Which of the following characteristics of network traffic can be managed by Quality of Service (QoS)?
(Choose all that apply)

(A) Bandwidth
(B) LLQ
(C) Loss
(D) Delay
(E) CoS
(F) Jitter

A, C, D and F are the correct answers.

Cisco offers a wide range of QoS tools on both routers and switches. All these tools give you the means to manage four characteristics of network traffic:

• Bandwidth refers to the speed of a link, in bits per second(bps).
• Delay refers to the time between sending one packet and that same packet arriving at the destination host. Also, delay refers to the time between sending one packet and that same packet arriving at the destination host plus the time for the receiver of that packet to send back a packet.
• Jitter is the variation in the latency on a packet flow between two systems, when some packets take longer to travel from one system to the other. Jitter results from network congestion, timing drift, and route changes.
• Loss refers to the number of lost messages, usually as a percentage of packets sent.