CWS Wireless Security & Troubleshooting Techniques 3

Question 1

Which troubleshooting step BEST isolates whether a wireless performance problem is caused by RF interference versus AP configuration?

Accepted Answer

Connect the same client to the AP via Ethernet and compare throughput

Answer

Comparing wired vs. wireless throughput from the same client and AP location isolates whether the issue is in the RF medium or the AP/network configuration.

Question 2

What does a high 'retry rate' in an AP's statistics indicate?

Accepted Answer

Poor RF conditions or interference causing frame retransmissions

Answer

A high retry rate means the AP or client is frequently retransmitting frames, which typically points to RF issues such as low SNR or interference.

Question 3

A WLAN client receives an IP via DHCP but cannot reach the internet. Other wireless clients on the same SSID work fine. What is the FIRST thing to check?

Accepted Answer

The client's IP address, subnet mask, default gateway, and DNS settings

Answer

Verifying the client's IP configuration ensures it received correct network parameters; a misconfigured DHCP scope or static IP conflict could affect only that client.

Question 4

Which attack involves the attacker capturing the WPA2 four-way handshake and then running an offline dictionary attack?

Accepted Answer

PSK brute-force via captured handshake

Answer

By capturing the four-way handshake, an attacker can test pre-shared key candidates offline without needing to stay on the network.

Question 5

KRACK (Key Reinstallation Attack) targets which phase of the WPA2 connection process?

Accepted Answer

The four-way handshake nonce reinstallation

Answer

KRACK manipulates retransmissions in the four-way handshake to force nonce reuse, weakening the encryption key.

(CWS) Certified Wireless Specialist Practice Test

(CWS) Certified Wireless Specialist Practice Test

CWS Wireless Security & Troubleshooting Techniques 3