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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: PHY Layers and Technologies | 10% | - 802.11 physical layer standards - Channelization and frequency usage - Modulation and coding schemes - PHY layer troubleshooting |
| Topic 2: Protocol Analysis | 15% | - Analysis tools and methods - Protocol analysis fundamentals - Capture and decode process - Troubleshooting using protocol data |
| Topic 3: WLAN Medium Access | 10% | - Contention and coordination functions - Medium access performance analysis - Medium access related issues - CSMA/CA and medium access rules |
| Topic 4: 802.11 Frame Exchanges | 30% | - Data transfer and protection mechanisms - Association and authentication processes - Frame exchange sequences - Frame exchange troubleshooting |
| Topic 5: Spectrum Analysis | 10% | - Troubleshooting RF issues - Spectrum analysis tools - Interference detection and classification - RF spectrum fundamentals |
| Topic 6: MAC Sublayer and Functions | 25% | - QoS and power management - MAC frame formats and types - MAC addressing and operations - MAC layer troubleshooting |
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NEW QUESTION # 84
What does the value of the Listen Interval field in an Association Request frame indicate?
Answer: D
Explanation:
The value of the Listen Interval field in an Association Request frame indicates how often a STA in power save mode wakes up to listen to Beacon frames. The Listen Interval is expressed in units of Beacon Intervals (typically 100 TU or 102.4 ms). For example, if the Listen Interval is set to 10, it means that the STA will wake up every 10 Beacon Intervals (or about 1 second) to check for buffered frames at the AP. The Listen Interval is used by the AP to determine how long it can hold frames for a STA in power save mode before discarding them . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 197; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 198.
NEW QUESTION # 85
What is encrypted within the third message of the 4-Way Handshake?
Answer: B
Explanation:
The GTK (Group Temporal Key) is encrypted within the third message of the 4-Way Handshake. The 4-Way Handshake is a process that establishes a secure connection between a STA (station) and an AP (access point) using WPA2 (Wi-Fi Protected Access 2), which is a security protocol that uses AES-CCMP (Advanced Encryption Standard-Counter Mode CBC-MAC Protocol) as its encryption algorithm. The 4-Way Handshake consists of four messages that are exchanged between the STA and the AP. The first message is sent by the AP to the STA, containing the ANonce (Authenticator Nonce), which is a random number generated by the AP. The second message is sent by the STA to the AP, containing the SNonce (Supplicant Nonce), which is a random number generated by the STA, and the MIC (Message Integrity Code), which is a value that verifies the integrity of the message. The third message is sent by the AP to the STA, containing the GTK, which is a key that is used to encrypt and decrypt multicast and broadcast data frames, and the MIC. The GTK is encrypted with the KEK (Key Encryption Key), which is derived from the PTK (Pairwise Temporal Key).
The PTK is a key that is used to encrypt and decrypt unicast data frames, and it is derived from the PMK (Pairwise Master Key), the ANonce, and the SNonce. The fourth message is sent by the STA to the AP, containing only the MIC, to confirm the completion of the 4-Way Handshake. The other options are not correct, as they are not encrypted within the third message of the 4-Way Handshake. The PMK is a key that is derived from a passphrase or obtained from an authentication server, and it is not transmitted in any message of the 4-Way Handshake. The PTK is a key that is derived from the PMK, the ANonce, and the SNonce, and it is not transmitted in any message of the 4-Way Handshake. The GMK (Group Master Key) is a key that is generated by the AP and used to derive the GTK, and it is not transmitted in any message of the 4-Way Handshake. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 8: Security Analysis, page 211-213
NEW QUESTION # 86
After a successful 802.11ac network deployment you are performing a packet capture and notice many RTS/CTS frames in your trace file regardless of the AP or BSS. Which of the following is the most likely reason for these RTS/CTS frames?
Answer: B
Explanation:
In 802.11ac networks, RTS/CTS frames often appear due to protection mechanisms like RTS/CTS or CTS-to-Self being enabled to maintain coexistence with legacy devices or mixed- mode networks. This ensures that high-throughput frames are transmitted without collisions.
NEW QUESTION # 87
How does a VoIP Phone, using WMM Power Save, request data frames buffered at the AP?
Answer: C
Explanation:
With WMM Power Save (U-APSD), a VoIP phone retrieves buffered frames by sending a trigger frame, which is typically a QoS Null or QoS Data frame. This uplink QoS frame signals the AP to release buffered downlink frames for the corresponding access category, enabling efficient delivery of voice traffic while conserving power.
NEW QUESTION # 88
You have been recently hired as the wireless network administrator for an organization spread across seven locations. They have deployed more than 100 APs, but they have not been managed in either an automated or manual process for more than 18 months.
Given this length of time, what is one of the first things you should evaluate from a support perspective?
Answer: C
NEW QUESTION # 89
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