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問題 #111
In an RF environment, what does high interference result in?
答案：B
解題說明：
High interference in a wireless RF environment disrupts the predictable behavior of 802.11 channels. Interference comes from co-channel devices, neighboring APs, non-Wi-Fi sources like microwave ovens, cordless phones, or other electronic equipment operating in the same frequency band. When interference is present, the channel experiences fluctuating noise levels, increased frame collisions, and packet loss, all of which lead to inconsistent channel performance.
This inconsistency manifests as variable throughput, increased retransmissions, and irregular latency, directly impacting both client experience and AP scheduling decisions. While frame aggregation may fail under interference, the primary and systemic effect is the variability in channel quality, not the failure of aggregation alone. Scheduled contention access (option C) is an intentional protocol mechanism of EDCA or TXOP scheduling, which operates independently of interference levels. Extended coverage patterns (option D) are the result of antenna design or AP placement, not RF interference.
Cisco's Wireless Design Guide emphasizes that RF interference results in erratic channel behavior, requiring careful channel planning, power adjustment, and spectrum analysis using tools such as Cisco DNA Spaces or Spectrum Expert to restore consistent performance.
問題 #112
Which result is produced using a power ratio of 10:1 in standard decibel calculations?
答案：C
解題說明：
In decibel calculations, the formula used to convert a power ratio to decibels (dB) is:
Thus, the power ratio of 10:1 corresponds to a10 dBchange in power.
Option A: -20 dBwould correspond to a ratio of 0.01:1, not 10:1.
Option B: 5 dBwould correspond to a power ratio of approximately 3.16:1, not 10:1.
Option D: 15 dBwould correspond to a ratio of 31.62:1, not 10:1.
Therefore,Option C: 10 dBis the correct answer, as it is the result of a power ratio of 10:1.
Thus, the power ratio of 10:1 corresponds to a10 dBchange in power.
Option A: -20 dBwould correspond to a ratio of 0.01:1, not 10:1.
Option B: 5 dBwould correspond to a power ratio of approximately 3.16:1, not 10:1.
Option D: 15 dBwould correspond to a ratio of 31.62:1, not 10:1.
Therefore,Option C: 10 dBis the correct answer, as it is the result of a power ratio of 10:1.
問題 #113
Refer to the exhibit. A WLC is deployed at a branch location to facilitate secure client connectivity.
A network engineer configures one WLAN using WPA2 Personal passphrase and activates ASCII format key to align with company security policies. Which configuration enables client authentication for this WLAN?
答案：C
解題說明：
WPA2-Personal authenticates clients with a preshared key, not with 802.1X. Cisco documents WPA/WPA2 as supporting multiple authentication methods, including 802.1X and PSK, and specifically states that when PSK is selected, a preshared key or passphrase must be configured.
The configuration element that enables client authentication in this scenario is the PSK ASCII key function represented by option D. On Catalyst 9800 IOS XE, the PSK method is enabled with PSK authentication key management, and the passphrase is defined with security wpa psk set- key {ascii | hex} {0 | 8} password; Cisco's example is security wpa psk set-key ascii 0 test.
Option A disables 802.1X AKM, which is appropriate for Personal mode, but it does not by itself authenticate clients. Option B controls DHCP proxy behavior and has no role in WPA authentication. Option C enables AES for WPA2 encryption, which protects traffic confidentiality but does not supply the authentication secret.
問題 #114
What is a characteristic of 20 MHz channel width in a wireless network?
答案：B
解題說明：
In wireless networks, the 20 MHz channel width is the standard and narrowest channel allocation in the 2.4 GHz frequency band. Using narrower channels reduces adjacent-channel interference and allows for better coexistence in high-density environments, which is particularly important in the crowded 2.4 GHz spectrum. A 20 MHz channel uses less RF bandwidth than 40 MHz or 80 MHz channels, providing more non-overlapping channels (channels 1, 6, and 11 in 2.4 GHz) to reduce co- channel interference.
問題 #115 
Refer to the exhibit. A wireless controller is deployed at a branch location to facilitate secure client connectivity. A network engineer configures a WLAN using 802.1X to align with company security policies.
Which configuration enables client authentication for this WLAN?
答案：D
解題說明：
The command that enables 802.1X client authentication for this WLAN issecurity dot1x authentication-list ISE_GROUP. On a Cisco Catalyst 9800 WLC, the WLAN configuration defines Layer 2 security behavior, including whether the SSID uses 802.1X and which AAA method list is used for EAP/RADIUS authentication. Cisco documents the CLI workflow for 802.1X WLAN authentication as entering WLAN configuration mode and applyingsecurity dot1x authentication-list < authenticate-list-name > , explicitly describing this as the step to enable the authentication list for 802.1X security. Cisco's Catalyst 9800 configuration example also shows the exact formsecurity dot1x authentication-list ISE_GROUPand states that the WLAN is then configured with 802.1X authentication.
no ip mac-bindingdisables IP-to-MAC binding checks and does not select a RADIUS method list.aaa override enableallows authorization attributes from AAA/ISE to be applied after authentication, but it does not initiate
802.1X authentication.wlan branch1 policy branch1_policymaps the WLAN to a policy profile through a policy tag, but it is not the authentication command. Reference topics:802.1X WLAN security, RADIUS AAA method lists, Catalyst 9800 WLAN configuration, and secure client onboarding.
問題 #116
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