Ccna certification Practice Tests

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Appendix 

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  Answers to Practice Test Questions

 192.  A.  WLAN Quality of Service (QoS) is defined by IEEE 802.11e. The definitions align 

with the 802.1p, which is the wired equivalent called Architecture for Voice, Video and 

Integrated Data (AVVID). The IEEE 802.11r specification is used for BSS fast transition 

(FT) and does not pertain to QoS. The IEEE 802.11k specification is used for roaming 

clients to locate the closet WAP and does not pertain to QoS.

 193.  C.  MAC-based filtering is the best way you can achieve the goal of only allowing 

corporate hosts to connect to the network. You would need to preload into the WLC all of 

the MAC addresses that you want to allow access. Disabling the SSID from broadcasting 

is security through obscurity and only a deterrent; a savvy user can manually create a 

connection to the hidden SSID. Setting a unique pre-shared key (PSK) is only as secure as 

the people that know it; unfortunately at some point, it will leak out to others. Adding an 

LDAP server is the first step in setting up the web portal for user authentication and will 

not prevent users from joining their personal devices.

 194.  C.  802.11k should be enabled; this will allow client devices to download a list of 

neighboring wireless access points and their associated wireless bands. 802.11r is used 

for BSS fast transition (FT) by allowing authentication to be bypassed. 802.11e defines 

Quality of Service (QoS) for wireless communications. 802.11ac is a wireless standard for 

communication speed and equipment and does not pertain to neighboring WAP lists.

 195.  D.  The QoS profile of Platinum should be associated with the wireless VoIP phones. 

The Platinum QoS profile is normally associated with network control traffic and 

highly sensitive protocols such as VoIP. The Bronze QoS profile should be used for bulk 

data transfer, such as file transfers. The Silver QoS profile should be associated with 

transactional traffic, such as basic user forms. The Gold QoS profile should be reserved 

for lower priority time-sensitive protocols such as interactive video.

 196.  A.  The administrative status of the WLAN is disabled. This means that the WLAN will 

not allow associations. To fix the problem, it must be re-enabled and applied. Changing 

the Radio Policy value will not affect the solution because the WLAN is effectively 

administratively disabled. Enabling Multicast VLAN Feature will not correct the issue 

since many WLANs never need multicast support. Enabling the Broadcast SSID option 

would not accomplish anything because it could have been disabled already.

 197.  C.  This WLAN is configured for WPA2 personal; you can see that because the Pre-Shared 

Key (PSK) option is enabled and is filled out. The original WPA is not enabled. WPA2 

enterprise mode requires the use of certificates that cannot exist with PSK mode. 802.1X 

is not enabled, as you can see in the exhibit.

 198.  B.  Local mode creates a Control And Provisioning of Wireless Access Points (CAPWAP) 

tunnel to the wireless LAN controller to allow switching of VLANs local to the WLC. All 

traffic in Local mode must traverse back to the WLC to get switched into the respective 

VLANs. Flex Connect mode does not create a CAPWAP tunnel to mode data, only 

control information. Local mode allows for the switching of VLANs at the WLC only. 

Flex Connect mode is the opposite, where VLANs can be switched at the WAP.

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Chapter 3: IP Connectivity (Domain 3)