WLAN Architecture: Fat vs Fit AP and AC Deployment
Short answer
B An AC is usually deployed at the aggregation layer of a network to provide high-speed, secure, and reliable WLAN services.
Question
Key Takeaways
The trap lies in confusing which AP type is dependent on an AC; Fit APs require central management, whereas Fat APs are standalone.
This H12-811 question examines WLAN device roles, confirming that Access Controllers are typically placed at the aggregation layer to manage Fit APs, while Fat APs operate autonomously.
Common mistake: Candidates often select Option C because they assume 'Fit' implies 'independent capability'. However, 'Fit' means the AP fits into a larger managed system, lacking full independent control plane features.
Expert Analysis
The question tests the fundamental distinction between Fat APs and Fit APs in a WLAN architecture, as well as the role of the AC (Access Controller).
- Option A is false: Fat APs are autonomous; they do not collaborate with ACs. Fit APs are the ones that rely on ACs for management and control plane functions.
- Option B is true: In a typical centralized WLAN architecture, the AC is deployed at the aggregation layer (or core layer depending on scale) to centrally manage multiple Fit APs. This allows for scalable, secure, and high-speed service delivery by handling authentication, roaming, and policy enforcement centrally.
- Option C is false: Fit APs operate in thin mode; they forward traffic but rely on the AC for configuration, management, and often decision-making regarding user access. It is the Fat AP that can independently provide these functions.
- Option D is false: Wireless devices, including both APs and clients, almost always include wired Ethernet interfaces (e.g., for uplink connectivity or PoE power/data).
Exam Strategy
When analyzing WLAN questions, immediately classify each AP mentioned as either 'Fat' (autonomous, all-in-one) or 'Fit' (thin, controller-dependent). Remember that ACs handle the 'brains' (control plane) for Fit APs, while Fat APs keep the 'brains' locally. This mental model helps quickly eliminate options mixing these roles.
Frequently Asked Questions
What is the difference between a Fat AP and a Fit AP?
Where is the AC typically deployed in a campus network?
Community Votes
100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 2 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 2
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Fmoura17 👍 1 Answered BB is correct. ACs are deployed at the aggregation layer to centrally manage Fit APs and provide high-speed, secure WLAN services. A — Fit APs collaborate with ACs, not Fat APs. C — It's Fat APs that work independently, not Fit APs. D — Wireless devices do have wired (Ethernet) interfaces.
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amiie00 👍 1 Answered BChoice A : "Typically"... I think FAT AP cap provide wireless access independently
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