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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: 802.11 Frame Exchanges | 30% | - Frame exchange sequences - Data transfer and protection mechanisms - Frame exchange troubleshooting - Association and authentication processes |
| Topic 2: WLAN Medium Access | 10% | - CSMA/CA and medium access rules - Medium access performance analysis - Medium access related issues - Contention and coordination functions |
| Topic 3: MAC Sublayer and Functions | 25% | - QoS and power management - MAC addressing and operations - MAC frame formats and types - MAC layer troubleshooting |
| Topic 4: Spectrum Analysis | 10% | - Troubleshooting RF issues - RF spectrum fundamentals - Spectrum analysis tools - Interference detection and classification |
| Topic 5: PHY Layers and Technologies | 10% | - 802.11 physical layer standards - Modulation and coding schemes - Channelization and frequency usage - PHY layer troubleshooting |
| Topic 6: Protocol Analysis | 15% | - Protocol analysis fundamentals - Capture and decode process - Analysis tools and methods - Troubleshooting using protocol data |
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NEW QUESTION # 119
Which one of the following portions of information is communicated by bits in the PHY Header?
Answer: D
Explanation:
One of the information that is communicated by bits in the PHY header is data rate. Data rate is the speed at which data is transmitted or received over the wireless medium. Data rate depends on factors such as modulation, coding, channel width, spatial streams, and guard interval. Data rate is indicated by bits in different fields of the PHY header, depending on the type of PPDU (e.g., OFDM, HT, VHT, HE). The receiver uses these bits to determine how to decode and demodulate the rest of the PPDU. The other options are not correct, as they are not communicated by bits in the PHY header. SNR (Signal-to-Noise Ratio), noise, and signal strength are measured by the receiver based on its own capabilities and environment. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 4: 802.11 Physical Layer, page 101-105
NEW QUESTION # 120
Which one of the statements regarding the Frame Control field in an 802.11 MAC header is true?
Answer: B
Explanation:
The statement that the Frame Control field contains subfields, and some 1-bit flags is true. The Frame Control field is a 2-byte field in the MAC header that contains information about the type, subtype, and characteristics of a frame. The Frame Control field is divided into several subfields, each with a specific function and length.
Some of these subfields are 1-bit flags, which can be set to 0 or 1 to indicate a certain condition or status. For example, the To DS and From DS subfields are 1-bit flags that indicate whether a frame is destined for or originated from the DS (Distribution System). The other statements are not true, as they do not describe the Frame Control field correctly. All types of frames (management, control, and data) have a Frame Control field, not just control frames. The Frame Control field is not used to communicate the duration value, which is a separate field in the MAC header. The Frame Control field is not always set to 0, as it varies depending on the type, subtype, and characteristics of each frame. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 113-114
NEW QUESTION # 121
You are troubleshooting a connection problem with a client STA. Regardless of the AP to which it attempts to connect, the connection fails. Using a wired protocol analyzer, you determine that the problem is with the
802.1X/EAP authentication to the RADIUS server.
What layer or range of layers of the OSI model revealed this information?
Answer: B
NEW QUESTION # 122
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: C
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 # 123
Many access points support IEEE 802.1Q VLAN tagging. When analyzing a WLAN system using IEEE 802.1Q tags, where can the VLAN tag number be seen?
Answer: D
NEW QUESTION # 124
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