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Zorluk: OrtaWireless Principles and Architecture

A network engineer deploys lightweight access points (LAPs) at a remote branch office connected over a WAN to a centralized Wireless LAN Controller (WLC). During a WAN outage, clients connected to APs in Local mode lose network connectivity, while clients connected to APs configured in FlexConnect mode with local switching retain local network access. Which operational characteristic of Local mode APs accounts for this behavior?

  1. Local mode APs encapsulate all client data traffic within CAPWAP data tunnels to be switched centrally by the WLC.Cevap
  2. B
    Local mode APs automatically convert into autonomous APs during WLC outages but drop client frames until manually rebooted.
  3. C
    Local mode APs function as Layer 3 routers that drop all incoming broadcast domains when controller heartbeats fail.
  4. D
    Local mode APs enforce traffic policing that buffers client packets until the CAPWAP control tunnel is restored.

Cevap

Local mode APs encapsulate all client data traffic within CAPWAP data tunnels to be switched centrally by the WLC.
In Cisco Centralized WLAN architectures, APs operating in Local mode encapsulate all client user traffic within CAPWAP data tunnels and forward it to the Wireless LAN Controller (WLC) for centralized processing and 802.3 Ethernet conversion. Consequently, if WAN connectivity to the central WLC is lost, Local mode APs cannot process or forward client traffic. In contrast, FlexConnect mode with local switching allows the AP to perform frame translation and switch client traffic directly onto the local branch switch, keeping local resources accessible during a WLC outage.

Adım Adım Çözüm

1
Analyze the operational behavior of Local mode in a Cisco Centralized WLAN architecture.
Local mode lightweight APs send both CAPWAP control and CAPWAP data packets back to the central WLC.
Centralized switching requires all 802.11 frames to be encapsulated in CAPWAP and sent to the WLC, where 802.11 to 802.3 frame conversion occurs.
2
Evaluate the impact of WAN failure and loss of WLC reachability on Local mode APs.
Since data switching depends on reaching the WLC, losing WLC connectivity prevents Local mode APs from forwarding client traffic.
Local mode APs cannot locally bridge client traffic to the branch switch infrastructure.
3
Compare with FlexConnect mode configured for local switching.
FlexConnect APs perform 802.11 to 802.3 frame translation locally at the branch level, allowing traffic to continue flowing locally even when WLC connectivity is lost.
FlexConnect separates local data path switching from centralized controller management.

Anahtar Kavram

Cisco Lightweight Access Point Modes (Local vs. FlexConnect) and CAPWAP Data Tunneling
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Konular

Wireless Principles and Architecture

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