As mentioned in the Introduction, you have two choices for review questions. The following questions give you a more difficult challenge than the exam itself by using an open-ended question format. By reviewing now with this more difficult question format, you can exercise your memory better, and prove your conceptual and factual knowledge of this chapter. You can find the answers to these questions in Appendix A.
The second option for practice questions is to use the CD-ROM included with this book, which includes a testing engine and more than 200 questions and drag-and-drop tasks. You should use this CD-ROM nearer to the end of your preparation, for practice with the actual exam format.
| 1. | Why do you need QoS in the LAN?
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| 2. | What is buffer overflow and when does it occur?
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| 3. | What IOS types are available for the Catalyst 2950 and which one is preferred for QoS?
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| 4. | You have a Catalyst 2950 running the standard IOS image and need to migrate to a Catalyst 2950 running the enhanced IOS image. What are your options to migrate to a Catalyst 2950 running the enhanced IOS image?
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| 5. | What methods can a Catalyst 2950 currently use to classify traffic?
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| 6. | What map needs to be changed on the Catalyst 2950 to reflect the current markings of Cisco IP Phones?
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| 7. | What command is used to verify the CoS-to-DSCP map?
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| 8. | By default, a Catalyst 2950 maps voice-media traffic and voice-signaling traffic to which DSCP values?
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| 9. | To keep the DSCP values of the voice-media traffic and the voice-signaling traffic consistent between the IP phones and the Catalyst 2950, which DSCP values need to be configured on the Catalyst 2950?
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| 10. | By default, what values does the Catalyst 2950 trust?
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| 11. | Name two of the three markings or devices that the Catalyst 2950 can use to extend a trust boundary.
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| 12. | Where is the trust command configured on a Catalyst 2950?
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| 13. | What does the switchport priority extend cos 0 command do?
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| 14. | What does the mls qos trust cos pass-through dscp command do?
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| 15. | What command enables the trust of a Cisco IP Phone on a Catalyst 2950?
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| 16. | How does the Catalyst 2950 determine whether a Cisco IP Phone is connected to a port configured to trust device cisco-phone?
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| 17. | What happens if an interface is configured to trust device cisco-phone and a PC is connected to the interface?
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| 18. | Which command set the default CoS value of an interface to 2 for all untagged frames received?
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| 19. | What does the command mls qos cos override do?
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| 20. | What command views the current trust state of interface Fast Ethernet 0/1?
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| 21. | A router that is not configured for 802.1Q is connected to interface 0/1 of the Catalyst 2950. The router interface forwards a voice-media packet to the switch. What CoS value will the switch receive?
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| 22. | A router that is not configured for 802.1Q is connected to interface 0/1 of the Catalyst 2950. The switch is configured to trust CoS on this interface. The router interface forwards a voice-media packet to the switch. What DSPC value will the switch use for this packet by default?
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| 23. | What can MQC be used for on the Catalyst 2950?
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| 24. | What is a class map used for?
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| 25. | What is a policy map used for?
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| 26. | How is a policy map applied to an interface?
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| 27. | In which direction can a service policy be applied on a Catalyst 2950?
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| 28. | How many ingress queues are present on each Ethernet interface of the Catalyst 2950?
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| 29. | How many egress queues are present on each Ethernet interface of the Catalyst 2950?
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| 30. | What scheduling methods are supported on the Catalyst 2950?
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| 31. | What mark does the Catalyst 2950 use to determine the proper queue for a packet?
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| 32. | Which scheduling method is configured by default on a Catalyst 2950?
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| 33. | Which scheduling method is recommended for networks that transport IP telephony traffic?
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| 34. | How does strict priority scheduling work?
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| 35. | What are the advantages and disadvantages of using strict priority scheduling?
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| 36. | How does Weighted Round Robin scheduling work?
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| 37. | What are the advantages and disadvantages of WRR scheduling?
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| 38. | How does strict priority queuing work?
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| 39. | What queue is configured for the strict priority queue when using strict priority queuing?
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| 40. | What command assigns a CoS value of 5 to queue 4?
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| 41. | What command assigns WRR scheduling with queue 1 servicing 5 packets, queue 2 servicing 10 packets, queue 3 servicing 25 packets, and queue 4 servicing 50 packets?
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| 42. | What command enables the strict priority queue when using strict priority queuing?
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| 43. | What command verifies that queue 4 has been configured for the priority queue?
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| 44. | What is a policer?
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| 45. | What is out of profile or nonconforming traffic?
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| 46. | What can a policer do with nonconforming traffic on a Catalyst 2950?
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| 47. | How many policers can be applied to a single 10/100 Ethernet interface on a Catalyst 2950? How about a Gigabit interface on a Catalyst 2950?
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| 48. | What is the maximum burst size that a policer can use for a 10/100 interface on a Catalyst 2950?
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| 49. | What is the maximum burst size that a policer can use for a Gigabit interface on a Catalyst 2950?
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| 50. | What is the minimum traffic rate that a policer can use for conforming traffic for a 10/100 interface on a Catalyst 2950?
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| 51. | What is the minimum traffic rate that a policer can use for conforming traffic for a Gigabit interface on a Catalyst 2950?
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| 52. | What commands enables AutoQoS on the Catalyst 2950?
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| 53. | Where are the auto qos voip trust and auto qos voip cisco-phone commands applied?
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| 54. | What does the command auto qos voip trust do?
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| 55. | What does the command auto qos voip cisco-phone do?
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| 56. | When is configuring trust manually preferred over AutoQoS?
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| 57. | When AutoQoS is enabled, what CoS values are mapped to queue 1? What percentage of the WRR scheduler does queue 1 receive?
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| 58. | When AutoQoS is enabled, what CoS values are mapped to queue 2? What percentage of the WRR scheduler does queue 2 receive?
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| 59. | When AutoQoS is enabled, what CoS values are mapped to queue 3? What percentage of the WRR scheduler does queue 3 receive?
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| 60. | When AutoQoS is enabled, what CoS values are mapped to queue 4? What percentage of the WRR scheduler does queue 4 receive?
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| 61. | What command can you use to verify AutoQoS?
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