CWS CWS WLAN Troubleshooting 2

Question 1

Which tool captures 802.11 frames for detailed protocol-level analysis?

Accepted Answer

Wireless protocol analyzer (packet sniffer)

Answer

Spectrum analyzer

Answer

Wi-Fi scanner mobile app

Answer

SNMP management console

Question 2

A wireless client can associate with the AP but cannot reach any internet resources. Pinging the default gateway succeeds. What is the most likely cause?

Accepted Answer

DNS resolution failure

Answer

WLAN security configuration mismatch

Answer

RF channel interference at the AP

Answer

AP transmit power set too low

Question 3

What does RSSI measure in a wireless network?

Accepted Answer

The relative power level of the received RF signal at the receiver

Answer

The ambient noise floor at the AP location

Answer

The data throughput of the current wireless link

Answer

The number of frame retransmissions per second

Question 4

When multiple APs in the same area are configured to use the same 802.11 channel, what problem results?

Accepted Answer

Co-channel interference (CCI) and increased contention

Answer

Adjacent channel interference (ACI)

Answer

Hidden node collisions between APs

Answer

Near/far power imbalance

Question 5

A wireless user reports slow speeds only in a specific conference room while other areas work fine. What is the most likely cause?

Accepted Answer

RF interference or poor signal coverage in that area

Answer

AP firmware bug affecting all clients

Answer

Insufficient DHCP address pool

Answer

VLAN misconfiguration on the switch

Question 6

Which of the following is a Layer 2 WLAN troubleshooting issue?

Accepted Answer

Authentication or association failure with the AP

Answer

IP address conflict between two clients

Answer

Failed DNS query to external server

Answer

Default gateway unreachable from client

Question 7

What is the purpose of conducting a post-deployment site survey for WLAN troubleshooting?

Accepted Answer

To verify that actual signal coverage and channel usage match the design

Answer

To configure SSID passwords on all APs

Answer

To update AP firmware to the latest version

Answer

To assign static IP addresses to all APs