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82. Frage
What is the primary modulation technology used by 802.11ax in wireless communications?
Antwort: D
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.
83. Frage
Exhibit:
Refer to the exhibit. An enterprise is deploying Cisco Catalyst 9800 WLCs and is using Catalyst Center as the management platform to oversee wireless access policies. To meet the organization's compliance requirements, all wireless endpoints must be evaluated with security posture validation before gaining access.
Which set of CLI commands must be added to the box in the code to complete the configuration?
Antwort: A
Begründung:
The correct configuration isaaa-overridefollowed bynacunder the existing Catalyst 9800 wireless policy profile. The exhibit already places the administrator in policy-profile configuration mode with wireless profile policy my-policy, so the missing commands must be policy-profile subcommands, not another profile declaration. Cisco's Catalyst 9800 configuration examples show the exact sequence: enter wireless profile policy < policy-profile-name > , enable aaa-override, enable nac, then configure VLAN and no shutdown.
aaa-override permits authorization attributes returned by AAA or Cisco ISE, such as VLAN, ACL, QoS, redirect ACL, or posture-related access controls, to override the locally defined policy. Cisco's documentation explicitly states that AAA override applies policies coming from AAA or ISE servers, while nac enables Network Access Control in the policy profile. This is the required behavior when endpoints must be posture- validated before normal network access is granted. Cisco also notes that NAC State is enabled in the policy profile and can only be enabled when AAA override is enabled.
Option A is invalid because nac-policy is not the correct CLI keyword. Options B and D omit NAC.
Reference topic:Client Connectivity Configuration - Catalyst 9800 policy profiles, AAA override, NAC State, posture enforcement, and ISE-based access control.
84. Frage
A network engineer is deploying a new wireless monitoring solution in a large campus. The engineer must connect Cisco Spaces Connector, Cisco ISE, and a Catalyst Center appliance to the switch infrastructure. All three services require management and telemetry connectivity, and the security policy mandates segregation of management and user traffic. The engineer also must ensure that any network changes do not disrupt ongoing wireless services for users and staff. Which implementation must the engineer use on the switch interfaces?
Antwort: A
Begründung:
For campus wireless monitoring deployments involving Cisco Spaces, ISE, and Catalyst Center appliances, strict separation of management traffic from user data is required to maintain security and service continuity. The correct approach is to configure the switch interfaces connecting these appliances as access ports assigned to the dedicated management VLAN. This ensures that management and telemetry traffic is isolated from production WLAN traffic, preventing any disruption to end users if configuration changes are made.
85. Frage
A persistent network issue is impacting connectivity for workstations in a training lab when connecting to a lab SSID. Wireless logs show clients never receive a DHCP offer when trying to obtain an IP address. The APs are operating in Local mode. Network monitoring systems indicate optimal signal quality and radio performance, VLAN assignments for the affected SSID have been configured, and all clients are affected. Which action resolves the issue?
Antwort: C
Begründung:
The fault domain is DHCP forwarding, not RF, client-side addressing, or AP discovery. Cisco explains that when a wireless client associates, it sends a DHCP Discover broadcast, and depending on AP mode, that traffic is either forwarded through the WLC or passed to the next hop. Cisco further states that if no DHCP server exists in the client's local Layer 2 domain, the router or SVI for the client VLAN must forward DHCP discovery traffic using an IP helper address.
Because the APs are in Local mode, client traffic is centrally switched through CAPWAP to the WLC, where the client VLAN/SVI path must correctly relay DHCP toward the DHCP server.
Cisco's Catalyst 9800 DHCP configuration guide shows DHCP relay configuration under the client VLAN SVI by entering the IPv4 helper address, and the CLI example uses ip helper- address <ip-address> to forward UDP broadcasts such as DHCP requests.
Option C resolves the issue because all clients are affected and none receive a DHCP offer, indicating the DHCP Discover is not reaching the DHCP server or the offer is not returning through the relay path. DHCP option 43 is for AP controller discovery, not client DHCP addressing.
86. 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.
87. Frage
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