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CCNA Wireless Exam Guide: Wireless Traffic Flow and AP Discovery

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Brandon James Carroll covers Wireless Frame Transmission, Wireless Frame Headers, Frame Types, and looks at a wireless connection in preparation for CCNA exam 640-721.
This chapter is from the book

This chapter covers the following subjects:

  • Wireless Frame Transmission: A discussion of how frames are transmitted on a wireless LAN.
  • Wireless Frame Headers: A look at the headers used in wireless transmissions.
  • Frame Types: Putting together how the frame types are used in managing and connecting to a network.
  • A Wireless Connection: A look at a wireless connection.

It is not likely that in your everyday activity you will be following the flow of traffic. At least the hope is that you will not have to. On occasion, however, you will need to analyze the flow of traffic in troubleshooting network issues. For this reason and just so that you have a complete understanding of what is involved in wireless transmissions, you need to understand wireless traffic flow and the process of discovering an AP. In this chapter, you will learn how a client finds an AP, associates, and sends traffic.

You should do the “Do I Know This Already?” quiz first. If you score 80 percent or higher, you may want to skip to the section “Exam Preparation Tasks.” If you score below 80 percent, you should spend the time reviewing the entire chapter. Refer to Appendix A, “Answers to the ‘Do I Know This Already?’ Quizzes” to confirm your answers.

“Do I Know This Already?” Quiz

The “Do I Know This Already?” quiz helps you determine your level of knowledge of this chapter’s topics before you begin. Table 7-1 details the major topics discussed in this chapter and their corresponding quiz questions.

Table 7-1. “Do I Know This Already?” Section-to-Question Mapping

Foundation Topics Section

Questions

Wireless Frame Transmission

1–5

Wireless Frame Headers

6–7

Frame Types

8–12

  1. What are the three frame types seen in a wireless LAN? (Choose three.)

    1. Management
    2. Control
    3. Data
    4. Contention
  2. What type of frame is used for acknowledging receipt of data?

    1. Control
    2. Reply
    3. Null
    4. Management
  3. What frame type is used to send beacons?

    1. Control
    2. Management
    3. Informational
    4. Data
  4. To determine if the medium is in use, which of the following are used? (Choose all that apply.)

    1. CCA
    2. CAS
    3. VCA
    4. VCS
  5. Which interframe space is used for quickly sending a frame?

    1. UIFS
    2. DIFS
    3. SIFS
    4. PIFS
  6. How many MAC addresses can be present in a wireless header?

    1. 1
    2. 2
    3. 3
    4. 4
  7. Which of the following is a management frame type?

    1. Probe response
    2. ACK
    3. RTS
    4. Null function
  8. Beacons contain information to assist clients in accessing the network. Which of the following is not in a beacon?

    1. Beacon interval
    2. Capability information
    3. A reference time for the cell
    4. The WEP passphrase
  9. A client that connects by hearing a beacon is said to use what type of scanning?

    1. Passive
    2. Classic
    3. Active
    4. Fast
  10. A client that sends a probe request is said to use what type of scanning?

    1. Preemptive
    2. Dynamic
    3. Passive
    4. Active
  11. A client that sends a deauthentication message must reauthenticate when it returns to the cell. True or false?

    1. True
    2. False
  12. A client that sends a disassociation message must reauthenticate when it returns to the cell. True or false?

    1. True
    2. False
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