routers periodically exchange entire routing tables. RIP is suitable
for use only as an IGP.
Remote monitoring. RMON is a standardized method to make switch
and router information available to remote monitoring applications. It
is an SNMP network management protocol that allows network
information to be gathered remotely. RMON collects statistics and
enables a management station to monitor network devices from a
central location. It provides multivendor interoperability between
monitoring devices and management stations. RMON is described in
several RFCs. Network administrators use RMON to monitor, analyze,
and troubleshoot the network. A software agent can gather the
information for presentation to the network administrator with a
graphical user interface (GUI). The administrator can find out how
much bandwidth each user is using and what Web sites are being
accessed; you can also set alarms to be informed of potential network
problems.
In STP, the root bridge is the bridge with the best bridge identifier
selected to be the root bridge. The network has only one root bridge.
The root bridge is the only bridge in the network that does not have a
root port.
In STP, the root port provides the shortest path to the root bridge. All
bridges except the root bridge contain one root port.
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