Wireless Questions 2- Troubleshooting Questions

Assuming the WLC’s interfaces are not in the same subnet as the RADIUS server, which interface would the WLC use as the source for all RADIUS-related traffic?

• A.the interface specified on the WLAN configuration

• B.the controller virtual interface

• C.the controller management interface

• D.any interface configured on the WLC

Answer explanation

The WLC uses the interface specified on the WLAN configuration as the source for RADIUS traffic when its interfaces are not in the same subnet as the RADIUS server. Thus, the correct answer is A.

What is calculated using the numerical values of the transmitter power level, cable loss and antenna gain?

• • A. dBi

• • B. SNR

• • C. EIRP

• • D. RSSI

Answer explanation

EIRP (Effective Isotropic Radiated Power) is calculated using the transmitter power level, cable loss, and antenna gain. It represents the total power radiated by an antenna in a specific direction, making C the correct choice.

Which access point mode allows a supported AP to function like a WLAN client would, associating and identifying client connectivity issues?

• • A. sniffer mode

• • B. client mode

• • C. sensor mode

• • D. SE-connect mode

Answer explanation

Sensor mode allows an access point to operate like a WLAN client, enabling it to associate with the network and identify client connectivity issues effectively. This distinguishes it from other modes.

Wireless users report frequent disconnections from the wireless network. While troubleshooting a network engineer finds that after the user a disconnect, the connection reestablishes automatically without any input required. The engineer also notices these message logs.

• • A. increase the AP heartbeat timeout

  
  

• • B. enable coverage hole detection

  
  

• C. increase the dynamic channel assignment interval
  

• • D. increase BandSelect

  
  

Answer explanation

Increasing the dynamic channel assignment interval can help reduce disconnections by allowing the access point to better manage channel changes, thus improving overall connectivity for wireless users.

Why is an AP joining a different WLC than the one specified through option 43?

• • A. The WLC is running a different software version

• • B. The AP multicast traffic unable to reach the WLC through Layer 3

• • C. The APs broadcast traffic is unable to reach the WLC through Layer 2

• • D. The AP is joining a primed WLC

Answer explanation

The correct answer is D. An AP may join a primed WLC if it has been configured to do so, allowing it to connect to a different controller than specified in option 43, regardless of other factors.

What does the LAP send when multiple WLCs respond to the CISCO-CAPWAP-CONTROLLER.localdomain hostname during the CAPWAP discovery and join process?

• • A. Unicast discovery request to the first WLC that resolves the domain name

• • B. unicast discovery request to each WLC

• • C. broadcast discover request

• • D. join request to all the WLCs

Answer explanation

The LAP sends a unicast discovery request to each WLC that responds to the hostname. This allows the LAP to establish a connection with all available controllers, making option B the correct choice.

Which type of antenna does the radiation pattern represent?

• A. Yagi
  

• • B. directional patch

  
  

• • C. omnidirectional

  
  

• • D. multidirectional

  
  

Answer explanation

The radiation pattern of a Yagi antenna is characterized by a strong directional gain, typically with a narrow beamwidth. This distinguishes it from omnidirectional and other types, confirming that the correct answer is A. Yagi.

A client device roams between access points located on different floors in an atrium. The access points joined to the same controller and configuration in local mode. The access points are in different IP addresses, but the client VLAN in the group same. What type of roam occurs?

• • A. intra-controller

• • B. inter-subnet

• • C. inter-controller

• • D. intra-VLAN

Answer explanation

The roam is classified as intra-controller because the client device is moving between access points that are managed by the same controller, despite being on different floors and having different IP addresses.

Which DHCP option helps lightweight APs find the IP address of a wireless LAN controller?

• • A. Option 60

• • B. Option 43

• • C. Option 150

• • D. Option 67

Answer explanation

Option 43 is used by lightweight APs to discover the IP address of a wireless LAN controller. It provides the necessary information for the APs to locate and communicate with the controller.

When a wireless client roams between two different wireless controllers, a network connectivity outage is experience for a period of time. Which configuration issue would cause this problem?

• • A. Not all of the controllers within the mobility group are using the same virtual interface IP address

• • B. All of the controllers in the mobility group are using the same mobility group name

• • C. All of the controllers within the mobility group are using the same virtual interface IP address

• • D. Not all of the controllers in the mobility group are using the same mobility group name

Answer explanation

The correct choice is A. If not all controllers in the mobility group use the same virtual interface IP address, it can lead to connectivity issues during roaming, causing outages as the client switches between controllers.