Which two statements about voice VLANs are correct？（）A、Voice VLANs eliminate the need for QoS configurationB、Voice VLANs are used on trunk links to eliminate the need for QoS CoS markingsC、Voice VLANs are mainly used to reduce the number of access switch 

第1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2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3题：

Which statement is true about voice VLANs？ （）

• A、When the voice VLAN feature is enabled， all untagged voice and data traffic is sent through the voice VLAN.
• B、The voice VLAN feature is enabled by default.
• C、The IP phone overrides the priority of all incoming data traffic （tagged and untagged） and sets the CoS value to 0.
• D、The default CoS value is 1 for incoming voice and data traffic.

第4题：

Which two statements are true about network voice traffic？ （Choose two.）（）

• A、 Voice traffic is affected more by link speed than FTP traffic is.
• B、 Voice traffic is affected more by packet delays than FTP traffic is.
• C、 Voice streams involve larger packet sizes than most TCP network traffic involves.
• D、 Voice traffic is more sensitive to packet loss than TCP network traffic is.
• E、 Voice traffic requires QOS mechanisms only in heavily loaded network segments.

第5题：

Which two statements correctly identify factors to consider when Configuring WAN QoS？（）

• A、Voice Traffic uses Assured Forwarding
• B、Voice Signaling traffic uses Assured Forwarding
• C、Voice Signaling traffic uses priority queuing
• D、Voice Traffic uses priority queuing
• E、Voice signaling traffic should use priority queuing with Assured Forwarding

第6题：

You need to design the VLAN scheme for the Company network. Which two statements are true  about best practices in VLAN design？（）

• A、Routing should occur at the access layer ifvoice VLANs are utilized. Otherwise， routing should occur at the distribution layer.
• B、Routing should always be performed at the distribution layer.
• C、VLANs should be localized to a switch.
• D、VLANs should be localized to a single switch unlessvoice VLANs are being utilized.
• E、Routing should not be performed between VLANs located on separate switches.

第7题：

Which two statements are true about the protocols that are used for transmitting voice traffic？（）

• A、RTP multiplexing is used to keep multiple phone conversations separate
• B、RTP provides end-to-end delivery services for voice traffic.
• C、UDP is used to ensure a reliable transmission from sender to receiver.
• D、RTP is used to provide resource reservation for the voice stream.
• E、UDP provides multiplexing of multiple phone conversations.

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第13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14题：

Which two statements are true about the configuration of voice VLANs？（）

• A、Static secure MAC addresses can be configured in conjunction with voice VLANs.
• B、PortFast is automatically enabled when voice VLANs are configured.
• C、PortFast must be manually configured when voice VLANs are configured.
• D、Voice VLANs are typically configured on uplink ports.
• E、Voice VLANs are typically configured on access ports.

第15题：

In an environment in which multiple VLANs have been defined on Catalyst Express 500 switches， which two statements are correct for ports that have been configured with the Smartport role of "IP Phone + Desktop"？（）

• A、The names of the VLANs used by the SmartPorts are case insensitive
• B、The ports may belong to a configurable data VLAN
• C、The names of the VLANs used by the Smartports are not relevant
• D、The ports may belong to many VLANs， depending on how many PCs are connected to each port.
• E、The names of the VLANs used by the Smartports are case sensitive

第16题：

When QoS levels in the Cisco Wireless Control System （WCS） are entered， which profile names are used to identify the access categories？（）

• A、 platinum， gold， silver， and bronze
• B、 voice， gold， silver， and bronze
• C、 low delay， network critical， business， best effort
• D、 voice， video， background gold， background silver， and best effort
• E、 voice， video， best effort， and background
• F、 voice， video， best effort， background， and scavenger

第17题：

Which two statements are true about the function of CAC？（）

• A、CAC provides guaranteed voice quality on a link.
• B、CAC artificially limits the number of concurrent voice calls.
• C、CAC is used to control the amount of bandwidth that is taken by a call on a link.
• D、CAC prevents oversubscription of WAN resources that is caused by too much voice traffic.
• E、CAC allows an unlimited number of voice calls while severely restricting，if necessary，other forms of traffic.
• F、CAC solves voice congestion problems by using QoS to give priority to UDP traffic.

第18题：

Which two statements about the use of VLANs to segment a network are true? （）

• A、VLANs increase the size of collision domains.
• B、VLANs allow logical grouping of users by function.
• C、VLANs simplify switch administration.
• D、VLANs enhance network security.

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