CCIE CCIE Enterprise Wireless 1 — Questions and Answers
Question 1: Which 802.11 amendment introduced OFDMA and multi-user MIMO for the 6 GHz band?
- 802.11ac
- 802.11ax (Wi-Fi 6/6E) (Correct answer)
- 802.11n
- 802.11ad
Correct answer: 802.11ax (Wi-Fi 6/6E)
IEEE 802.11ax (Wi-Fi 6/6E) introduced OFDMA and MU-MIMO for both uplink and downlink, with Wi-Fi 6E extending to the 6 GHz band.
Question 2: In Cisco wireless, what is the function of the CAPWAP protocol?
- Encrypting client data between AP and controller
- Providing tunnel between lightweight APs and WLC (Correct answer)
- Distributing IP addresses to wireless clients
- Authenticating users via 802.1X
Correct answer: Providing tunnel between lightweight APs and WLC
CAPWAP (Control And Provisioning of Wireless Access Points) provides the control and data tunnel between lightweight APs and the WLC.
Question 3: What is the maximum number of spatial streams supported by 802.11ax (Wi-Fi 6)?
- 4
- 6
- 8 (Correct answer)
- 16
Correct answer: 8
802.11ax supports up to 8 spatial streams for MU-MIMO, maintaining the same maximum as 802.11ac Wave 2.
Question 4: Which Cisco WLC feature automatically adjusts AP transmit power and channel assignment to optimize RF coverage?
- CleanAir
- RRM (Radio Resource Management) (Correct answer)
- FastLocate
- Hyperlocation
Correct answer: RRM (Radio Resource Management)
Radio Resource Management (RRM) dynamically adjusts AP transmit power and channel assignments based on RF environment analysis.
Question 5: In 802.11 security, what protocol replaced TKIP for stronger encryption in WPA2?
- WEP
- AES-CCMP (Correct answer)
- RC4
- 3DES
Correct answer: AES-CCMP
AES-CCMP replaced TKIP/RC4 in WPA2, providing much stronger encryption using the AES block cipher with CCMP mode.
Question 6: What is BSS Coloring in 802.11ax used for?
- Assigning colors to SSIDs for visual management
- Reducing co-channel interference via spatial reuse (Correct answer)
- Color-coding QoS priority levels
- Identifying rogue APs
Correct answer: Reducing co-channel interference via spatial reuse
BSS Coloring assigns unique color bits to overlapping BSSs, allowing stations to identify and ignore foreign-BSS transmissions, enabling spatial reuse.
CCIE CCIE Enterprise Wireless 1
Which 802.11 amendment introduced OFDMA and multi-user MIMO for the 6 GHz band?