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질문 # 117
A business is deploying Cisco Catalyst 9100 APs managed by Catalyst 9800 WLCs. The IT team needs policies that adapt based on user identity and device posture and also provide visibility into device activity and location. Which configuration meets these requirements?
정답：D
설명：
To enforce adaptive policies based on user identity, device posture, and provide comprehensive visibility into device activity and location, Cisco recommends integrating Cisco Catalyst Center, Cisco ISE, and Cisco Spaces. Cisco ISE provides identity-based access control and posture assessment, allowing dynamic policy enforcement for users and devices. Mobile device management integration further extends posture checks for endpoint compliance. Cisco Catalyst Center enables real-time assurance and monitoring of network performance, device activity, and service health, while Cisco Spaces provides location analytics and visibility of client devices across the wireless environment. Option B relies solely on ACLs and MDM, which cannot provide full network-wide visibility or context-aware policy enforcement. Option C enables visibility via Catalyst Center but lacks dynamic identity and posture-based policies because it omits ISE integration. Option D integrates ISE but neglects device posture and location visibility, failing to meet all requirements. The combination in Option A ensures that adaptive policies can respond to real-time user and device conditions, enforce compliance, and provide actionable insights for network operations. Reference topics:Wireless Monitoring and Management - Catalyst Center assurance, Cisco ISE integration, mobile device posture, Cisco Spaces location analytics.
질문 # 118
What is the main benefit of using AI Enhanced RRM on the Cisco Catalyst 9800 wireless controller?
정답：B
설명：
AI Enhanced RRM is not a static-threshold tuning feature and it is not designed to simply raise AP transmit power. Cisco defines AI Enhanced RRM as a radio resource management technology that applies artificial intelligence and machine learning to optimize RF environments, uses distributed data collection from Cisco wireless controllers with cloud-based analytics, and automates adaptive RF parameter tuning for Cisco wireless networks.
The operational model is telemetry-driven. RF telemetry is collected from APs by the Catalyst
9800 WLC, sent through Cisco Catalyst Center to the Cisco AI Analytics Cloud, analyzed by RRM algorithms, and then configuration-change information is returned through Catalyst Center toward the managed wireless infrastructure. Cisco's AI-Enhanced RRM deployment guide further identifies DCA, TPC, FRA, and DBS as examples of optimizations performed, meaning the feature enhances dynamic RF control rather than disabling it.
Therefore, option D is the only correct answer. Options A, B, and C describe either legacy/static behavior, harmful power-only logic, or a fixed RF design model that contradicts Cisco AI Enhanced RRM.
질문 # 119
Which feature enables fast secure roaming in a wireless network?
정답：B
설명：
Fast secure roaming in enterprise wireless networks is achieved using the 802.11r standard, also known as Fast BSS Transition (FT). 802.11r allows clients to authenticate with a new access point (AP) before disassociating from the current AP, significantly reducing the time required for the re- authentication process. This pre-authentication mechanism ensures that client sessions, such as voice or video calls, are maintained seamlessly when moving between APs in a mobility domain. DCA (Dynamic Channel Assignment) optimizes channel selection but does not affect roaming speed. 802.11ax enhances overall throughput and spectral efficiency but does not directly provide fast roaming. MIMO (Multiple Input Multiple Output) improves signal reliability and capacity but is unrelated to the authentication handoff process. Cisco Wireless Core Technologies highlight the deployment of 802.11r in conjunction with PMK caching and Opportunistic Key Caching (OKC) to further accelerate roaming in high-density environments.
Implementing 802.11r is critical for environments requiring minimal packet loss and low latency during client movement, such as voice over Wi-Fi or real-time video applications.
질문 # 120
How does MIMO operate during wireless transmission?
정답：A
설명：
MIMO, or Multiple-Input Multiple-Output, is a core 802.11n and later wireless technology that uses multiple transmit and receive radio chains and antennas to improve wireless performance.
Cisco's Wireless RF Reference Guide explains that IEEE 802.11n introduced MIMO, replacing the older single-radio SISO model with multiple radios, each using its own antenna, to increase data rates and improve reception in multipath environments. Cisco also notes that weak or distorted multipath signals can be received by more than one radio and reconstructed, improving decode quality and reliability.
This directly supports option A: MIMO exploits multiple RF paths rather than treating multipath as purely destructive. Depending on implementation, MIMO can use spatial diversity, maximal ratio combining, and spatial streams to increase throughput, improve signal-to-noise ratio, reduce retries, and make more efficient use of airtime. Cisco describes spatial stream notation such as
4x4:4 as four transmitters, four receivers, and four spatial streams. Option B describes frequency hopping, not MIMO. Option C is not a MIMO function. Option D is the opposite of MIMO because MIMO deliberately uses multiple antennas and radio paths.
질문 # 121
A university is deploying Cisco Catalyst 9176 APs at several satellite campuses, each with its own subnet and DNS services. The APs will be shipped with only their MAC addresses preregistered on the WLC. The satellite campuses do not use DHCP option 43, but they have access to a central DNS server. IT staff want APs to discover and join the Catalyst 9800 WLC automatically without site visits. Which solution must the IT staff implement?
정답：D
설명：
For Cisco Catalyst 9176 APs deployed at remote sites without DHCP option 43, automatic WLC discovery can be accomplished using DNS-based CAPWAP controller discovery. By creating a DNS A record namedcisco-capwap-controller. < domain > that resolves to the WLC management IP address, APs can query DNS and locate their centralized controller automatically, eliminating the need for site visits or manual configuration. This method is preferred for large-scale or satellite deployments where APs may exist on different subnets and traditional DHCP-based discovery is unavailable. Option A is impractical because manually assigning static IPs to hundreds of APs is operationally complex and error-prone. Option B, using a multicast group, is not supported for cross-subnet controller discovery in CAPWAP; multicast is limited to local subnets. Option D (ap-discovery) is not a recognized standard for WLC discovery; Cisco specifically documentscisco-capwap-controlleras the required DNS entry for CAPWAP-based automatic discovery. This approach ensures zero-touch provisioning, simplifies network operations, and guarantees that APs join the correct controller, supporting centralized management and consistent configuration across multiple campuses.
Reference topics:Wireless Network Implementation - CAPWAP discovery, DNS-based controller discovery, Catalyst 9800 WLC onboarding, zero-touch provisioning.
질문 # 122
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