Appendix
A communications network transports a multitude of applications and data,
sful end-to-end
solution. Therefore, QoS is the set of techniques to manage network
including high-quality video and delay-sensitive data such as real-time voice.
Networks must provide secure, predictable, measurable, and sometimes
guaranteed services.
Achieving the required QoS becomes the secret to a succes
business
resources.
QoS class
Every incoming frame is classified to a QoS class, which is used throughout the
is a
e lowest priority.
device for providing queuing, scheduling and congestion control guarantees to
the frame according to what was configured for that specific QoS class. There
one to one mapping between QoS class, queue and priority. A QoS class of 0
(zero) has th
R
RARP
is an acronym for
R
RARP
everse
A
ddress
R
esolution
P
rotocol. It is a protocol
the complement of ARP.
that is used to obtain an IP address for a given hardware address, such as an
Ethernet address. RARP is
RADIUS
RADIUS is an acronym for
R
emote
A
uthentication
D
ial
I
n
U
ser
S
ervice. It is a
networking protocol that provides
centralized access, authorization and
accounting management for people or computers to connect and use a network
service.
RSTP
In 1998, the IEEE with document 802.1w introduced an evolution of STP:
the
R
apid
S
panning
T
ree
P
rotocol, which provides for faster spanning tree
time being
wards-compatible with STP.
convergence after a topology change. Standard IEEE 802.1D-2004 now
incorporates RSTP and obsoletes STP, while at the same
back
S
sFlow
sFlow is an industry standard technology for monitoring switched networks
pling of
samples
through random sampling of packets on switch ports and time-based sam
port counters. The sampled packets and counters (referred to as flow
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Summary of Contents for GV-POE0812
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