"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 12-question quiz, derived from the major sections in the "Foundation Topics" section of this chapter, helps you determine how to spend your limited study time.
Table 2-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.
Table 2-1. "Do I Know This Already?" Foundation Topics Section-to-Question MappingFoundation Topics Section Covering These Questions | Questions | Score |
|---|
QoS Tools | 14 | | Classifying Using Flows or Service Classes | 56 | | The Differentiated Services QoS Model | 711 | | The Integrated Services QoS Model | 12 | | Total | |
Caution
The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know the answer to a question or are only partially sure of the answer, mark this question wrong for purposes of the self-assessment. Giving yourself credit for an answer you correctly guess skews your self-assessment results and might provide you with a false sense of security.
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:
- 10 or less overall score Read the entire chapter. This includes the "Foundation Topics," the "Foundation Summary," and the "Q&A" sections.
- 11 or 12 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, proceed to the next chapter.
QoS Tools Questions
| 1. | Which of the following are not Queuing tools?
| | 2. | Which of the following tools monitors the rate at which bits are sent out an interface?
| | 3. | Which of the following tools can mark IP packet's DSCP field?
| | 4. | Which of the following tools chooses to discard packets even though the router either has memory to queue the packets, or available physical bandwidth to send the packets?
|
Classifying Using Flows or Service Classes Questions
| 5. | Which of the following are not used to identify a flow?
TCP acknowledgment number
| | 6. | Which of the following are likely places at which to mark packets in a network using good QoS design practices?
As close to the client as possible without allowing end users to mark packets As packets enter an SP from a customer network As packets enter the LAN switch to which the destination host is attached
|
The Differentiated Services QoS Model Questions
| 7. | What does DSCP stand for?
Diffserv Static Code Point Diffserv Standardized Configuration Process Differentiated Services Code Point Differentiated Services Configuration Point
| | 8. | According to the DiffServ, which PHB defines a set of three DSCPs in each service class, with different drop characteristics for each of the three DSCP values?
| | 9. | Which of the following is true about the location of DSCP?
High order 6 bits of ToS byte Low order 6 bits of ToS byte Middle 6 bits of ToS byte High order 5 bits in ToS byte
| | 10. | Imagine a packet is marked with DSCP CS3. Later, a QoS tool classifies the packet. Which of the following classification criteria would match the packet, assuming the marking had not been changed from the original CS3 marking?
| | 11. | Imagine a packet is marked with AF31. Later, a QoS tool classifies the packet. Which of the following classification criteria would match the packet, assuming the marking had not been changed from the original AF31 marking?
|
The Integrated Services QoS Model Questions
| 12. | Which of the following are reasons why IntServ does not scale as well as DiffServ?
Keeps flow state on each node Requires complex configuration for matching criteria for each possible flow Continuous signaling to maintain QoS reservation
|
 |
