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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Wireless Infrastructure Design | 30% | - Wired-wireless integration design
|
| Topic 2: Wireless Site Survey | 25% | - RF propagation and attenuation analysis - Design requirements collection and constraint evaluation
- Layer 1 site survey execution and analysis |
| Topic 3: WLAN High Availability and Security Design | 20% | - Management and monitoring design - High availability design
|
| Topic 4: Mobility Design | 25% | - Mobility architecture models
- Roaming optimization
|
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질문 # 122
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?
정답：B
설명：
When a data path mobility tunnel fails to come up between WLCs, one of the key troubleshooting steps is to verify whether the necessary ports are open through firewalls in the path. Cisco AireOS mobility tunnels use UDP port 16666 for mobility control traffic and IP Protocol 97 (EtherIP) for mobility data traffic in legacy mode. Establishing a Telnet connection from a local PC to the firewall on port 16666 tests whether the control path port is reachable and not being blocked by the firewall. If the Telnet connection fails, it confirms that the firewall is blocking port
16666, which would prevent the mobility control tunnel from establishing -- a prerequisite for the data tunnel. While a Telnet test to port 16666 specifically tests the control path, in practice this is the first verification performed when the data path cannot establish (since the data path depends on the control path being operational). IP Protocol 97 cannot be tested via Telnet (which is TCP).
질문 # 123
In a FlexConnect deployment, which role does the site tag play?
정답：A
설명：
In the Cisco Catalyst 9800 IOS XE WLC configuration framework, the site tag serves as the primary organizational and functional grouping element for FlexConnect APs at a given physical location. The site tag defines the FlexConnect site -- a logical boundary within which APs can perform local switching and local inter-AP roaming without requiring CAPWAP tunnel traversal to the WLC for every client handoff. Within a FlexConnect site defined by the site tag, APs can exchange client roaming context information directly with each other (peer-to-peer), enabling fast Layer 2 roaming for clients moving between APs that share the same site tag -- effectively defining the roaming domain for FlexConnect APs at that site. The site tag also references the flex profile (which defines VLAN mappings, local auth settings, and split tunneling parameters) and the AP join profile.
질문 # 124
An engineer must perform a predictive design for a wireless network. The customer has devices that can tolerate at most 100 ms of delay when roaming. Which design criteria must be used?
정답：A
설명：
Devices that can tolerate at most 100 ms of delay when roaming are voice devices. The 100 ms maximum roaming delay threshold is the Cisco-specified design criterion for VoWLAN implementations - it defines the maximum time a handset can tolerate being disconnected from the wireless network during a roam event before the voice call is degraded or dropped. This threshold drives specific design requirements: 15-20% cell overlap at -67 dBm, fast roaming mechanisms (802.11r, CCKM, or OKC), and AP placement along user movement paths. Location services (Option A) have flexible latency requirements. Data applications (Option B) can tolerate much higher latency - typically several hundred milliseconds. Video (Option C) streaming has buffering mechanisms that allow for higher latency tolerance than real-time voice. Only voice applications have the strict 100 ms roaming delay requirement that directly influences the predictive design criteria. Reference: WLSD Study Guide - VoWLAN Roaming Design, Roaming Delay Requirements, Predictive Survey Criteria.
질문 # 125
An engineer is designing a high-density WLAN that must support 100 concurrent users with 100 Mbps throughput consistently. The design allows for 20 Mbps per cell and per channel on the 5 GHz band. How many channels must the design use to provide 1 Mbps per user prior to RF overhead?
정답：B
설명：
This question requires straightforward wireless capacity engineering calculation. The total throughput requirement is 100 users ?1 Mbps per user = 100 Mbps aggregate. Each channel in the design can support 20 Mbps of usable throughput -- this is the per-cell, per-channel allocation defined in the design parameters, representing usable throughput prior to RF overhead as stated in the question. The number of channels required is: total required throughput divided by throughput per channel = 100 Mbps ?20 Mbps per channel = 5 channels. In practice, each channel corresponds to a non-overlapping frequency assignment in the 5 GHz band. With 5 channels and 20 Mbps per channel, the design provides exactly 100 Mbps of aggregate capacity for 100 concurrent users at 1 Mbps each. This calculation methodology is foundational to Cisco's high-density WLAN design approach, where the number of spatial streams, channel allocations, and AP placement are all derived from the per-user throughput requirement multiplied by the concurrent user population.
질문 # 126
A customer purchases this Cisco equipment for a new branch office: ?20 Cisco Catalyst 9120 APs ?five Catalyst 9130 APs ?a single Catalyst 9300 Series Switch The customer wants to extend its existing wired and wireless fabric-enabled network to the branch office and manage all devices via a centrally deployed Cisco Catalyst Center (formerly DNA Center). Which Cisco Catalyst Center licenses are required for the branch office equipment?
정답：D
설명：
Cisco Catalyst Center uses a tiered licensing model -- Essentials and Advantage -- applied to both switching and wireless infrastructure. To enable a fully fabric-enabled (SD-Access) deployment with centralized management, the Cisco Catalyst Advantage license is required across all device types. The Advantage tier unlocks Software-Defined Access fabric capabilities including macro and micro- segmentation, integration with Cisco ISE for policy enforcement, AI/ML-driven analytics, and automated provisioning. The Essentials license provides only basic device management and software image management -- it does not unlock SD-Access fabric functionality. Since the branch design specifically extends an existing fabric-enabled network, the Essentials tier for either the switch or APs would create a licensing gap preventing full fabric participation.
질문 # 127
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