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NEW QUESTION # 85
What does an elevated noise floor indicate in an RF environment?
Answer: D
Explanation:
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.
NEW QUESTION # 86
Which wireless connection occurs when there are no physical obstacles between the receiver and transmitter?
Answer: A
Explanation:
The correct answer isline-of-sight. In RF terminology, line-of-sight describes a wireless path where the transmitting antenna and receiving antenna have an unobstructed visual or RF path between them. Cisco's RF power documentation defines this directly: antennas that can see each other without obstacles between them are considered to be in line of sight. This is especially important in outdoor, bridge, mesh, and point-to-point wireless designs, where buildings, terrain, foliage, or other obstructions can degrade or block the RF path.
The other options describe different RF behaviors.Attenuationis signal loss as RF energy travels through free space, cables, walls, or other materials.Reflectionoccurs when RF energy bounces off a surface such as metal, glass, or concrete, often contributing to multipath.Beamformingis an antenna/transmission technique that focuses RF energy toward a client or receiver to improve signal quality; it is not the condition of having no obstacles. Cisco mesh planning guidance also emphasizes verifying whether a wireless link has clear line of sight before deployment, reinforcing that LOS is a path condition, not a modulation or security feature.
Reference topic:RF Fundamentals - RF propagation, path loss, line-of-sight, obstruction effects, and wireless link planning.
NEW QUESTION # 87
Which role does a fabric edge node perform in a Cisco wireless fabric architecture?
Answer: D
Explanation:
In a Cisco wireless fabric architecture, fabric edge nodes are responsible for terminating user data traffic at the network edge. These nodes act as the first point of contact for client devices, handling tasks such as encryption
/decryption, VLAN tagging, Quality of Service (QoS) enforcement, and traffic forwarding to the appropriate destination within the fabric. The design centralizes control-plane functions in fabric control nodes, while edge nodes focus on data-plane operations to reduce latency and optimize network performance. Option A, authenticating TLS connections for management, is handled by management or control-plane components rather than edge nodes. Option B, enabling multicast snooping, is a network switch function but not a core responsibility of fabric edge nodes. Option D, converting Layer 2 to Layer 3 addresses, is part of routing functions and not a dedicated role of the wireless fabric edge node in client data processing. Cisco Wireless Core Technologies emphasize that by terminating user data at the edge, fabric edge nodes enable efficient traffic handling, secure processing, and scalable wireless deployment, which is critical in high-density enterprise environments. Reference topics:Wireless Network Operation - Cisco wireless fabric architecture, fabric edge node role, user data termination, data-plane operations.
NEW QUESTION # 88
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?
Answer: C
Explanation:
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.
NEW QUESTION # 89
Which feature enables fast secure roaming in a wireless network?
Answer: C
Explanation:
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.
NEW QUESTION # 90
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