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Zorluk: OrtaWireless Principles and Architecture

An enterprise network engineer is deploying a centralized wireless architecture using Cisco Lightweight Access Points (LAPs) and a Wireless LAN Controller (WLC) configured for Split-MAC operation. Which function is performed locally by the Lightweight Access Point during normal operation?

  1. Transmission of 802.11 beacon frames and handling of probe responsesCevap
  2. B
    Processing of 802.11 client association and reassociation requests
  3. C
    Execution of 802.1X EAP client authentication and security key management
  4. D
    Translation of 802.11 wireless frames into 802.3 Ethernet frames

Cevap

Transmission of 802.11 beacon frames and handling of probe responses
Under Cisco's Split-MAC architecture, real-time 802.11 PHY and MAC functions—such as generating 802.11 beacon frames, responding to client probe requests, packet buffering for power-save mode, and layer 1/2 frame acknowledgments—are handled directly by the Lightweight Access Point (LAP). Because these operations demand tight, real-time execution, processing them locally prevents latency issues that would occur if traffic had to travel back and forth over a CAPWAP tunnel to the WLC.

Adım Adım Çözüm

1
Analyze the Split-MAC architecture model used in Cisco centralized wireless networks.
Identify that functions are split between real-time MAC functions (AP) and management/non-real-time MAC functions (WLC).
Split-MAC optimizes processing by keeping delay-sensitive RF tasks on the AP while centralizing policy and control on the WLC.
2
Categorize the AP responsibilities under real-time MAC operations.
Real-time MAC tasks include sending 802.11 beacons, responding to probe requests, frame handshakes (ACKs), and packet buffering for power-save clients.
These tasks require microsecond-level timing and cannot tolerate latency introduced by traversing a CAPWAP tunnel to the controller.
3
Categorize WLC responsibilities under management and security functions.
Non-real-time functions include 802.11 authentication/association, 802.1X/EAP processing, security key distribution, and 802.11-to-802.3 frame conversion.
These functions control network access policies and data forwarding centrally.

Anahtar Kavram

Split-MAC Architecture Division of Responsibilities
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Wireless Principles and Architecture

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