CWAP-403 Online Practice Questions and Answers

You have installed a new 802.11ac WLAN configured with 80 MHz channels. Users in one area are complaining about poor performance. This area is currently served by a single AP. You take a spectrum analysis capture in the poor performing area. While examining the waterfall plot you notice the airtime utilization is higher on the first 20 MHz of the 80 MHz channel when compared to the rest of the channel. What do you conclude?

A. The AP is misconfigured and needs to be reconfigured to 80MHz operation

B. RRM is enabled and has dynamically picked a 20 MHz channel

C. The first 20 MHz is the AP's primary channel and higher airtime utilization on the primary channel is normal when an AP Is configured for 80 MHz operation

D. Non Wi-Fi interference is preventing the APs 80 MHz operation

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. Talk to the end users about their experiences

C. Observe the problem

D. Obtain detailed knowledge of the wireless vendors debug and logging options

Protocol analyzers may present field values in either binary, decimal or hexadecimal. What precedes a hexadecimal value to indicate it is hexadecimal?

A. 0x

B. %

C. HEX

D. 16x

What Interframe space would be expected between a CTS and a Data frame?

A. SIFS

B. DIFS

C. AIFS

D. PIFS

How does a VoIP Phone, using WMM Power Save, request data frames buffered at the AP?

A. The VoIP phone transmits a PS-Poll frame

B. The VoIP phone transmits a trigger frame

C. The VoIP phone sets the More Data bit in the MAC Header to 1

D. The VoIP phone The VoIP transmits a WMM Action frame

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 BSSISs of your customers APs and the destination address is FF:FF:FF:FF:FF:FF:FF. What do you conclude from this troubleshooting exercise?

A. The customer should replace all their Bluetooth wireless mice as they are stopping the users on floor 5 from connecting to the wireless network

B. 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

C. The customers APs are misbehaving and a technical support case should be open with the vendor

D. The CCI from the APs on the floor 4 is the problem and you need to ask the tenant below to turn down their AP's Tx power

What is an AIFS?

A. A form of aggregation performed at the PLCP sub-layer

B. The shortest period of time a STA can sleep

C. A medium access method introduced by 802.11n, but never implemented

D. A variable Interframe Space introduced by802.11e to help prioritize medium access for different Access Categories

You are performing a multiple adapter channel aggregation capture to troubleshoot a VoIP roaming problem and would like to measure the roaming time from the last VoIP packet sent on the old AP's channel to the first VoIP packet sent on the new AP's channel. Which timing column in the packet view would measure this for you?

A. Delta

B. Absolute

C. Roaming

D. Relative

When configuring a long term, forensic packet capture and saving all packets to disk which of the following is not a consideration?

A. Total capture storage space

B. Individual trace file size

C. Real-time packet decodes

D. Analyzer location

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?

A. HT Protection Element

B. HT Information Element

C. HT Operation Element

D. Non-HT Present Element