"Do I Know This Already?" Quiz

The purpose of the "Do I Know This Already?" quiz is to help you decide whether you need to read the entire chapter. If you already intend to read the entire chapter, you do not necessarily need to answer these questions now.

The 18-question quiz, derived from the major sections in the "Foundation Topics" portion of the chapter, helps you determine how to spend your limited study time.

Table 9-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 9-1. "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundation Topics Section Covering These Questions	Questions	Score
Classification and Marking	15
Congestion Management	611
Policing	1214
AutoQoS	1518
Total Score

You can find the answers to the "Do I Know This Already?" quiz in Appendix A, "Answers to the 'Do I Know This Already?' Quizzes and Q&A Sections." The suggested choices for your next step are as follows:

• 8 or less overall score Read the entire chapter. This includes the "Foundation Topics," the "Foundation Summary," and the "Q&A" sections.
  
  
• 9 or 10 overall score If you want more review on these topics, skip to the "Foundation Summary" section and then go to the "Q&A" section. Otherwise, move to the next chapter.
  
  

Classification and Marking

1.	What methods does a Catalyst 2950 currently use to classify traffic? CoS CoS and DSCP CoS, DSCP, and access lists CoS, DSCP, access lists, and NBAR
2.	What QoS map needs to be modified on the Catalyst 2950 to allow the switch to match the Layer 2 and Layer 3 currently marked by Cisco IP Phones? DSCP to CoS CoS to DSCP CoS-to-IP Precedence map IP Precedence-to-CoS map DSCP-to-IP Precedence map IP Precedence-to-DSCP map
3.	By default, what values does the Catalyst 2950 trust? CoS DSCP CoS and DSCP None of the above
4.	Which of the following is not a trust option on the Catalyst 2950? Trust CoS Trust IP Precedence Trust DSCP Trust Cisco Phone
5.	What does the command mls qos trust cos pass-through dscp do? Enables trust of CoS values only if a DSCP value is present Enables trust of CoS values and does not modify the DSCP value Enables trust of CoS only if the DSCP value matches the CoS-to-DSCP map Enables trust of DSCP only if a CoS value is present

Congestion Management

6.	How many egress queues are present on each Ethernet interface of the Catalyst 2950? 1 2 4 8
7.	Which three scheduling methods are supported on the Catalyst 2950? Strict priority scheduling Custom scheduling Strict priority and WRR scheduling MDRR scheduling WRR scheduling FIFO scheduling
8.	Which scheduling method is configured by default on a Catalyst 2950? Strict priority scheduling Custom scheduling Strict priority and WRR scheduling MDRR scheduling WRR scheduling FIFO scheduling
9.	Which scheduling method is recommended for networks that transport IP telephony traffic? Strict priority scheduling Custom scheduling Strict priority and WRR scheduling MDRR scheduling WRR scheduling FIFO scheduling
10.	Which command is used to assign a CoS value of 5 to queue 4? wrr-queue cos-map 5 4 wrr-queue cos-assign 4 5 wrr-queue cos-map 4 5 wrr-queue cos-assign 5 4
11.	Which of the following commands is used to enable strict priority with WRR scheduling on the Catalyst 2950? wrr-queue bandwidth 20 1 80 P wrr-queue bandwidth 0 20 1 80 wrr-queue bandwidth 20 1 80 0 wrr-queue bandwidth P 20 1 80

Policing

12.	What is a policer? A policer measures the data rate of arriving packets, identifies conforming and nonconforming traffic flows, and takes action on the traffic flows based upon the traffic contract. A policer measures the available bandwidth of an interface, identifies the traffic peaks, and takes action on peak traffic based upon the traffic contract. A policer measures the data rate of arriving packets, identifies known and unknown traffic flows, and takes action on the unknown traffic flows based upon the traffic contract. A policer measures the available bandwidth of an interface, identifies the known and unknown traffic flows, and takes action on the unknown traffic flows based upon the traffic contract.
13.	What is out-of-profile or nonconforming traffic? Traffic routed out of the wrong interface Received traffic that exceeds the rate specified by the policer Received traffic that does not exceed the rate specified by the policer Received traffic that has not been defined by the policer
14.	What can a policer do with nonconforming traffic on a Catalyst 2950? Drop it Remark the DSCP value Remark the CoS value A and B B and C

AutoQoS

15.	Which of the following commands enables AutoQoS on the Catalyst 2950? auto qos trust auto qos voip trust auto qos trust voip auto qos cisco-phone auto qos trust cisco-phone
16.	What does the command auto qos voip trust do? Enables trust of CoS on applied interface Enables trust of DSCP on applied interface Changes CoS-to-DSCP map Changes DSCP-to-CoS map Enables strict priority scheduling Enables strict priority queuing A, C, and F B, D, and E A, B, C, D, and F
17.	What does the command auto qos voip cisco-phone do? Enables trust of CoS for a Cisco IP Phone Enables trust of DSCP for a Cisco IP Phone Changes CoS-to-DSCP map Changes DSCP-to-CoS map Enables strict priority scheduling Enables strict priority queuing A, C, and F B, D, and E A, B, C, D, and F
18.	What command can you use to verify AutoQoS on a Catalyst 2950? show qos auto show auto qos show auto cos show cos auto