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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
参考答案
更多 “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 portsB、Access ports that are configured with voice VLANs will always trust the CoS that is received from IP phonesC、Access ports that are configured with voice VLANs may or may not override the CoS value that is received from an IP phoneD、Voice VLANs are configured using the switchport voice vlan vlan-ID interface configuration commandE、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 portF、Enabling Voice VLAN on a switch port will automatically configure the port to trust the incoming CoS markings” 相关考题
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Which statement about vlan operation on cisco catalyst switches is true?()
A. when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table.B. unkown unicast frames are retransmitted only to the ports that belong to the same vlanC. ports between switches should be configured in access mode so that vlans can span across the portsD. broadcast and multicast frames are retransmitted to ports that are configured on different vlan.
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Which two statements about the use of VLANs to segment a network are true?()
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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 ports that are used in the networkD、Voice VLANs can be configured to forward existing CoS priorities or override themE、Voice VLANs are mainly used between access layer switches and distribution layer switchesF、Voice VLANs can be configured on Layer 2 ports only
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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 separateB、RTP provides end-to-end delivery services for voice trafficC、UDP is used to ensure a reliable transmission from sender to receiverD、RTP is used to provide resource reservation for the voice streamE、UDP provides multiplexing
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During voice implementation， which two required items are configured at an access layer switch connected to an IP phone to provide VoIP communication？（）A、allowed codecsB、native VLANC、auxiliary VLAND、Cisco Unified Communications Manager IP addressE、RSTP
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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.
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You need to configure a new Company Catalyst 3560 switch for a VOIP-enabled office. Which three statements are true about the voice VLAN feature on this switch？（）A、The default CoS value for incoming traffic is set up to 0.B、The CoS value is trusted for 802.1p or 802.1q tagged traffic.C、PortFast is automatically disabled when a voice VLAN is configured.D、The voice VLAN feature is disabled by default.E、The IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.F、When the voice VLAN feature is enabled， all untagged traffic is sent according to the default CoS priority of the port
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Which statement about vlan operation on cisco catalyst switches is true?（）A、when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table.B、unkown unicast frames are retransmitted only to the ports that belong to the same vlanC、ports between switches should be configured in access mode so that vlans can span across the portsD、broadcast and multicast frames are retransmitted to ports that are configured on different vlan.
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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.
考题
Which three statements are true about the voice VLAN feature on a Catalyst 2950 switch？ （Choose three.）（） A、 The CoS value is trusted for 802.1p or 802.1q tagged traffic.B、 The voice VLAN feature is disabled by default.C、 The IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.D、 When the voice VLAN feature is enabled， all untagged traffic is sent according to the default CoS priority of the port.E、 PortFast is automatically disabled when a voice VLAN is configured.F、 The default CoS value for incoming traffic is set to 0.
考题
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.
考题
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 insensitiveB、The ports may belong to a configurable data VLANC、The names of the VLANs used by the Smartports are not relevantD、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
考题
Which feature would prevent guest users from gaining network access by unplugging an IP phone and connecting a laptop computer？（）A、IPSec VPNB、SSL VPNC、port securityD、port security with statically configured MAC addressesE、private VLANs
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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.
考题
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 separateB、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.
考题
多选题Which two statements are true about the configuration of voice VLANs？（）AStatic secure MAC addresses can be configured in conjunction with voice VLANs.BPortFast is automatically enabled when voice VLANs are configured.CPortFast must be manually configured when voice VLANs are configured.DVoice VLANs are typically configured on uplink ports.EVoice VLANs are typically configured on access ports.
考题
多选题You have configured voice VLANs on Catalyst switch R1. Which two statements are true about the operation of voice VLANs on this device？ （）AWhen the voice VLAN feature is enabled， all untagged traffic is sent according to the default CoS priority of the port.BEnabling voice VLANs enables the switch to create multiple queues for traffic that is entering a port.CWhen voice VLANs are configured on a trunk link， UplinkFast must also be enabled.DVoice VLANs are configured to enable the switch to forward frames marked with the proper CoS values over separate physical links.EEnabling voice VLANs enables the switch to forward frames with a specific 802.1P marking.
考题
单选题Refer to the exhibit. What is the effect on the trust boundary of configuring the command mls qos trust cos on the switch port that is connected to the IP phone？（）A
Effectively the trust boundary has been moved to the IP phone.B
The host is now establishing the CoS value and has effectively become the trust boundary. C
The switch is rewriting packets it receives from the IP phone and determining the CoS value. D
The switch will no longer tag incoming voice packets and will trust the distribution layer switch to set theCoSE
RTP will be used to negotiate a CoS value based upon bandwidth utilization on the link.
考题
多选题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"？（）AThe names of the VLANs used by the SmartPorts are case insensitiveBThe ports may belong to a configurable data VLANCThe names of the VLANs used by the Smartports are not relevantDThe ports may belong to many VLANs， depending on how many PCs are connected to each port.EThe names of the VLANs used by the Smartports are case sensitive
考题
多选题During voice implementation， which two required items are configured at an access layer switch connected to an IP phone to provide VoIP communication？（）Aallowed codecsBnative VLANCauxiliary VLANDCisco Unified Communications Manager IP addressERSTP
考题
多选题Which two statements are true about voice VLANs？（）AVoice VLANs are only used when connecting an IP phone and a host to distinct switch portsBAccess ports that are configured with voice VLANs will always trust the CoS that is received from IP phonesCAccess ports that are configured with voice VLANs may or may not override the CoS value that is received from an IP phoneDVoice VLANs are configured using the switchport voice vlan vlan-ID interface configuration commandEVoice 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 portFEnabling Voice VLAN on a switch port will automatically configure the port to trust the incoming CoS markings
考题
多选题Which three statements are true about the voice VLAN feature on a Catalyst 2950 switch？ （Choose three.）（）AThe CoS value is trusted for 802.1p or 802.1q tagged traffic.BThe voice VLAN feature is disabled by default.CThe IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.DWhen the voice VLAN feature is enabled， all untagged traffic is sent according to the default CoS priority of the port.EPortFast is automatically disabled when a voice VLAN is configured.FThe default CoS value for incoming traffic is set to 0.
考题
单选题Which feature would prevent guest users from gaining network access by unplugging an IP phone and connecting a laptop computer？（）A
IPSec VPNB
SSL VPNC
port securityD
port security with statically configured MAC addressesE
private VLANs
考题
多选题Which two statements about voice VLANs are correct？（）AVoice VLANs eliminate the need for QoS configurationBVoice VLANs are used on trunk links to eliminate the need for QoS CoS markingsCVoice VLANs are mainly used to reduce the number of access switch ports that are used in the networkDVoice VLANs can be configured to forward existing CoS priorities or override themEVoice VLANs are mainly used between access layer switches and distribution layer switchesFVoice VLANs can be configured on Layer 2 ports only
考题
多选题You need to configure a new Company Catalyst 3560 switch for a VOIP-enabled office. Which three statements are true about the voice VLAN feature on this switch？（）AThe default CoS value for incoming traffic is set up to 0.BThe CoS value is trusted for 802.1p or 802.1q tagged traffic.CPortFast is automatically disabled when a voice VLAN is configured.DThe voice VLAN feature is disabled by default.EThe IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.FWhen the voice VLAN feature is enabled， all untagged traffic is sent according to the default CoS priority of the port
考题
单选题Which statement about vlan operation on cisco catalyst switches is true?（）A
when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table.B
unkown unicast frames are retransmitted only to the ports that belong to the same vlanC
ports between switches should be configured in access mode so that vlans can span across the portsD
broadcast and multicast frames are retransmitted to ports that are configured on different vlan.
考题
单选题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.
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