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| Section | Objectives |
|---|---|
| RF and PHY Layer Analysis | - Channelization and Spectrum Usage - 802.11 PHY Standards Overview - RF Propagation and Signal Behavior |
| Wireless Troubleshooting and Performance Analysis | - Identifying WLAN Performance Issues - Common WLAN Failure Scenarios - Throughput and Latency Analysis |
| Spectrum Analysis and Tools | - Spectrum Analyzer Usage - Interference Identification (Wi-Fi and Non-Wi-Fi) - Wireshark and Packet Capture Analysis |
| WLAN Protocol Analysis | - 802.11 Frame Structure and Fields - Frame Types and Exchanges (Management, Control, Data) - MAC Layer Operations and Behaviors |
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NEW QUESTION # 64
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:
The users on floor 5 are being subjected to a denial of service attack, as this is happening across the entire floor it is likely to be a misconfigured WIPS solution belonging to the tenants on the floor below. This is because the Deauthentication frames have a source address that matches the BSSIDs of the customer's APs and a destination address that is a broadcast address (FF:FF:FF:FF:FF:FF). This indicates that someone is sending spoofed Deauthentication frames to all STAs associated with the customer's APs, causing them to disconnect from the wireless network. This is a common type of DoS attack on wireless networks, and it could be caused by a rogue device or a WIPS solution that is configured to protect the wireless network of another tenant on the floor below12. References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 13: Troubleshooting Common Wi-Fi Issues, page 4961; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 14: Troubleshooting Tools, page 5272.
NEW QUESTION # 65
When performing protocol analysis, you notice a high number of RTS/CTS frames being transmitted on an HT network. You suspect this may be due to HT protection mechanisms. Where in the Beacon frame would you look to determine which one of the four HT protection modes the AP is operating in?
Answer: B
Explanation:
When performing protocol analysis, you would look at the HT Information Element in the Beacon frame to determine which one of the four HT protection modes the AP is operating in. The HT Information Element contains various subfields that provide information about the HT network configuration and operation. One of these subfields is the HT Protection field, which indicates whether any protection mechanisms are required for mixed-mode operation with non-HT STAs. The four possible values for this field are:
* No Protection: No protection mechanisms are required.
* Non-member Protection: RTS/CTS or CTS-to-self protection is required for all HT transmissions.
* 20 MHz Protection: RTS/CTS or CTS-to-self protection is required for all HT transmissions using a 40 MHz channel.
* Non-HT Mixed Mode: All HT transmissions must use a non-HT preamble and header . References:
CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 11: 802.11n
/ac/ax PHYsical Layer Frame Exchanges, page 378; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 11: 802.11n/ac/ax PHYsical Layer Frame Exchanges, page 379.
NEW QUESTION # 66
An RTS frame should be acknowledged by which frame?
Answer: C
Explanation:
An RTS (Request to Send) frame should be acknowledged by a CTS (Clear to Send) frame. An RTS and CTS frame are types of control frames that are used to implement a virtual carrier sense mechanism called RTS
/CTS. RTS/CTS is a technique that helps to avoid collisions and hidden node problems in wireless transmissions. When a STA (station) wants to send a data frame, it first sends an RTS frame to the intended receiver, indicating the duration of the transmission. The receiver then responds with a CTS frame, also indicating the duration of the transmission. The other STAs in the vicinity hear either the RTS or the CTS frame and update their NAV (Network Allocation Vector) timers accordingly, deferring their access to the medium until the transmission is over. The sender then sends the data frame, followed by an ACK (Acknowledgement) frame from the receiver. The other options are not correct, as they are not used to acknowledge an RTS frame. An ACK frame is used to acknowledge a data frame, not an RTS frame. An RTS- Ack frame does not exist, as there is no such type of control frame in 802.11. A Block Ack (BA) frame is used to acknowledge multiple data frames in a single frame, not an RTS frame. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 6: 802.11 Frame Exchanges, page 166-167
NEW QUESTION # 67
What is the default 802.11 authentication method for a STA when using Pre-RSNA?
Answer: B
Explanation:
Prior to RSNA (Robust Security Network Association), the default 802.11 authentication method is Open System authentication. This method performs a simple two-frame exchange without encryption or key validation and was the standard authentication mechanism before the introduction of RSNA-based security methods such as WPA2 and WPA3.
NEW QUESTION # 68
Which Spectrum Analyzer plot visualizes the spectrum over time?
Answer: A
Explanation:
A waterfall plot displays frequency on one axis, signal strength on another, and time on the third (typically color-coded), allowing visualization of how the spectrum changes over time.
NEW QUESTION # 69
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