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| Section | Objectives |
|---|---|
| Topic 1: RF and PHY Layer Analysis | - Channelization and Spectrum Usage - RF Propagation and Signal Behavior - 802.11 PHY Standards Overview |
| Topic 2: Wireless Troubleshooting and Performance Analysis | - Identifying WLAN Performance Issues - Throughput and Latency Analysis - Common WLAN Failure Scenarios |
| Topic 3: WLAN Protocol Analysis | - MAC Layer Operations and Behaviors - 802.11 Frame Structure and Fields - Frame Types and Exchanges (Management, Control, Data) |
| Topic 4: Spectrum Analysis and Tools | - Wireshark and Packet Capture Analysis - Spectrum Analyzer Usage - Interference Identification (Wi-Fi and Non-Wi-Fi) |
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NEW QUESTION # 48
How is the length of an AIFS calculated?
Answer: D
Explanation:
The length of an AIFS (Arbitration Interframe Space) is calculated by multiplying the AIFSN (Arbitration Interframe Space Number) by the Slot Time and adding the SIFS (Short Interframe Space). An AIFS is a variable interframe space introduced by 802.11e to help prioritize medium access for different Access Categories (ACs). An AC is a logical queue that corresponds to a QoS (Quality of Service) level for different types of traffic. Each AC has a different AIFSN value, which determines how long it has to wait before attempting to access the medium. A lower AIFSN value means a higher priority and a shorter waiting time.
The Slot Time is a fixed value that depends on the PHY type and channel width. The SIFS is the shortest interframe space that is used for high-priority transmissions, such as ACKs or CTSs. The formula for calculating the AIFS length is: AIFS = AIFSN * Slot Time + SIFS. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7: QoS Analysis, page 194-195
NEW QUESTION # 49
After performing a protocol analysis capture on channel 36 you are looking at the radio tap header of a data frame and notice the frame was transmitted at MCS 0 on one spatial stream. At what data rate was the PHY Header for this frame transmitted?
Answer: B
Explanation:
On channel 36 (5 GHz band), the PHY header is always transmitted using one of the basic OFDM rates to ensure all devices can decode it. For 802.11a/n/ac in 5 GHz, the PHY header is sent at 6 Mbps, regardless of the MCS rate used for the data portion of the frame.
NEW QUESTION # 50
As a wireless network consultant you have been called in to troubleshoot a high-priority issue for one of your customers. The customer's office is based on two floors within a multi-tenant office block. On one of these floors (floor 5) users cannot connect to the wireless network. During their own testing the customer has discovered that users can connect on floor 6 but not when they move to the floor 5. This issue is affecting all users on floor 5 and having a negative effect on productivity.
To troubleshoot this issue, you perform both Spectrum and Protocol Analysis. The Spectrum Analysis shows the presence of Bluetooth signals which you have identified as coming from wireless mice. In the protocol analyzer you see the top frame on the network is Deauthentication frames. On closer investigation you see that the Deauthentication frames' source addresses match the BSSIDs of your customers APs and the destination address is FF:FF:FF:FF:FF:FF:FF.
What do you conclude from this troubleshooting exercise?
Answer: B
Explanation:
A high volume of Deauthentication frames sent to the broadcast destination address forces all nearby clients to disconnect and prevents new associations, which is a classic denial-of-service condition at the 802.11 management layer. Because the source addresses are spoofed to match the AP BSSIDs and the impact is localized to one floor, this strongly points to an external device/system transmitting forged deauthentication traffic in that area, commonly caused by a misconfigured wireless intrusion prevention system or similar containment feature operated by another tenant.
NEW QUESTION # 51
802.11k Neighbor Requests and Neighbor Reports are sent in what type of Management Frames?
Answer: A
Explanation:
802.11k Neighbor Requests and Neighbor Reports are sent in Action frames. An Action frame is a Management frame that is used to perform various operations or functions related to the operation or maintenance of a wireless network. An Action frame consists of a Category field that indicates the type of action being performed, and a variable-length Action Details field that contains specific information related to the action. For example, an Action frame with a Category field value of 5 indicates a Radio Measurement action, and the Action Details field may contain a Neighbor Request or a Neighbor Report subelement .
References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6:
MAC Sublayer Frame Exchanges, page 207; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 208; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 12: 802.11k/v/r/u/w/ai Amendments, page 434.
NEW QUESTION # 52
You're the WLAN administrator for a large retailer based at the HQ in New York. The London-based office has been complaining about WLAN disconnections around lunch time each day. You suspect this might be interference from the staff microwave, how might you test your theory from the New York office?
Answer: C
Explanation:
The best way to test the theory of microwave interference from the New York office is to use a remote spectrum analyzer. By placing one of the London APs into spectrum analyzer mode, you can capture and analyze the RF spectrum in the London office over lunch time. You can then look for any signs of microwave interference, such as high duty cycle, high amplitude, or frequency hopping on the 2.4 GHz band. This method does not require any physical access to the microwave or any changes to its frequency. References: [Wireless Analysis Professional Study Guide], Chapter 3: Spectrum Analysis, page 64
NEW QUESTION # 53
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