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81. 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: B
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 inLocal 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 usesip 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. Reference topics:DHCP relay, Local mode AP forwarding, Catalyst 9800 client VLANs, and wireless client IP assignment.
82. Frage
A university is deploying Cisco Catalyst 9176 APs at several satellite campuses, each with its own subnet and DNS services. The APs will be shipped with only their MAC addresses preregistered on the WLC. The satellite campuses do not use DHCP option 43, but they have access to a central DNS server. IT staff want APs to discover and join the Catalyst 9800 WLC automatically without site visits. Which solution must the IT staff implement?
Antwort: B
Begründung:
For Cisco Catalyst 9176 APs deployed at remote sites without DHCP option 43, automatic WLC discovery can be accomplished using DNS-based CAPWAP controller discovery. By creating a DNS A record namedcisco-capwap-controller. < domain > that resolves to the WLC management IP address, APs can query DNS and locate their centralized controller automatically, eliminating the need for site visits or manual configuration. This method is preferred for large-scale or satellite deployments where APs may exist on different subnets and traditional DHCP-based discovery is unavailable. Option A is impractical because manually assigning static IPs to hundreds of APs is operationally complex and error-prone. Option B, using a multicast group, is not supported for cross-subnet controller discovery in CAPWAP; multicast is limited to local subnets. Option D (ap-discovery) is not a recognized standard for WLC discovery; Cisco specifically documentscisco-capwap-controlleras the required DNS entry for CAPWAP-based automatic discovery. This approach ensures zero-touch provisioning, simplifies network operations, and guarantees that APs join the correct controller, supporting centralized management and consistent configuration across multiple campuses.
Reference topics:Wireless Network Implementation - CAPWAP discovery, DNS-based controller discovery, Catalyst 9800 WLC onboarding, zero-touch provisioning.
83. Frage
Refer to the exhibit. An organization wants to use Cisco Spaces for location analytics, and an engineer is setting up the Cisco Catalyst 9800 WLC to send location data. The Spaces connector has already been configured and is operational on the WLC. The engineer must now configure the controller to forward telemetry data to the correct Spaces cloud endpoint using TLS to complete the integration. Which CLI command must be added to the box in the code?
Antwort: B
Begründung:
The correct command is receiver ip address 198.51.100.10 57555 protocol tls-native profile spaces-profile because it matches the Cisco IOS XE model-driven telemetry subscription syntax used on Catalyst 9800 controllers. Cisco documents the receiver statement under telemetry ietf subscription as receiver ip address ip-address receiver-port protocol protocol profile name, and describes it as the command that configures the receiver IP address, port, protocol, and profile for telemetry notifications.
In the exhibit, the subscription already defines the telemetry feed: encode-tdl encoding, a native stream, the TDL URI for ewlc/wlan_config, the WLC source address, and an on-change update policy. What is missing is the collector destination. For Cisco Spaces or Catalyst Center-style integrations, the WLC must know where to export telemetry and which secure transport profile to use. Cisco troubleshooting examples for Catalyst 9800 telemetry use the same command structure: receiver ip address X.X.X.X 25103 protocol tls-native profile ... under the telemetry subscription.
Options A, B, and D are invalid because they reorder the CLI keywords. IOS XE telemetry configuration is parser-order sensitive: the command begins with receiver ip address, followed by the receiver port, then protocol, then profile.
84. Frage
What does an elevated noise floor indicate in an RF environment?
Antwort: D
Begründung:
An elevated noise floor indicates degraded RF conditions and directly reduces wireless link reliability. Cisco defines the noise floor as the ambient RF noise level, expressed in dBm, below which received signals are unintelligible. Cisco also defines SNR as the ratio of signal strength to the noise floor, meaning that when the noise floor rises, the usable separation between the desired signal and background RF energy decreases.
For a receiver to decode frames reliably, the received signal must remain sufficiently above the noise floor.
Cisco site-survey guidance states that RF signals must be higher than the noise floor to be detectable as valid useful signals, and gives the common design example of -67 dBm signal with a -92 dBm noise floor to maintain 25 dB SNR. When the noise floor is elevated, SNR drops, clients experience more retries, lower modulation rates, reduced throughput, and possible disconnects. Cisco's high-density wireless guidance states that raised noise floor lowers SNR, translating to lower speeds and higher airtime utilization. Options B, C, and D describe unrelated timing, spectrum-planning, or bandwidth-demand concepts. Reference topics:RF Fundamentals - noise floor, SNR, RSSI, RF interference, retries, and wireless link quality.
85. Frage 
Refer to the exhibit. An engineer is preparing a Cisco 9800-L WLC for deployment in a sensitive area. Only encrypted remote management via SSH is allowed, and all other VTY access methods must be disabled. The
9800-L WLC will be part of a larger deployment, and an external audit will check for any unencrypted management protocols. According to the requirements, only SSH is allowed for remote CLI sessions. Which set of commands must be executed to complete the Cisco IOS XE CLI configuration on the WLC?
Antwort: C
Begründung:
The correct configuration is option C because Cisco IOS XE restricts inbound protocols on VTY lines with thetransport inputcommand. Cisco's Catalyst 9800 best-practice guidance states that administrators should confirm SSH is enabled and Telnet is disabled for better controller security, and that the Catalyst 9800 follows standard Cisco IOS XE behavior for enabling or disabling Telnet and SSH. Cisco IOS XE SSH documentation explicitly showsline vty line_number [ending_line_number]followed bytransport input ssh, and explains that this prevents non-SSH Telnet connections, limiting access to SSH only.
The existing exhibit already includes the SSH prerequisites: hostname, domain name, RSA key generation, AAA new-model, a default login method using local credentials, and a local privileged user. The missing VTY configuration must therefore apply that default AAA login list to the VTY lines withlogin authentication defaultand restrict inbound transport to SSH. Cisco AAA documentation confirms thatlogin authentication defaultapplies the configured default authentication list to the line or set of lines. Option A is incomplete and does not explicitly permit SSH. Option B uses invalid syntax. Option D omits the requiredinputkeyword.
Reference topics:Catalyst 9800 secure management, VTY access control, SSH, Telnet hardening, AAA login authentication, and IOS XE device administration.
86. Frage
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