Summary Cont

* To provide end-to-end QoS, the enterprise and service providers must implement the proper QoS mechanisms.

* Active queuing management mechanisms drop packets before congestion occurs.

* First-in-first-out (FIFO) queuing is the classic algorithm for packet transmission.

* The queuing options preferred for remote access are WFQ, CBWFQ and LLQ.

© 2004 Cisco Systems, Inc. All rights resewed. bcran v2.1—10-18

Use the practice items here to review what you learned in this lesson. The correct answers are found in the Quiz Answer Key.

Q1) Which of the following is true of voice traffic?

A) can tolerate delays

B) is time-sensitive

C) can wait until a network recovers

D) is typically very large

Q2) Video has what kind of bandwidth requirement?

A) average

B) moderate to high

C) moderate to low

Q3) Which quality of service model allows applications to signal the network in advance to request special QoS?

A) Best Effort

B) Integrated Services

C) Differentiated Services

Q4) Which QoS mechanism drops packets early in order to prevent congestion later in the network?

A) classification

B) marking

C) congestion avoidance

D) congestion management

Q5) What is it called when multiple TCP hosts reduce their transmission rates in response to packet dropping, and then increase their transmission rates again when congestion is reduced?

A) global synchronization

B) global packeting

C) packet buffering

D) load balancing

Q6) Prioritization may be necessary in which location?

A) campus

B) end-to-end points

C) WAN edge congestion points

Q7) Which queuing option is NOT an alternative to FIFO queuing on Cisco routers?

A) weighted fair queuing

B) class-based weighted fair queuing

C) traffic-rate queuing

D) custom queuing

Q8) Depending on the average packet size, prioritization is most effective when applied to links at_.

A) ISDN BRI bandwidth speeds or higher

B) T1/E1 bandwidth speeds or lower

C) 56 kbps bandwidth speeds or lower

D) OC-3 bandwidth speeds or higher

Q9) Which factors must a network manager consider when establishing a queuing policy?

A) providing an appropriate level of service for all users

B) controlling expensive WAN costs

D) none of the above

Q10) Which queuing method would work best on congested WAN links where delay is a concern?


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