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Designing Cisco Enterprise Wireless Networks (ENWLSD) Questions and Answers

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Viewing questions 81-90 out of questions

Questions # 81:

Why is 802.11a connectivity reduced in an X-ray room?

Options:

X-rays create significant non-Wi-Fi interference on the 802.11a band.

X-rays impact the 802,11a UNll-2 channels that cause access points to dynamically change channels.

X -rays within these rooms cause multipath issues.

X-ray rooms exhibit increased signal attenuation.

Answer

Explanation

The connectivity of 802.11a, which operates in the 5 GHz band, is reduced in X-ray rooms primarily due to the increased signal attenuation caused by the lead and other dense materials used in the construction of these rooms to shield against X-ray radiation. These materials effectively block or weaken the radio signals used for wireless communication

portable X-ray machines, sending high-resolution images, sometimes in real time, echography machines, and electrocardiography [ECG] machines). These devices may also use the same spectrum as Wi-Fi but with other protocols and, therefore, become sources of interference for your system.

Questions # 82:

Refer to the exhibit. An engineer is about to establish a mobility peer connection between a Cisco Catalyst 9800-CL version 16.10.1e and Cisco AireOS 5520 version 8.8.120.0. The data path between the 9800-CL and AireOS 5520 is down, but its control path is up. Based on the configuration, what is the cause of the issue?

Options:

The certificate hash key is incorrect, which causes the data path to be down.

Encrypted mobility is being used in the 5520 configuration, which causes the data path to be down.

The data-dtl s is disabled on the AireOS 5520 WLC, which causes the data path to be down.

The data-link-encryption configuration is missing from the 9800-CL configuration.

Answer

Explanation

The data path being down while the control path is up indicates an issue with the data plane security configuration. The data-dtls setting on the AireOS 5520 WLC is responsible for enabling Datagram Transport Layer Security (DTLS) for the data plane, which encrypts the data traffic between the controllers. If this setting is disabled, the data path cannot be established securely, leading to the observed issue. Therefore, enabling data-dtls on the AireOS 5520 WLC is necessary to resolve the data path downtime.

Questions # 83:

A network engineer is configuring high availability on an access point. What is the maximum number of controllers that can be configured?

Options:

Answer

Explanation

When configuring high availability on an access point, a network engineer can configure a maximum of two controllers. One serves as the primary controller, and the other serves as the secondary controller.

Questions # 84:

Which two wireless design principles help mitigate co-channel interference? (Choose two.)

Options:

Use directional antennas

Increase AP transmit power

Use non-overlapping channels

Place APs too close together

Lower AP transmit power

Answer

C, E

Questions # 85:

A shopping mall wants to track customer movement patterns using Wi-Fi. Which Cisco solution

should you recommend?

Options:

Cisco CleanAir

Cisco DNA Spaces

Cisco Band Select

Cisco ClientLink

Answer

Questions # 86:

A community bank has three campus locations and one HO with the data center operations Each campus location has tour Cisco Catalyst 9120 APs The data center has a Catalyst 9800 WLC with eight Catalyst 9120 APs. Poor WAN uplinks cause impacted branch AP and wireless client connectivity back to HO. and each campus location is now planned to have its own EWC controller based on C9120 AP to keep traffic local. This new design must accommodate these requirements:

• Guest WLAN will be routed locally.

• Employee WLAN must be authenticated 802.1x PEAP via HO data center ISE but can pass traffic locally once authenticated.

• HO WLC will be the primary backup WLC for each WLC.

Which design approach should the consulting engineer lake?

Options:

Two C9120 campus APs must be converted to EWC mode, one for the active controller and the other for standby with HQ WLC set as N»1 backup. The campus guest WLAN will use the guest anchor to HO WLC for guest VLAN access, and employee WLAN will need the HQ AAA server to be added to EWC and then use that to perform the 802.1x authentication.

Two C9120 campus APs must be converted to EWC mode, one for the active controller and the other for standby set as N+1 backup. The campus guest WLAN will use local web auth on guest VLAN. and employee WLAN will need the HO AAA server added to EWC.

One C9120 campus AP must be converted to EWC mode, and the preferred controller is set to that AP with HO WLC should be paired as mobility peer and configured as N+1 backup. The campus guest WLAN will use local web auth on guest VLAN. The campus employee WLAN will need the guest anchor back to the HO employee WLAN.

One C9120 AP in each campus must be converted to EWC mode, and the preferred controller is set to that AP with HO WLC set as N*1 backup. The campus guest WLAN will use local web auth on guest VLAN, and employee WLAN will need the HO AAA server to be added to EWC.

Answer

Questions # 87:

An engineer is designing a new wireless network. The network needs to meet these requirements:

Question # 87

Which design approach should be taken?

Options:

5 GHz frequency band with channel bonding, to support 40 MHz channels

5 GHz frequency band without channel bonding, to support 20 MHz channels

5 GHz frequency band with channel bonding, to support 80 MHz channels.

2.4 GHz frequency band without channel bonding, to support 20 MHz channels

Answer

Explanation

The design approach should use the 5 GHz frequency band without channel bonding to support 20 MHz channels. This provides a balance between network capacity and interference mitigation.

https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/108184-config-802-11n-wlc.html

Questions # 88:

An enterprise network administrator is asked to set up an experimental WLAN for a collaboration project with a local service provider. The WLAN must be anchored to a WLC in the service provider data center using legacy mobility mode. After the configurations are completed on the WLCs and the firewalls in the path, the data path mobility tunnel is failing to come up. What should be performed by the administrator to debug the issue?

Options:

Establish a Telnet connection from a local PC to the firewall on port 97.

Use the mapping command on the WLC.

Establish a Telnet connection from a local PC to the firewall on port 16666.

Use the mapping command on the WLC.

Answer

Explanation

When a data path mobility tunnel fails to come up, one of the troubleshooting steps is to check if the necessary ports are open and not being blocked by any firewalls in the path. Since the mobility tunnel uses CAPWAP, which operates on UDP ports 16666 (control path) and 16667 (data path), establishing a Telnet connection to the firewall on port 16666 can help determine if the control path is open and if there are any issues that need to be addressed3.

[Reference:, https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/107458-wga-faq.html, Community vote distribution, , ]

Questions # 89:

What is the recommended overlap percentage between adjacent AP cells in a data WLAN

design?

Options:

10%–15%

20%–30%

50%

Answer

Questions # 90:

During a post-deployment site Survey, issues are found with non wi-Fi interference. What should the engineer use to identify the source of the Interference?

Options:

Network analysis module

Wireless intrusion prevention

Wireshark

Cisco spectrum expert

Answer

Explanation

Cisco Spectrum Expert is a tool designed to identify and analyze non-Wi-Fi interference sources. During a post-deployment site survey, it can be used to detect interference from various devices such as cordless phones, Bluetooth devices, microwave ovens, and more. This tool provides a visual representation of the RF environment, allowing engineers to pinpoint the exact source of interference and take appropriate measures to mitigate its impact on the wireless network.

References := Designing Cisco Enterprise Wireless Networks (ENWLSD)

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