Which statement is true about voice VLANs？ （）

第1题：

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

第2题：

You have configured voice VLANs on Catalyst switch R1.  Which two statements are true about the  operation of voice VLANs on this device？ （）

• A、 When the voice VLAN feature is enabled， all untagged traffic is sent according to the default  CoS priority of the port.
• B、 Enabling voice VLANs enables the switch to create multiple queues for traffic that is entering a  port.
• C、 When voice VLANs are configured on a trunk link， UplinkFast must also be enabled.
• D、 Voice VLANs are configured to enable the switch to forward frames marked with the proper  CoS values over separate physical links.
• E、 Enabling voice VLANs enables the switch to forward frames with a specific 802.1P marking.

第3题：

第4题：

Which statement is true about logical units?（）

• A、Logical units are similar to VLANs used by other vendors.
• B、A logical unit is required for transit interfaces.
• C、Frame Relay encapsulation supports one logical unit.
• D、Link speed and duplex are configured in the logical unit properties.

第5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

第6题：

Which statement is true about the capabilities of a voice gateway router？（）

• A、voice gateways with analog interfaces need a gatekeeper to convert analog signals into digital format before voice is encapsulated into IP packets
• B、voice gateways need a gatekeeper to interconnect the VoIP networks the PSTN network
• C、voice gateways with Cisco Unified CallManager Express （CME） can permanently act as a call agent for IP phones
• D、voice gateways equipped with a DSP module can take the role of the call agent during WAN failure.

第7题：

Which statement ab0ut VLANs in a Cisco UCS is true?（）

• A、Fabric interconnect can never participate in VTP
• B、Fabric interconnect supports ISL and 802.1Q trunking
• C、The supported range of VLANs is auto-configured by UCS
• D、VLANs are configured through the Cisco UCS manager. （fabric interconnect may be set up in switch mode）

第8题：

第9题：

A switch has been configured with two vlans and is connected to a router with a trunk for inter-vlan routing.OSPF has been configured on the router，as the routing protocol for the network.Which statement about thisnetwork is true？（）

• A、For the two vlans to communicate，a network statement for the trunk interface needs to be added to the  OSPF configuration.
• B、For the two vlans to communicate， a network statement for each subinterface needs to be  added  to the OSPF configuration.
• C、Direct inter-vlan communication does not require OSPF
• D、OSPF cannot be used if router-on-a-stick is configured on the router

第10题：

Which statement is true about IBGP routers? （）

• A、They must be fully meshed
• B、They can be in a different AS
• C、They must be directly connected