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| Section | Weight | Objectives |
|---|---|---|
| Wireless Site Survey | 25% | - Predictive site survey - Collect design requirements and evaluate constraints - Planning tools and network metrics evaluation - Material attenuation and its design effects - Post-deployment site survey - Layer 1 site survey analysis - Pre-deployment site survey |
| Mobility | 25% | - Optimize client roaming - Design mobility groups - Validate mobility tunneling - Site Tags |
| Wired and Wireless Infrastructure | 30% | - Logical infrastructure requirements - Design high-density wireless networks - Design radio management - Design for data, voice, video, location - Physical infrastructure requirements - Design wireless bridging (mesh) |
| WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
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NEW QUESTION # 80
A company has three Cisco WLCs that are joined as a mobility group. Mobility multicast messaging is enabled. All the WLCs in the mobility group communicate via a multicast. Which configuration must be identical between the three WLCs to validate communication?
Answer: B
Explanation:
When Cisco WLCs are configured to use multicast for mobility group communications, all WLCs participating in the same mobility group must be configured with an identical multicast group IP address. The mobility multicast mode allows a WLC to send a single multicast frame received simultaneously by all other WLCs in the group, rather than sending individual unicast copies to each peer. For this to function correctly, every WLC in the group must join the same IP multicast group address, and the underlying network infrastructure must be configured to support IP multicast routing or IGMP snooping for that specific group address. If any WLC is configured with a different multicast IP address, it will join a different multicast group and will not receive mobility messages from the other WLCs, effectively isolating it from the group ' s communication plane. Service port IP addresses (Option A) are unique per controller. Interface IDs (Option B) are locally significant identifiers. Management IP addresses (Option C) are unique per WLC and identify each peer in unicast configurations. Reference: WLSD Study Guide - Mobility Group Configuration, Multicast Mobility Messaging, WLC Peer Communication.
NEW QUESTION # 81
A hospital has a Cisco Catalyst 9800 Series Wireless Controller in an SSO solution deployed in the primary data center. The hospital plans to increase redundancy in the wireless environment.
Management decides to deploy an extra Catalyst 9800 WLC offsite to another data center on a different subnet. A WAN link connects the data centers with a firewall at both ends. Which two design approaches must the engineer take to ensure that the APs can fail over? (Choose two.)
Answer: A,B
Explanation:
For APs to be able to fail over between a primary SSO pair in one data center and a standalone WLC in a remote data center connected via WAN with firewalls, two design requirements must be met. First, a mobility tunnel must be created between the wireless controllers (Option A). The mobility tunnel enables the controllers to exchange mobility control messages, peer information, and eventually AP context when failover occurs. Without the mobility tunnel, the remote WLC is not recognized as a valid failover target by the APs through the mobility domain. Second, UDP ports 16666 and 16667 must be open through the firewalls between the controllers (Option D).
UDP port 16666 is used for mobility control traffic and UDP port 16667 is used for mobility data traffic -- both must be permitted through the firewalls at both data centers for the mobility tunnel to establish and function.
NEW QUESTION # 82
A customer has a Cisco wireless network with two Cisco Catalyst 9800 Series WLCs in a high availability cluster, 50 Cisco 2800I APs, and all SSIDs and services are 5 GHz only. A security mandate requires that rogue APs be scanned and identified in 2.4 GHz and 5 GHz bands without impacting existing client connectivity. How must the wireless network be reconfigured to meet the requirement without purchasing additional APs?
Answer: C
Explanation:
The Cisco Aironet 2800 Series APs feature a dual-radio architecture with a dedicated 5 GHz radio (slot 1) and a Flexible Radio Assignment (XOR) radio (slot 0) that can operate in either 2.4 GHz or 5 GHz, or be assigned to monitor mode for scanning functions. Since all existing SSIDs and services are 5 GHz only, the slot 1 (dedicated 5 GHz) radio is responsible for all current client connectivity and must remain in Client Serving mode to maintain uninterrupted service. The XOR radio (slot 0) is currently either operating as a secondary 5 GHz radio or idle. By setting the XOR radio to Monitor mode, it becomes a dedicated scanner that continuously scans all channels across both 2.4 GHz and 5 GHz spectrum for rogue AP detection, using the embedded CleanAir and WIDS capabilities. This covers the previously unmonitored 2.4 GHz band and provides supplementary 5 GHz monitoring. No additional APs need to be purchased because the existing AP's XOR radio is repurposed.
NEW QUESTION # 83
A customer has an existing wireless network with a Cisco 9800 WLC high availability cluster and Cisco 9120 APs. The customer asks an engineer to perform a post wireless survey that includes a list of any non-802.11 devices on the 5 GHz band. The engineer performs the survey using an 802.11a/b/g/n/ac/ax WLAN adapter but did not use a spectrum analyzer. Which approach meets the requirements?
Answer: D
Explanation:
Non-802.11 device detection on the 5 GHz band without a dedicated spectrum analyzer is possible through Cisco ' s CleanAir technology, which is embedded as an RF ASIC in many Cisco AP models including the
9120 series. CleanAir operates at the hardware layer - below the 802.11 MAC - enabling the APs to detect, classify, and report non-802.11 interference sources such as cordless phones, microwave ovens, video cameras, radar, and other unlicensed RF emitters in the 5 GHz spectrum. The WLC aggregates CleanAir reports from all APs and provides a consolidated interference device list accessible through the WLC ' s monitoring interface. Since the question specifies the 5 GHz band, the relevant 802.11 protocol for 5 GHz is
802.11a (and its successors 802.11n and 802.11ac). Exporting the list of 802.11a interferers from the WLC using the CleanAir RF ASIC correctly targets the 5 GHz band and identifies non-802.11 devices detected there. Option A incorrectly references 802.11b, which operates only on 2.4 GHz. Options B and C attempt to use the WLAN adapter for non-802.11 detection, but a standard WLAN adapter in monitor mode can only capture 802.11 frames - it cannot detect non-802.11 RF energy without a spectrum analyzer chipset.
Reference: WLSD Study Guide - Cisco CleanAir Technology, Non-802.11 Interference Detection, Post- Deployment Survey Methodology.
NEW QUESTION # 84
An engineer is designing a wireless solution for a corporate campus which includes two primary buildings:
Research and Operations. The design must ensure seamless mobility for employees moving between buildings, support uninterrupted connectivity for real-time applications, and facilitate efficient Layer 2 and Layer 3 roaming. Each building ' s 9800-80 WLC manages its local APs, and the solution must support 802.11 r/k/v while maintaining an effective mobility control plane. Which design approach leverages Cisco mobility group architecture to meet the requirements?
Answer: C
Explanation:
Cisco ' s mobility group architecture enables seamless client roaming between WLCs by establishing a trusted peer relationship and shared mobility domain. When two Cisco Catalyst 9800-80 WLCs are placed in the same mobility group, they establish CAPWAP mobility tunnels enabling both Layer 2 and Layer 3 roaming with session continuity including IP address preservation. Within the same mobility group, WLCs exchange client state information, allowing 802.11r Fast BSS Transition, 802.11k neighbor reports, and 802.11v BSS Transition Management to function across controller boundaries. No specific primary or secondary roles are assigned within a mobility group - all members are peers with equal standing for roaming purposes, which is precisely what Option D describes. Option A incorrectly implies a hierarchical structure that does not exist in mobility group peer relationships. Option B separating the WLCs into different groups would break inter- building roaming since clients would experience a full re-authentication cycle. Option C imposing an anchor relationship is appropriate only for guest WLANs. Reference: WLSD Study Guide - Mobility Group Architecture, Inter-Controller Roaming, 802.11r/k/v Fast Roaming Design.
NEW QUESTION # 85
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