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CWNP
CWAP Wi-Fi Analysis
CWAP-405
Certified Wireless Analysis Professional Questions and Answers

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Questions # 1:

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?

Options:

Wide-band jammer

Microwave oven

Bluetooth devices

Video camera

Answer

Questions # 2:

The manager in the security group is concerned about compliance with security policies on the WLAN. The budget is not available for a full WIPS SOLUTION. He has asked you to implement a process that will verify compliance.

What would you recommend in such a scenario?

Options:

Use the built-in spectrum analyzer features of the APs to ensure that WPA2-Enterprise is implemented throughout the organization

Simplify enable 802.11w, which will enforce management frame compliance

Use a laptop-based protocol analyzer that provides compliance reporting to monitor the environment on a periodic basis

Implement AP-based sensors throughout the facility and then monitor for performance issues with these sensors

Answer

Questions # 3:

What element was added to the general frame of 802.11 with the 802.11e amendment and the 802.11-2007 rollup?

Options:

HT Control

Address 4

QoS Control

RSN-IE

Answer

Questions # 4:

What is the function of the PHY Preamble?

Options:

To terminate a conversation between transmitter and receiver

To set the modulation method for the MPDU

Carries the NDP used in Transmit Beamforming and MU-MIMO

Allows the receiver to detect and synchronize with the signal

Answer

Explanation

The function of the PHY preamble is to allow the receiver to detect and synchronize with the signal. The PHY preamble is a part of the PPDU that is transmitted before the PHY header and the PSDU. The PHY preamble consists of a series of training fields that help the receiver to adjust its parameters, such as frequency, timing, and gain, to match the incoming signal. The PHY preamble also helps the receiver to estimate the channel conditions and noise level. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 4: 802.11 Physical Layer, page 99-100

Questions # 5:

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

Options:

Open System

Shared Key

4-Way Handshake

PSK

Answer

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.

Questions # 6:

You are troubleshooting VoIP WLAN issues. When performing a PING to a remote device that would be involved in a call link, you see that the time value averages 220 milliseconds.

How much extra delay beyond that recommend for VoIP links is in this link?

Options:

There is not enough information because the PING command give round-trip-times

There is 70 milliseconds more delay than recommended

There is 80 milliseconds more delay than recommended

There is no extra delay beyond that recommended, instead there is 80 milliseconds less

Answer

Questions # 7:

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?

Options:

Configure the RBW to more than 120 kHz

Configure the scan time for channels to 300-500 ms

Configure the fragmentation threshold to 1500 bytes

Configure the scan time for channels to <100 ms

Answer

Questions # 8:

Recently, three rogue APs have been connected to the network and later discovered. You want to prevent future rogue AP installations as much as possible.

What is the first step to eliminating or reducing rogue APs on the network?

Options:

Use IPSec between every AP and the network infrastructure

Define a direct policy that stipulates the ramifications of installing unauthorized devices

Create a hash of the MAC addresses of all authorized devices and continually scan for non-matching hashes

Enable rogue detection in the existing authorized APs

Answer

Questions # 9:

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?