Cisco CCNA WLAN Architectures and Concepts 4 — Questions and Answers
Question 1: Which 802.11 frame type includes subtypes such as Beacon, Probe Request, Association Request, and Authentication?
- Data frames
- Control frames
- Management frames (Correct answer)
- Extension frames
Correct answer: Management frames
Management frames handle the setup and maintenance of wireless connections, including network discovery, authentication, and association.
Question 2: A client roams from AP1 to AP2, both managed by the same WLC. Which type of roaming occurs?
- Inter-controller roaming requiring full re-authentication
- Intra-controller roaming where the WLC updates client mapping internally (Correct answer)
- Layer 3 roaming requiring a new IP address assignment
- Mesh roaming using wireless backhaul negotiation
Correct answer: Intra-controller roaming where the WLC updates client mapping internally
When both APs are on the same WLC, intra-controller roaming occurs and the WLC simply updates its internal client-to-AP mapping without requiring full re-authentication.
Question 3: What does the term 'cell overlap' mean in wireless LAN design, and why is it recommended?
- APs sharing the same channel to double coverage capacity
- A 15-20% overlap between AP coverage areas to ensure seamless client roaming (Correct answer)
- Two APs transmitting simultaneously to eliminate dead zones
- APs configured with identical SSIDs on different bands
Correct answer: A 15-20% overlap between AP coverage areas to ensure seamless client roaming
A 15-20% coverage cell overlap between adjacent APs ensures clients can begin associating with the next AP before losing signal from the current one, enabling seamless roaming.
Question 4: Which statement about 802.11ac (Wi-Fi 5) is accurate?
- It operates in both 2.4 GHz and 5 GHz bands simultaneously
- It operates exclusively in the 5 GHz band and supports channel widths up to 160 MHz (Correct answer)
- It was the first standard to support MIMO technology
- It uses OFDM modulation but does not support MU-MIMO
Correct answer: It operates exclusively in the 5 GHz band and supports channel widths up to 160 MHz
802.11ac operates only in the 5 GHz band and supports channel bonding up to 160 MHz, along with MU-MIMO for improved multi-client performance.
Question 5: In Cisco WLC terminology, what is a 'dynamic interface' used for?
- Connecting the WLC to its management network
- Mapping a WLAN/SSID to a specific VLAN on the wired network (Correct answer)
- Providing a virtual IP for client web authentication redirects
- Establishing the CAPWAP tunnel endpoint for APs
Correct answer: Mapping a WLAN/SSID to a specific VLAN on the wired network
Dynamic interfaces on a WLC map specific WLANs (SSIDs) to VLANs on the wired network, allowing traffic segmentation for different wireless networks.
Question 6: What is the maximum number of non-overlapping channels available in the 2.4 GHz band in the United States?
- 1
- 3 (Correct answer)
- 11
- 14
Correct answer: 3
In the US, only channels 1, 6, and 11 are non-overlapping in the 2.4 GHz band, giving a maximum of 3 non-overlapping channels.
Question 7: Which WLAN deployment mode should be used when an AP needs to detect rogue devices and monitor RF activity without serving any clients?
- Local mode
- FlexConnect mode
- Monitor mode (Correct answer)
- Sniffer mode
Correct answer: Monitor mode
In monitor mode, the AP dedicates all its resources to scanning channels for rogues, interference, and security threats without providing client access.
Cisco CCNA WLAN Architectures and Concepts 4
Which 802.11 frame type includes subtypes such as Beacon, Probe Request, Association Request, and Authentication?