2026 Updated Verified CWAP-405 Downloadable Printable Exam Dumps
The Ultimate CWNP CWAP-405 Dumps PDF Review
NEW QUESTION # 66
Several users have reported WLAN network connection issues and the users connect to the same AP. These users are spread throughout a 320 square meter area. Using a spectrum analyzer, you see RF energy across the entire 2.4 GHz band at significant signal strength levels. The users all connect using either HT or ERP devices.
What is the likely cause of this problem within this area?
- A. Microwave oven
- B. Wide-band jammer
- C. Bluetooth devices
- D. Video camera
Answer: B
NEW QUESTION # 67
You suspect an interfere may exist in a BSS that is experiencing sporadic problems. You want to identify and locate the device. The actual device identify is not known.
What tool should be used for this purpose?
- A. Spectrum analyzer
- B. Protocol analyzer
- C. Throughput tester
- D. Cable tester
Answer: A
NEW QUESTION # 68
You want to simplify viewing frames of a particular type in Wireshark.
What is used to specify frames for colorization?
- A. Custom code must be written and the binaries recompiled
- B. A scripting language is available to modify the code before recompilation
- C. Automated protocol analysis is used and no additional options may be specified
- D. Filters are used to define the frames that should be colorized
Answer: D
Explanation:
Protocol analyzers also support highlighting or colorization and filtering. The highlighting feature allows you to define colors for packets or frames matching particular criteria. It allows those frames to stand out as you browse through the captured frames
NEW QUESTION # 69
You are troubleshooting a client that is experiencing slow WLAN performance. As part of the troubleshooting activity, you start a packet capture on your laptop close to the client device. While analyzing the packets, you suspect that you have not captured all packets transmitted by the client. By analyzing the trace file, how can you confirm if you have missing packets?
- A. Look for gaps in the sequence number in MAC headers.
- B. The missing packets will be shown as CRC errored packets
- C. Protocol Analyzers show the number of missing packets in their statistics view
- D. Retransmission are an indication of missing packets
Answer: A
Explanation:
One way to confirm if you have missing packets in your packet capture is to look for gaps in the sequence number in MAC headers. The sequence number is a 12-bit field in the MAC header that is used to identify and order data frames within a traffic stream. The sequence number is incremented by one for each new data frame transmitted by a STA, except for retransmissions, fragments, and control frames. The sequence number can range from 0 to 4095, and then wraps around to 0. If you see a jump or a gap in the sequence number between two consecutive data frames from the same STA, it means that you have missed some packets in between. The other options are not correct, as they do not confirm if you have missing packets in your packet capture. CRC errored packets are packets that have been corrupted during transmission and have failed the error detection check. Protocol analyzers may show the number of CRC errored packets in their statistics view, but not the number of missing packets. Retransmissions are an indication of packet loss or collision, but not necessarily of missing packets in your capture. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 114-115
NEW QUESTION # 70
After examining a Beacon frame decode you see the SSID Element has a length of 0. What do you conclude about this frame?
- A. The frame is corrupted
- B. SSID elements always have a length of 0
- C. The beacon is from a BSS configured to hide the SSID
- D. This is a common attack on WISP backend SQL databases
Answer: C
Explanation:
If the SSID element has a length of 0 in a Beacon frame decode, it means that the beacon is from a BSS configured to hide the SSID. The SSID element is a part of the Beacon frame that contains the name or identifier of the BSS. The SSID element has two fields: length and value. The length field indicates how many bytes are used for the value field, which contains the actual SSID string. If the length field is 0, it means that there is no value field or SSID string in the element. This is a common technique used by some APs to hide their SSID from passive scanning clients or potential attackers. However, this technique does not provide much security, as there are other ways to discover or reveal the hidden SSID, such as active scanning or capturing probe response or association frames. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 122-123
NEW QUESTION # 71
You are using a laptop-based protocol analyzer to scan all channels and determine the basic configuration of the WLAN Basic Service Set in your facility. You are scanning all channels. All configured with default settings.
What can you change to cause the scan to run faster while still APs are capturing beacon frames on all the channels?
- A. Configure the RBW to more than 120 kHz
- B. Configure the scan time for channels to <100 ms
- C. Configure the fragmentation threshold to 1500 bytes
- D. Configure the scan time for channels to 300-500 ms
Answer: A
NEW QUESTION # 72
You are responsible for troubleshooting and analysis of the WLAN in your organization that supports more than 700 client STAs. Forty APs are deployed and they are all dual-band APs and are controller-based. You must troubleshoot the wired side in some scenarios using a protocol analyzer.
Which one of the following problems would warrant wired-side analysis in most situations?
- A. DHCP problems
- B. High 802.11 retry rates
- C. WMM QoS issues
- D. High 802.11 CRC rates
Answer: C
NEW QUESTION # 73
Which piece of information is not transmitted in an HT PPDU header?
- A. Channel number
- B. Number of Spatial Streams
- C. MCS index
- D. PPDU length
Answer: A
Explanation:
The channel number is not transmitted in an HT PPDU header. An HT PPDU header is a part of the PPDU that contains information such as modulation, coding, data rate, and number of spatial streams for an 802.11n transmission. The channel number is not included in the HT PPDU header, as it is determined by the frequency band and channel width that are used by the transmitter and receiver. The channel number can be inferred from the frequency band and channel width, which are indicated by bits in different fields of the HT PPDU header, such as HT-SIG and HT-LTF. The other options are not correct, as they are transmitted in an HT PPDU header. The number of spatial streams, PPDU length, and MCS index are indicated by bits in the HT-SIG field of the HT PPDU header. References: [Wireless Analysis Professional Study Guide CWAP-
405], Chapter 4: 802.11 Physical Layer, page 108-109
NEW QUESTION # 74
You work as an SE for a value-added reseller. A client has an existing deployment of 802.11n Aps and wants to upgrade several BSSs to 802.11ac.
What hardware feature of some enterprise Aps may allow for this without a forklift upgrade?
- A. Simply check the Enable 802.11ac checkbox in the web-based configuration interface
- B. Adding an 802.11ac module to the existing APs
- C. Converting the 802.11n radio to an 802.11ac radio through software
- D. Replace the antennas with 802.11ac antennas
Answer: A
NEW QUESTION # 75
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?
- A. Below Layer 3
- B. Above Layer 4
- C. Layer 3
- D. Layer 2
Answer: C
NEW QUESTION # 76
What is the default 802.11 authentication method for a STA when using Pre-RSNA?
- A. Shared Key
- B. PSK
- C. Open System
- D. 4-Way Handshake
Answer: C
Explanation:
The default 802.11 authentication method for a STA when using Pre-RSNA is Open System. This is the simplest and most common authentication method, which does not provide any security or encryption. In Open System authentication, the STA sends an Authentication Request frame to the AP, and the AP responds with an Authentication Response frame with a status code of success. After this, the STA can proceed to association with the AP . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 181; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 183.
NEW QUESTION # 77
While troubleshooting DHCP issues, you perform a protocol capture in order to determine if the DNCP pool is depleted. The capture does not show DHCPnak messages.
Where else could you look to determine if the pool is depleted?
- A. AP logs
- B. DHCP server logs
- C. Switch logs
- D. Spectrum analyzer
Answer: B
Explanation:
A very common problem for WLANs is DHCP pool depletion. This occurs because many wireless clients come-and-go from the network quickly. If a client connects for only two or three minutes and the lease duration is set to multiple days (3-8 days is not uncommon), the IP address will be lost for that entire time. To resolve such issues, create more pools and reduce the lease duration to hours instead of days. Look for DHCP negative acknowledgement or server log errors to determine if the IP pool is depleted.
NEW QUESTION # 78
Which one of the following is not a valid acknowledgement frame?
- A. CTS
- B. Block Ack
- C. Ack
- D. RTS
Answer: D
Explanation:
RTS is not a valid acknowledgement frame. RTS stands for Request To Send, and it is a control frame that is used to initiate an RTS/CTS exchange before sending a data frame. The purpose of an RTS/CTS exchange is to reserve the medium for a data transmission and avoid collisions with hidden nodes. An acknowledgement frame is a control frame that is used to confirm the successful reception of a data frame or a block of data frames. The valid acknowledgement frames are CTS (Clear To Send), Ack (Acknowledgement), and Block Ack (Block Acknowledgement) . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 186; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 187; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 189; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 190.
NEW QUESTION # 79
Given a protocol analyzer can decrypt WPA2-PSK data packets providing the PSK and SSID are configured in the analyzer software. When performing packet capture (in a non-FT environment) which frames are required in order for PSK frame decryption to be possible?
- A. Probe Response
- B. 4-Way Handshake
- C. Authentication
- D. Reassociation
Answer: B
Explanation:
The 4-way handshake is the process that establishes the pairwise transient key (PTK) between the client and the AP in WPA2-PSK. The PTK is derived from the PSK, the SSID, and some random numbers exchanged in the handshake frames. The PTK is used to encrypt and decrypt the data frames between the client and the AP. Therefore, in order to decrypt WPA2-PSK data packets, a protocol analyzer needs to capture the 4-way handshake frames and have the PSK and SSID configured in the analyzer software12 References:
* CWAP-405Study Guide, Chapter 3: 802.11 MAC Layer Frame Formats and Technologies, page 87
* CWAP-405Objectives, Section 3.5: Analyze security exchanges
NEW QUESTION # 80
When a data frame is encrypted with WPA2, to which portion of the frame is the encryption applied?
- A. The whole MPDU
- B. Frame body and MAC Header
- C. Frame body excluding the LLCPD U
- D. Frame body including the LLCPDU
Answer: D
Explanation:
When a data frame is encrypted with WPA2, the encryption is applied to the frame body including the LLCPDU. The LLCPDU (Logical Link Control Protocol Data Unit) is a part of the frame body that contains information such as protocol type, source and destination service access points (SAPs), and control fields. The LLCPDU is added by the LLC (Logical Link Control) sublayer to provide multiplexing and flow control functions for different upper layer protocols. When a data frame is encrypted with WPA2, which uses AES- CCMP as its encryption algorithm, both the payload and the LLCPDU are encrypted as a single unit. The MAC header and FCS are not encrypted, as they are needed for addressing and error detection purposes. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 115-116
NEW QUESTION # 81
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