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質問 # 51
A network administrator at a marketing company manages a Cisco Catalyst 9800 Series Wireless Controller running Cisco IOS XE 17.x. The WLAN named XYZ-Guest is set up for visitors, and the administrator wants to implement a web authentication (WebAuth) portal using an external server to manage guest access. To ensure seamless and secure guest authentication, the controller must be configured to use an external WebAuth server for the WLAN. The administrator must configure the XYZ-Guest WLAN to use an external WebAuth server with a parameter map named webauth-ext. Which set of Cisco IOS XE commands must be used?
正解:A
解説:
On a Cisco Catalyst 9800 WLC, the WLAN is entered with the wlan command, and the WebAuth parameter map is applied under the WLAN using the security web-auth parameter-map command so the guest WLAN uses the configured external WebAuth portal settings.
質問 # 52
What is an attribute of the workgroup bridge mode for an AP in a wireless network?
正解:B
解説:
The workgroup bridge mode on a Cisco access point is designed to integrate a wired network segment into an existing wireless infrastructure. In this mode, the AP acts as a client to a root AP or wireless controller-managed network, bridging Ethernet-connected devices on its wired ports to the wireless LAN. This is commonly deployed in environments where wired devices, such as printers, legacy systems, or isolated office equipment, require network connectivity but cannot directly connect to the wired backbone.
Traffic from devices on the wired segment is encapsulated and transmitted over the wireless link to the root AP, effectively extending network access without running physical cabling. Unlike bridging between multiple AP radios (2.4 GHz vs. 5 GHz), or providing inter-Ethernet port forwarding, the primary attribute of a workgroup bridge is wireless-to-wired integration, not radio- to-radio communication or internal LAN segmentation. Broadcast domains are limited to the bridged wired segment and the wireless uplink; they are not automatically extended across all interfaces without VLAN configuration.
Cisco deployment guides emphasize that workgroup bridge mode is ideal for connecting remote wired clusters to a centralized WLAN, providing seamless connectivity while maintaining security and management under the controller or root AP.
質問 # 53
What happens when a radio wave bends around objects?
正解:D
解説:
When a radio wavebends around an obstaclein its path, this phenomenon is calleddiffraction. Diffraction allows the RF signal to reach areas that are not in the direct line of sight of the transmitter, such as behind walls, corners, or other obstructions. The amount of bending depends on the wavelength of the signal relative to the size of the obstacle-longer wavelengths (lower frequencies) diffract more effectively than shorter wavelengths.
This property is crucial in wireless network design, especially in enterprise or mesh deployments, because it enables coverage in complex indoor environments and around obstructions where direct line-of-sight communication is impossible. Diffraction differs from other RF phenomena:absorption(option A) occurs when RF energy is partially absorbed by materials, reducing signal strength;diffusion(option B) refers to scattering of the signal in multiple directions; andreflection(option C) occurs when RF waves bounce off surfaces like walls or ceilings, which can lead to multipath interference.
Cisco wireless design guides emphasize understanding diffraction forcoverage planning, AP placement, and optimizing signal propagationin indoor and campus deployments, ensuring that signals can adequately reach shadowed or obstructed areas without excessive loss or dead spots. Reference topic:RF Fundamentals - diffraction, reflection, absorption, and indoor wireless propagation.
質問 # 54
Which feature does a high-gain patch antenna impart to a wireless signal?
正解:B
解説:
A high-gain patch antenna is a directional antenna that concentrates RF energy into a defined coverage area rather than radiating equally in all directions. Cisco's Wireless RF Reference Guide explains that antenna gain determines how RF power is radiated and that higher-gain antennas do not create additional transmit power; they focus existing power in a given direction.
Cisco also distinguishes omnidirectional high-gain patterns, which flatten coverage, from directional antennas, which focus energy toward a target area.
That makes option C correct: a patch antenna imparts a focused beam, typically useful for covering a hallway, warehouse aisle, seating section, point-to-point link, or defined flat service area. Cisco's antenna documentation also states that higher-gain antennas provide longer coverage distance but with a coverage-area tradeoff, especially in a particular direction. Option A is incorrect because antenna gain does not restrict operation to a single narrow frequency; frequency support is determined by antenna design and radio band. Option B describes channel overlap, not antenna behavior. Option D does not describe a standard patch antenna radiation pattern.
質問 # 55
An engineer must prevent unauthorized rogue APs from connecting to the enterprise wired network. Which Cisco feature best addresses this requirement?
正解:C
解説:
Rogue containment identifies unauthorized access points connected to the network and can actively disrupt associated wireless clients to mitigate threats. CleanAir detects RF interference, while ClientLink and Optimized Roaming improve client performance rather than network security enforcement against rogue devices.
質問 # 56
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