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66. Frage
What is the primary modulation technology used by 802.11ax in wireless communications?
Antwort: A
Begründung:
The correct answer is orthogonal frequency-division multiple access, or OFDMA. Cisco identifies
802.11ax, also known as Wi-Fi 6, as the generation that introduces OFDMA-based operation to improve efficiency, especially in dense wireless environments. Cisco's Catalyst 9800 documentation states that OFDMA support for 802.11ax APs improves performance in dense deployments, enables simultaneous data transmissions with OFDMA and MU-MIMO, and supports uplink and downlink multi-user operations across multiple client devices.
Strictly, OFDMA is a multi-user channel-access and subcarrier allocation method rather than a pure constellation modulation scheme. However, within 802.11ax fundamentals and this answer set, OFDMA is the defining PHY/MAC technology. It divides a 20, 40, 80, or 160 MHz channel into smaller resource units so multiple clients can transmit or receive in the same transmission opportunity. Cisco further explains that OFDMA improves wireless performance by using independently modulated subcarriers within frequencies, allowing simultaneous transmissions to and from multiple clients. FHSS and DSSS belong to older 802.11 PHY generations. QAM is used for symbol modulation, but "Quadrature Amplitude Modulation OFDMA" is not the primary
802.11ax technology name.
67. Frage
An engineer troubleshooting AP join failures notices DTLS negotiation errors between APs and the controller. Which issue is MOST likely responsible?
Antwort: C
Begründung:
DTLS relies on valid certificates and accurate time synchronization. Significant clock mismatches or certificate validation problems frequently prevent secure CAPWAP tunnels from forming between APs and controllers. RF profiles and multicast conditions generally do not affect DTLS establishment directly.
68. Frage
Which feature enables fast secure roaming in a wireless network?
Antwort: A
Begründung:
Fast secure roaming in enterprise wireless networks is achieved using the 802.11r standard, also known as Fast BSS Transition (FT). 802.11r allows clients to authenticate with a new access point (AP) before disassociating from the current AP, significantly reducing the time required for the re-authentication process.
This pre-authentication mechanism ensures that client sessions, such as voice or video calls, are maintained seamlessly when moving between APs in a mobility domain. DCA (Dynamic Channel Assignment) optimizes channel selection but does not affect roaming speed. 802.11ax enhances overall throughput and spectral efficiency but does not directly provide fast roaming. MIMO (Multiple Input Multiple Output) improves signal reliability and capacity but is unrelated to the authentication handoff process. Cisco Wireless Core Technologies highlight the deployment of 802.11r in conjunction with PMK caching and Opportunistic Key Caching (OKC) to further accelerate roaming in high-density environments. Implementing 802.11r is critical for environments requiring minimal packet loss and low latency during client movement, such as voice over Wi-Fi or real-time video applications. Reference topics:Client Connectivity Configuration - 802.11r, Fast BSS Transition, secure fast roaming, mobility domains, PMK caching.
69. Frage
A deployment requires that several APs be connected to edge switches, and each AP must support management and guest Wi-Fi traffic. The APs tag guest traffic separately from management, and the organization expects to add more VLANs for IoT and voice soon, so the configuration must support scalability. The security team requires that guest traffic never mix with internal resources. Which port configuration must be used for the switch interfaces that connect to the APs?
Antwort: D
Begründung:
The switch interfaces connected to the APs must be configured as 802.1Q trunk ports. The requirement states that AP management and guest Wi-Fi traffic must remain separate, and additional VLANs for IoT and voice are expected. An access port supports only one VLAN, so it cannot scale for multiple locally tagged client VLANs. Cisco's Catalyst AP guidance states that when multiple VLANs are used for client traffic, the AP switch port should trunk the VLANs, and management traffic is untagged; when a management VLAN is used, it should be configured as the native VLAN on the switch port. Cisco's Catalyst 9800 FlexConnect documentation also shows the AP connected to a trunk port with a native VLAN for AP IP connectivity and a separate VLAN for locally switched client traffic.
Option C is therefore correct: configure a trunk, set the AP management VLAN as native, and restrict the allowed VLAN list to only required management and client VLANs such as guest, IoT, and voice. This supports segmentation and prevents unnecessary internal VLAN exposure.
70. Frage
Which benefit does enabling SNMP monitoring provide for Cisco wireless device management?
Antwort: D
Begründung:
SNMP monitoring provides centralized visibility and event notification for Cisco wireless infrastructure. On Cisco Catalyst 9800 wireless controllers, SNMP traps are used to send alert messages from SNMP-enabled devices to an SNMP manager, and Cisco specifically documents wireless trap support for access points, clients, mesh, RF, rogue, mobility, RRM, and controller events. Cisco also states that AP-related traps such as crash, register, and no-radio-card events are enabled by default, and that configuring AP traps helps monitor AP status and troubleshoot issues.
Therefore, the direct operational benefit isalerts on access point status. SNMP is not limited to hardware-only metrics; it can expose client counts, joined AP counts, processor usage, memory usage, and wireless event notifications through supported OIDs and traps. Manual log review is the opposite of SNMP's purpose because traps automate notification to a network management system. Fragmented statistics are also incorrect because SNMP enables centralized polling and trap collection across managed devices. Reference topics:
Wireless Monitoring and Management - SNMP, MIB/OID monitoring, Catalyst 9800 wireless traps, AP status monitoring, and NMS integration.
71. Frage
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