Which two statements about voice VLANs are correct？（）

A.Voice VLANs eliminate the need for QoS configuration
B.Voice VLANs are used on trunk links to eliminate the need for QoS CoS markings
C.Voice VLANs are mainly used to reduce the number of access switch ports that are used in the network
D.Voice VLANs can be configured to forward existing CoS priorities or override them
E.Voice VLANs are mainly used between access layer switches and distribution layer switches
F.Voice VLANs can be configured on Layer 2 ports only

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多项选择题

Which two statements are true about voice VLANs？（）

A.Voice VLANs are only used when connecting an IP phone and a host to distinct switch ports
B.Access ports that are configured with voice VLANs will always trust the CoS that is received from IP phones
C.Access ports that are configured with voice VLANs may or may not override the CoS value that is received from an IP phone
D.Voice VLANs are configured using the switchport voice vlan vlan-ID interface configuration command
E.Voice VLANs provide a trunking interface between an IP phone and an access port on a switch to allow traffic from multiple devices that are connected to the port
F.Enabling Voice VLAN on a switch port will automatically configure the port to trust the incoming CoS markings

单项选择题

A client is searching for an access point （AP）. What is the correct process order that the client and access point go through to create a connection？（）

A.probe request/response， authentication request/response， association request/response
B.association request/response， authentication request/response， probe request/response
C.probe request/response， association request/response， authentication request/response
D.association request/response， probe request/response， authentication request/response

单项选择题

Refer to the exhibit. A Cisco Aironet Wireless LAN Client Adapter has been installed and configured through the ADU on the PC. The Aironet System Tray Utility （ASTU） has been enabled during the installation and the icon appears in the system tray area in the lower right of the desktop. What is thesignificance of the icon？（）

A.It indicates that the radio of the client adapter is disabled
B.It indicates that the client adapter is not associated to an access point or another client
C.It indicates that the client adapter is associated to an access point or another client， but the user is not EAP authenticated
D.It indicates that the client adapter is associated to an access point or another client， that the user is authenticated if the client adapter is configured for EAP authentication， and that the signal strength is excellent or good
E.It indicates that the client adapter is associated to an access point or another client， that the user is authenticated if the client adapter is configured for EAP authentication， and that the signal strength is fair
F.It indicates that the client adapter is associated to an access point or another client， that the user is authenticated if the client adapter is configured for EAP authentication， and that the signal strength is poor

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