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Topic: Wireless Infrastructure ServicesSwitch
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3.0 Infrastructure

Wireless Infrastructure Services Practice Questions

CAPWAP tunnels, WLC roaming, AP modes, and 802.11/Wi-Fi 6 fundamentals.

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

Which standard UDP ports are used by CAPWAP for Control and Data traffic respectively?

UDP 5246 (Control), UDP 5247 (Data)

CAPWAP (RFC 5415) uses UDP port 5246 for control messages and UDP port 5247 for encapsulated data. UDP 12222/12223 were used by the older LWAPP protocol.

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

All 8 Wireless Infrastructure Services questions in this set

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

  1. Which 802.11 frame category includes Beacon, Probe Request, Probe Response, Authentication, and Association Request frames?

    • Control Frames
    • Data Frames
    • Management Frames
    • Action Frames

  2. What occurs during Layer 3 Inter-Controller roaming when a wireless client moves between two Access Points managed by different Wireless LAN Controllers on different subnets?

    • The client must re-authenticate with 802.1X and obtain a new IP address from the new subnet via DHCP.
    • A mobility tunnel between the anchor and foreign WLCs lets the client keep its original IP address.
    • The client drops all TCP sessions and rebuilds them after it is given a new address on the new WLC.
    • The client's AP switches to FlexConnect local switching mode automatically to bridge the two subnets.

  3. Which three non-overlapping channels are recommended for 2.4 GHz Wi-Fi deployments operating in North America and standard regulatory domains?

    • Channels 1, 2, 3
    • Channels 1, 6, 11
    • Channels 3, 7, 9
    • Channels 36, 40, 44

  4. Which Cisco Access Point operational mode dedicates its radios to scanning for rogue APs, wIPS attacks, and location tracking without serving wireless clients?

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

  5. Which UDP port numbers are used by Cisco Lightweight Access Points for CAPWAP Control and CAPWAP Data traffic, respectively?

    • Control = UDP 5246; Data = UDP 5247
    • Control = UDP 12222; Data = UDP 12223
    • Control = TCP 80; Data = TCP 443
    • Control = UDP 161; Data = UDP 162

  6. What main operational advantage does Target Wake Time (TWT) provide in Wi-Fi 6 (802.11ax) wireless deployments?

    • Wider 320 MHz RF channels that raise the peak data rate available to every connected client.
    • Encryption of management frames with WPA2-Enterprise to stop deauthentication attacks.
    • Scheduled wake and sleep times negotiated between AP and client, extending battery life.
    • Double the maximum transmit power on each AP radio, extending the coverage of every cell.

  7. In Wi-Fi specifications, what does a radio configuration designated as 4x4:4 MIMO represent?

    • 4 transmit chains, 4 receive chains, 4 spatial streams
    • 4 GHz frequency band, 4 channels, and 4 client devices supported
    • 4 watts of transmit power, 4 dBi antenna gain, and 4 SSIDs
    • 4-second beacon interval, 4 radios, and 4 Ethernet ports

  8. Which two primary automated algorithms are executed by Cisco Radio Resource Management (RRM) to optimize RF coverage across lightweight APs?

    • Dynamic Channel Assignment (DCA) and Transmit Power Control (TPC)
    • WPA3 SAE key renewal and EAP-TLS certificate enrollment for every client
    • CAPWAP keepalive management and automatic rogue AP containment
    • FlexConnect VLAN trunking and per-WLAN VLAN mapping