Which of the following statements best describes DiffServ? (Select the best answer.)
A.
It prioritizes packets by traffic class.
B.
It is not a QoS model that is recommended by Cisco for voice traffic.
C.
It requires applications to reserve their endtoend bandwidth requirements.
D.
It is a traffic policing mechanism for when traffic exceeds minimum bandwidth limits.
Explanation:
Differentiated Services (DiffServ) is a Quality of Service (QoS) model that prioritizes packets by traffic class.
QoS enables a network to treat a specific type of traffic with a different priority than other types of traffic. For
example, QoS can ensure that voice traffic gets higher priority on a network than data traffic. QoS models
include the besteffort model, the Integrated Services (IntServ) model, and the DiffServ model. Each QoS model
handles packet flows in a different manner.
IntServ, not DiffServ, requires that applications reserve their endtoend bandwidth requirements. In addition,
IntServ is not the QoS model that is recommended by Cisco. Cisco recommends using DiffServ instead of
other QoS models when configuring QoS for voice traffic.Committed Access Rate (CAR) is a traffic policing mechanism that you can use when traffic exceeds the
configured bandwidth limitations. When CAR is used, packets that exceed the bandwidth limits are re-marked
with a lower priority and forwarded instead of being dropped.https://www.cisco.com/en/US/technologies/tk543/tk766/technologies_white_paper09186a00800a3e2f.html