Quality of Service (QoS)
UPDATED ACTUAL Exam
Questions and CORRECT Answers
Save
Terms in this set (69)
When looking to provision Real
Why is Quality
Time communications across a
of Service
network that is being shared w/
important?
data.
All elements in the network ( &
WAN provider network) are
How does configured to recognize Real Time
Quality of communications streams & give
Service help? them the treatment or 'priority'
they need in order to get to their
destination on time.
,W/in the LAN & Delay, Jitter, Packet loss &
WAN Voice Bandwidth.
quality is
dependent on?
For best Voice One way end-to-end should be no
quality Delay more than 150ms. AKA latency.
should be?
For best Voice No more the 30ms.
quality Jitter
should be?
Ping tests ( -l or -s linx/unix
How to test for
parameter loads the ping packets
Delay & Jitter?
to a more realistic size).
In a fully Delay will not be problem, but
switched routers will insert move delay into
Ethernet a network.
environment
will Delay be a
problem?
, 1. Hardware Delay through the
network.
2. Variable Delay e.g Router
What are
queues.
Network Delay
3. Transit Delay (the time to
types?
traverse networks)
4. Processing Delay in the end
devices.
Pinging w/ 238 bytes of data to
simulate a G.711 voice frame.
ping -l 238 x.x.x.x
Measuring
Delay example? Replay x.x.x.x bytes=238
time=40ms TTL=64
Replay x.x.x.x bytes=238
time=40ms TTL=64
The variation in delay from the
What is Jitter?
expected value.
UPDATED ACTUAL Exam
Questions and CORRECT Answers
Save
Terms in this set (69)
When looking to provision Real
Why is Quality
Time communications across a
of Service
network that is being shared w/
important?
data.
All elements in the network ( &
WAN provider network) are
How does configured to recognize Real Time
Quality of communications streams & give
Service help? them the treatment or 'priority'
they need in order to get to their
destination on time.
,W/in the LAN & Delay, Jitter, Packet loss &
WAN Voice Bandwidth.
quality is
dependent on?
For best Voice One way end-to-end should be no
quality Delay more than 150ms. AKA latency.
should be?
For best Voice No more the 30ms.
quality Jitter
should be?
Ping tests ( -l or -s linx/unix
How to test for
parameter loads the ping packets
Delay & Jitter?
to a more realistic size).
In a fully Delay will not be problem, but
switched routers will insert move delay into
Ethernet a network.
environment
will Delay be a
problem?
, 1. Hardware Delay through the
network.
2. Variable Delay e.g Router
What are
queues.
Network Delay
3. Transit Delay (the time to
types?
traverse networks)
4. Processing Delay in the end
devices.
Pinging w/ 238 bytes of data to
simulate a G.711 voice frame.
ping -l 238 x.x.x.x
Measuring
Delay example? Replay x.x.x.x bytes=238
time=40ms TTL=64
Replay x.x.x.x bytes=238
time=40ms TTL=64
The variation in delay from the
What is Jitter?
expected value.
