CWAP-404 Free Exam Questions & Answers PDF Updated on Jan-2025 [Q22-Q42]

CWAP-404 Free Exam Questions and Answers PDF Updated on Jan-2025

Latest CWAP-404 Exam Dumps Recently Updated 190 Questions

NEW QUESTION # 22
What is the function of 802.11 Management frames?

A. Prioritize network administration traffic
B. Manage the BSS
C. Manage the flow of data
D. Communicate configuration changes between WLAN controller and APs

Answer: B

Explanation:
The function of 802.11 management frames is to manage the BSS. A BSS (Basic Service Set) is a group of STAs (stations) that share a common SSID (Service Set Identifier) and communicate with each other through an AP (access point) or directly in an ad hoc mode. Management frames are one of the three types of 802.11 frames, along with control and data frames. Management frames are used to establish, maintain, and terminate associations between STAs and APs, as well as to advertise and discover BSSs, exchange security information, report errors, and perform other management functions. The other options are not correct, as they are not functions of
802.11 management frames. Prioritizing network administration traffic, communicating configuration changes between WLAN controller and APs, and managing the flow of data are functions of other types of frames or protocols.

NEW QUESTION # 23
When would you expect to see a Reassociation Request frame?

A. Every time a STA associates to an AP to which it has previously been associated
B. Only when a STA roams back to an AP it has previously been associated with
C. Every time a STA roams
D. Only when a STA is using FT roaming

Answer: C

Explanation:
A Reassociation Request frame is sent every time a STA roams from one AP to another within the same ESS. A Reassociation Request frame is similar to an Association Request frame, but it also contains the BSSID of the current AP that the STA is leaving. This allows the new AP to coordinate with the old AP and transfer the STA's context information, such as security keys, QoS parameters, and buffered frames. This way, the STA can maintain its connectivity and session continuity during roaming.

NEW QUESTION # 24
What must occur before an HT STA operating in an EDCA BSS can transmit a data frame over the wireless medium? (Choose 3)

A. Its NAV must be equal to one.
B. Its CCA must report that the medium is idle.
C. The AP must issue the STA a TXOP.
D. The STA must receive a BlockAck, resetting the NAV to zero.
E. The backoff timer for the AC must equal zero.
F. The appropriate interframe space must expire.

Answer: B,E,F

NEW QUESTION # 25
You are troubleshooting problems with DHCP in relation to lightweight APs. They vendor class identifier (VCI) is not specified in the DHCP server. When you contact vendor support, they inform you that it is not necessary.
When is this information true?

A. When only one AP exists on the subnet
B. When only one client option 43 value is required
C. When the DHCP server is directly connected to the subnet
D. When only one client option 60 value is required

Answer: B

NEW QUESTION # 26
You have received reports of performance problems in a BSS. One specific user is indicating that her downloads are taking a very long time compared to other users around her.
You want to determine if the AP is sending frames multiple times to get through to the user's computer.
Where should you monitor with the protocol analyzer to see retries from the AP in this scenario?

A. Very near the client STA
B. Directly in the middle of the AP and client STA
C. Very near the AP
D. Capture from another AP in another BSS

Answer: C

NEW QUESTION # 27
VoIP is used heavily in your organization.
You must troubleshoot problems with dropped calls on the WLAN.
What is a common cause of dropped calls when using Wi-Fi VoIP phones?

A. Use of WMM
B. Data rates below 54 Mbps
C. Data rates below 75 Mbps
D. Slow roaming

Answer: D

NEW QUESTION # 28
Which one of the following statements is not true concerning DTIMs?

A. Every Beacon frame must contain a DTIM
B. DTIM stands for Delivery Traffic Indication Map
C. Buffered Broadcast and Multicast traffic will be transmitted following a DTIM
D. The DTIM interval can dictate when an STA will wake up to listen to beacon frames

Answer: A

Explanation:
Explanation
Every Beacon frame must contain a DTIM is not a true statement concerning DTIMs. DTIM stands for Delivery Traffic Indication Message, and it is a subfield within the TIM (Traffic Indication Map) element in a Beacon frame. The DTIM indicates how many Beacon frames (including the current one) will appear before the next DTIM. For example, if the DTIM interval is set to 3, it means that every third Beacon frame will contain a DTIM. Buffered broadcast and multicast traffic will be transmitted following a DTIM, so that STAs in power save mode can wake up and receive them. The DTIM interval can also dictate when an STA will wake up to listen to Beacon frames, as some STAs may choose to only listen to Beacon frames that contain a DTIM . References: CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter
6: MAC Sublayer Frame Exchanges, page 200; CWAP-404 CertifiedWireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 201.

NEW QUESTION # 29
Which statement accurately describes IEEE 802.11 Power Save operation in a Basic Service Set that does not support the QoS facility?

A. After waking from a low power state, client stations listen for the next Beacon to determine if sending a PS-Poll frame to the access point is necessary.
B. Upon receiving traffic for a dozing station, the access point wakes the client station using a PS- Poll frame so that the client station can receive the data.
C. When the access point's buffer is full, the access point wakes all client stations using a PS-Poll frame so that they can receive the data.
D. Following a period of time in a low power state, client stations wake themselves and automatically poll the access point for traffic using a PS-Poll frame.
E. After waking at a scheduled TBTT, client stations send Null Function frames to the access point with the Power Management bit set back to zero.

Answer: A

NEW QUESTION # 30
What is the default 802.11 authentication method for a STA when using Pre-RSNA?

A. 4-Way Handshake
B. Shared Key
C. PSK
D. Open System

Answer: D

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.

NEW QUESTION # 31
Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?

A. Interview the network manager about the issues being experienced
B. Obtain detailed -knowledge of the wireless vendors debug and logging options
C. Talk to the end users about their experiences
D. Observe the problem

Answer: D

Explanation:
Explanation
Observing the problem is the most important step in the WLAN troubleshooting methodology among those listed. This step involves capturing and analyzing the relevant data from the wireless network, such as packets, frames, spectrum, and performance metrics. Observing the problem helps to verify the existence and scope of the issue, identify the root cause and possible solutions, and validate the results of any actions taken. The other steps are also important, but they are not as critical as observing the problem12 References:
CWAP-404 Study Guide, Chapter 1: Troubleshooting Methodology, page 15
CWAP-404 Objectives, Section 1.2: Observe the problem

NEW QUESTION # 32
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 # 33
Given: Adjacent Channel Interference (ACI) can cause frame corruption and poor performance in WLANs. You are using a protocol analyzer in the attempt to detect ACI.
What should you look for in such a scenario?

A. Look for frames with a low signal strength value in the radio tap header
B. Look at Retry counts
C. Capture on the channel you think may be impacted by ACI and see if any frames are captured from adjacent channels
D. Look at CRC errors

Answer: C

NEW QUESTION # 34
Given the IEEE 802.11 Beacon frame decode shown, determine which statement is definitively true.

A. The access point has both 1 Mbps and 2 Mbps configured as basic rates.
B. The SSID value in this Beacon is null.
C. ERP mobile stations must use the RTS/CTS protocol before Data transmissions.
D. This Beacon frame came from an ERP or HT access point.
E. The access point is operating on channel 3.

Answer: D

NEW QUESTION # 35
What Interframe space would be expected between a CTS and a Data frame?

A. SIFS
B. PIFS
C. AIFS
D. DIFS

Answer: A

Explanation:
The interframe space that would be expected between a CTS (Clear to Send) and a Data frame is SIFS (Short Interframe Space). A SIFS is the shortest interframe space that is used for high- priority transmissions, such as ACKs (Acknowledgements), CTSs, or data frames that are part of a fragmentation or aggregation process. A SIFS is a fixed value that depends on the PHY type and channel width. A CTS and a Data frame are part of a virtual carrier sense mechanism called RTS/CTS (Request to Send/Clear to Send), which is used 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 after waiting for a SIFS, followed by an ACK frame from the receiver after another SIFS. The other options are not correct, as they are not used between a CTS and a Data frame. A PIFS (PCF Interframe Space) is used for medium access by the PCF (Point Coordination Function), which is an optional and rarely implemented polling-based mechanism that provides contention-free service for time-sensitive traffic. An AIFS (Arbitration Interframe Space) is used for medium access by different ACs (Access Categories), which are logical queues that correspond to different QoS (Quality of Service) levels for different types of traffic. An AIFS is a variable interframe space that depends on the AIFSN (Arbitration Interframe Space Number) value of each AC. A DIFS (Distributed Interframe Space) is used for medium access by the DCF (Distributed Coordination Function), which is the default and mandatory contention-based mechanism that provides best-effort service for normal traffic.

NEW QUESTION # 36
Which one of the following is an advantage of using display filters that is not an advantage of capture-time filters?

A. They allow for focused analysis on just the packets of interest
B. They only hide the packets from view and the filtered packets can be enabled for view later
C. Multiple of them can be applied simultaneously
D. Once created they are reusable for later captures

Answer: B

Explanation:
Explanation
Display filters are applied after the capture is completed and they only hide the packets from view. The filtered packets are still present in the capture file and can be enabled for view later by changing or removing the display filter. This is an advantage over capture-time filters, which discard the packets that do not match the filter criteria and cannot be recovered later34 References:
CWAP-403 Study Guide, Chapter 2: Protocol Analysis, page 37
CWAP-403 Objectives, Section 2.3: Apply display filters

NEW QUESTION # 37
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?

A. In the Ethernet header on the wired port of the access point
B. In the Frame Control field of the MPDU header
C. In the Sequence Control field of the MSDU
D. In the Beacon Management frame's Capabilities fixed field
E. In the PLCP header's Service field

Answer: A

NEW QUESTION # 38
What types of wireless systems are illustrated?

A. A Bluetooth v2.0 file transfer and a 40 MHz HT AP on channels 11, 7 (primary, secondary)
B. A 2.4 GHz cordless phone on channel 14 and a wireless RFID reader
C. An ERP IEEE 802.11 system using channel 6 and Bluetooth v1.2 discovery
D. An 802.11 HR/DSSS system using channel 2 and a digital FHSS phone

Answer: C

NEW QUESTION # 39
Which one of the best following is an advantage of using display filters instead of capture-time filters?

A. Display filters allow for focused analysis on just the packets of interest
B. Multiple display filters can be applied simultaneously
C. Once created display filters are reusable for later captures
D. Display filters only hide the packets from view and the filtered packets can be enabled for view later

Answer: A

Explanation:
display filters allow you to focus on things of interest and to ignore things you don't care about.
Reference: https://searchnetworking.techtarget.com/tip/How-to-manage-Wireshark-display-filters

NEW QUESTION # 40
The Retry subfield is found in which IEEE 802.11 frame field?

A. QoS Control field
B. Protocol Order field
C. Sequence Control field
D. Frame Control field
E. MAC Service Data Unit field
F. Data Control field

Answer: D

NEW QUESTION # 41
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?