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300-425
Designing Cisco Enterprise Wireless Networks (ENWLSD) Questions and Answers

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Questions # 1:

A rapidly expanding company has tasked their network engineer with wirelessly connecting a new cubicle area with Cisco workgroup bridges until the wired network is complete. Each of 42 new users has a computer and VoIP phone. How many APs for workgroup bridging must be ordered to keep cost at a minimum while connecting all devices?

Options:

Answer

Explanation

Cisco workgroup bridges typically support up to 8 wired clients. With 42 users, each having a computer and a VoIP phone, that’s a total of 84 devices. To connect all devices while keeping costs at a minimum, the company would need 6 APs (as 7 x 12 = 84), with each AP supporting 14 devices (7 computers and 7 VoIP phones).

So, each AP will have 25 clients. Minimum 4 APs are sufficient.

Questions # 2:

An engineer in a branch office that does not have a wired backhaul must ensure that local clients can be switched locally and authenticated centrally. In which mode must the AP be configured?

Options:

RAP

Flex+Bridge

MAP

Cisco FlexConnect

Answer

Explanation

Cisco FlexConnect mode is designed for branch offices that lack a wired backhaul. It allows APs to switch client data traffic locally while still performing client authentication centrally. This mode provides the flexibility needed for branch deployments, ensuring that client traffic is handled efficiently even if the WAN link to the central site is down. References: Cisco FlexConnect technical documentation and Designing Cisco Enterprise Wireless Networks (ENWLSD) training.

Questions # 3:

Which of the following is a design best practice for AP placement in a high-density environment like a lecture hall?

Options:

Increase transmit power on APs

Use omni-directional antennas only

Reduce cell size by lowering transmit power

Place APs directly next to each other

Answer

Questions # 4:

Which antenna type is most appropriate for covering a long hallway?

Options:

Omnidirectional

Patch

Yagi

Dipole

Answer

Questions # 5:

An engineer must ensure that the wireless network can accomplish fast secure roaming by way of caching keys on the access points. Which key caching mechanism is enabled by default on a Cisco AireOS WLC?

Options:

SKC

OKC

802.11r

CCKM

Answer

Questions # 6:

A customer has a Cisco wireless network that supports VoWLAN services. The customer wants supported voice clients to receive roaming recommendations and suggestions from APs. This functionality must not impact non-VoWLAN clients. What should be enabled on the

VoWLAN SSID?

Options:

802.11r Fast Transition

802.11k neighbor lists

CCKM with 802.1X

802.11v BSS Transition Management

Answer

Explanation

To support VoWLAN services and provide roaming recommendations to supported voice clients without impacting non-VoWLAN clients, the feature that should be enabled on the VoWLAN SSID is 802.11k neighbor lists. This feature allows APs to provide information about neighboring APs that are candidates for roaming, which helps clients make better decisions about when and where to roam. References := CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide Premium Edition and Practice

Questions # 7:

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 # 8:

During a wireless design, why should DFS (Dynamic Frequency Selection) channels be used cautiously?

Options:

They provide less throughput.

They can cause interference with Bluetooth devices.

They may be subject to radar interference and APs must vacate the channel.

They are not supported on 802.11ac.

Answer

Questions # 9:

Question # 9

Refer to the exhibit. During a post Mesh deployment survey, an engineer notices that frame collisions occur when MAP-1 and MAP-3 talk to RAP-2 Which type of issue does the engineer need to address in the design?

Options:

co-channel interference

backhaul latency

hidden node

exposed node

Answer

Explanation

The issue described is indicative of a hidden node problem, where MAP-1 and MAP-3 cannot hear each other’s transmissions but can both communicate with RAP-2. This leads to frame collisions as both MAPs may attempt to transmit at the same time, unaware of the other’s actions. The design needs to address this by implementing mechanisms such as RTS/CTS or adjusting the placement of the APs to avoid this issue.

https://www.cisco.com/en/US/docs/solutions/Enterprise/Mobility/emob30dg/WiMesh.pdf

Questions # 10:

A customer uses a Cisco Catalyst 9800 Series wireless controller to manage all of the APs for a campus network. Secure guest access is required for the guest network. A Cisco 5520 anchor controller is deployed within a DMZ. Which design approach ensures that the mobility tunnel is established successfully between the wireless controller and the anchor controller?

Options:

Run an Inter-Release Controller Mobility compatible software version on the wireless controller.

Enable control plane encryption on the wireless controller.

Disable data link encryption on the anchor controller.

Run an Inter-Release Controller Mobility compatible software version on the anchor controller.

Answer

Explanation

Enabling control plane encryption on the wireless controller is crucial for establishing a secure mobility tunnel between the wireless controller and the anchor controller. Control plane encryption ensures that the signaling and management traffic traversing the mobility tunnel is encrypted, providing a secure channel for guest access authentication and authorization processes. This is particularly important when the anchor controller is deployed within a DMZ, as it is exposed to potential external threats. The Cisco Catalyst 9800 Series wireless controller supports control plane security features that can be leveraged to secure the mobility tunnel and ensure the integrity and confidentiality of the control traffic.

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