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Topic: Wireless ArchitectureSwitch
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1.0 Architecture

Wireless Architecture Practice Questions

FlexConnect, AP modes, centralized/split-MAC design, and fast roaming.

One solved question, so you can see how these are marked

In a Cisco FlexConnect wireless deployment, what happens to client data traffic when an Access Point in Standalone mode loses connection to the WLC?

Locally switched WLANs keep working, while centrally switched WLANs are dropped.

In FlexConnect Standalone mode (when connection to WLC is lost), SSIDs configured for Local Switching continue operating and switching traffic locally at the switch port. SSIDs configured for Central Switching lose connectivity.

Every question in the set below is marked like this. The answers stay hidden until you pick one.

All 6 Wireless Architecture questions in this set

Answers and explanations appear when you work through the set above.

  1. Which Cisco AP mode acts as a dedicated monitoring device that does not serve wireless clients, focusing exclusively on Location Services, Rogue AP Detection, and WIPS?

    • Local Mode
    • FlexConnect Mode
    • Monitor Mode
    • Sniffer Mode

  2. Which IEEE standard defines Fast BSS Transition (FT) to allow wireless clients to re-authenticate rapidly between Access Points on the same WLAN without incurring voice call delays?

    • IEEE 802.11k
    • IEEE 802.11r
    • IEEE 802.11v
    • IEEE 802.11w (PMF)

  3. What default UDP port numbers are used by CAPWAP for Control and Data traffic tunnels, respectively?

    • Control: UDP 5246; Data: UDP 5247
    • Control: UDP 161; Data: UDP 162
    • Control: UDP 12222; Data: UDP 12223
    • Control: UDP 1812; Data: UDP 1813

  4. In a Centralized (Split-MAC) Wireless Controller architecture, which function is performed directly on the Lightweight Access Point (LAP)?

    • 802.11 authentication and association processing for each client
    • Real-time 802.11 functions (beacons, probe responses, encryption)
    • 802.1X key management and the EAP exchange with the RADIUS server
    • Inter-VLAN routing between the wireless client subnets at the site

  5. In a Cisco wireless network using FlexConnect APs, what happens to locally switched WLAN client traffic if the WAN link connecting the FlexConnect AP to the central WLC fails?

    • All wireless clients are disconnected at once and the AP disables its radios.
    • The AP keeps switching client traffic locally onto its VLAN without interruption.
    • Client traffic is re-routed automatically through an SSH proxy tunnel to the WLC.
    • The AP reboots into autonomous mode and loads its last saved standalone configuration.

  6. In local mode (central switching), how does a lightweight AP forward a wireless client's data frame to the WLC?

    • It strips the 802.11 header, builds an 802.3 frame, and sends that inside CAPWAP data.
    • It encapsulates the original 802.11 frame in CAPWAP data (UDP 5247); the WLC converts it to 802.3.
    • It bridges the frame onto its local switch VLAN and sends only a copy to the WLC for logging.
    • It re-encrypts the frame with DTLS on the control channel (UDP 5246) along with the AP's own management traffic.