When you enter the interface command auto qos voip cisco-phone on a port at the edge of a network,how does the Cisco Catalyst switch detect if a Cisco IP Phone is connected to the port?（）A、by snooping the CoS marking on the incoming framesB、by using RTP h

题目

When you enter the interface command auto qos voip cisco-phone on a port at the edge of a network,how does the Cisco Catalyst switch detect if a Cisco IP Phone is connected to the port?（）

  • A、by snooping the CoS marking on the incoming frames
  • B、by using RTP hello messages between the switch port and the Cisco IP Phone
  • C、by using CDP
  • D、by using DHCP snooping
  • E、by snooping the incoming 802.1Q VLAN tag
相似考题

1.As a network administrator, you issue the interface auto qos voip cisco-phone command on a port in an edge network. It is possible for a Cisco Catalyst switch to check if a Cisco IP Phone is directly attached to that port by:（）A. using DHCP snoopingB. snooping the incoming 802.1Q VLAN tagC. using CDPD. snooping the CoS marking on the incoming frames

2. You are configuring a Cisco multilayer switch for the Company network.  Which command would  you use to configure a port to act as a routed interface？（）A、 ip routingB、 switchport mode trunkC、 no switchportD、 switchport trunk native vlan 1E、 None of the other alternatives apply

3.Which three of these pre-requisite for resetting a Catalyst Express 500 switch when Cisco Network Assistant is unavailable？（）A、At Least one enabled switch port that is unconnected to any deviceB、A PC pre-configured with a specific IP Address and MaskC、A PC or laptop with Windows 2000 or Windows XP installed and a web browser that has Java Script enabledD、Physical Access to SwitchE、A Switch with no connected devices

4.When you enter the interface command auto qos voip cisco－phone on a port at the edge of a network,how does the Cisco Catalyst switch detect if a Cisco IP Phone is connected to the port?()A. by snooping the CoS marking on the incoming framesB. by using RTP hello messages between the switch port and the Cisco IP PhoneC. by using CDPD. by using DHCP snoopingE. by snooping the incoming 802.1Q VLAN tag

更多“When you enter the interface command auto qos voip cisco-phone on a port at the edge of a network,how does the Cisco Catalyst switch detect if a Cisco IP Phone is connected to the port?（）A、by snooping the CoS marking on the incoming framesB、by using RTP h”相关问题

  • 第1题：

    The Company network administrator has entered the "auto qos voip cisco-phone" command on  switch R1.  What does this command do？（）

    • A、It disables the trust boundary feature because the switch knows a Cisco IP phone is attached.
    • B、The switch assigns a CoS value of 5 to incoming packets.
    • C、If a Cisco IP phone is attached and removed， the switch continues to trust the CoS values as  long as the switch is not rebooted.
    • D、It turns on STP to see if a Cisco IP phone is attached.
    • E、If a Cisco IP phone is attached， the switch trusts the CoS.
    • F、None of the other alternatives apply.

    正确答案:E

  • 第2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

    正确答案:C,D

  • 第3题：

    When using Cisco Network Assistant to configure a WS-CE500-24LC switch， which three are available choices in the port settings window？（）

    • A、Duplex mode selections
    • B、Auto MDIX selections
    • C、Status Selections
    • D、Group mode selections
    • E、Port security selections

    正确答案:A,B,C

  • 第4题：

    Which of these commands can you use to show if an operational Catalyst switch port is set for autonegotiation of speed and duplex when running Cisco IOS software?（）

    • A、show port network
    • B、 show running-config
    • C、show controllers Ethernet-controller
    • D、 show interfaces

    正确答案:B

  • 第5题：

    You need to configure a new Cisco router to be installed in the VOIP network. Which threeinterface commands will configure the switch port to support a connected Cisco phone and to trustthe CoS values received on the port if CDP discovers that a Cisco phone is attached？（）

    • A、switchport voice vlan vlan-id
    • B、mls qos trust device cisco-phone
    • C、switchport priority extend cos_value
    • D、mls qos trust cos
    • E、mls qos trust override cos

    正确答案:A,B,D

  • 第6题：

    What accurately describes the usage of a Cisco AutoQoS command？（）

    • A、on Catalyst switches， the show auto discovery qos command is used to display the data collected during the Auto-Discovery phase
    • B、on Catalyst switches， the show auto qos command is used to display packet statistics of all classes that are configured for all service policies
    • C、on Cisco routers， the show mls qos maps command is used to verify the CoS-to-DSCP maps for egress packet queuing
    • D、on Cisco routers， the show auto qos command is used to display the AutoQoS interface templates， policy maps， class maps， and ACLs

    正确答案:D

  • 第7题：

    单选题
    When configuring a routed port on a Cisco multilayer switch， which of these is a required configuration task that you must perform to enable that port to function as a routed port？ （）
    A

    Enable the switch to participate in routing updates from external devices with the router command in global configuration mode.

    B

    Enter the no switchport command to disable Layer 2 functionality at the interface level.

    C

    Each port participating in routing of Layer 3 packets must have an IP routing protocol assigned on aperinterface level.

    D

    Routing is enabled by default on a multilayer switch， so the port can become a Layer 3 routing interface by assigning the appropriate IP address and subnet information.


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    As a network administrator, you issue the interface auto qos voip cisco-phone command on a port in an edge network. It is possible for a Cisco Catalyst switch to check if a Cisco IP Phone is directly attached to that port by:（）
    A

    using DHCP snooping

    B

    snooping the incoming 802.1Q VLAN tag

    C

    using CDP

    D

    snooping the CoS marking on the incoming frames


    正确答案： D
    解析： 暂无解析

  • 第9题：

    多选题
    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


    正确答案： A,E
    解析： 暂无解析

  • 第10题：

    单选题
    When you enter the interface command auto qos voip cisco-phone on a port at the edge of a network, how does the Cisco Catalyst switch detect if a Cisco IP Phone is connected to the port? （）
    A

    by snooping the CoS marking on the incoming frames

    B

    by using RTP hello messages between the switch port and the Cisco IP Phone

    C

    by using CDP

    D

    by using DHCP snooping

    E

    by snooping the incoming 802.1Q VLAN tag


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    What accurately describes the usage of a Cisco AutoQoS command？（）
    A

    on Catalyst switches， the show auto discovery qos command is used to display the data collected during the Auto-Discovery phase

    B

    on Catalyst switches， the show auto qos command is used to display packet statistics of all classes that are configured for all service policies

    C

    on Cisco routers， the show mls qos maps command is used to verify the CoS-to-DSCP maps for egress packet queuing

    D

    on Cisco routers， the show auto qos command is used to display the AutoQoS interface templates， policy maps， class maps， and ACLs


    正确答案： C
    解析： 暂无解析

  • 第12题：

    多选题
    Which three of these pre-requisite for resetting a Catalyst Express 500 switch when Cisco Network Assistant is unavailable？（）
    A

    At Least one enabled switch port that is unconnected to any device

    B

    A PC pre-configured with a specific IP Address and Mask

    C

    A PC or laptop with Windows 2000 or Windows XP installed and a web browser that has Java Script enabled

    D

    Physical Access to Switch

    E

    A Switch with no connected devices


    正确答案： A,C
    解析： 暂无解析

  • 第13题：

    What is the effect of applying the switchport trunk encapsulation dot1q command to a port on a Cisco Catalyst switch？（）

    • A、By default， native VLAN packets going out this port will be tagged.
    • B、Without an encapsulation command， 802.1Q will be the default encapsulation if DTP fails to negotiate a trunking protocol.
    • C、The interface will support the reception of tagged and untagged traffic.
    • D、If the device connected to this port is not 802.1Q-enabled， it will not be able to handle 802.1Q packets.

    正确答案:C

  • 第14题：

    When configuring a routed port on a Cisco multilayer switch， which of these is a required configuration task that you must perform to enable that port to function as a routed port？ （）

    • A、Enable the switch to participate in routing updates from external devices with the router command in global configuration mode.
    • B、Enter the no switchport command to disable Layer 2 functionality at the interface level.
    • C、Each port participating in routing of Layer 3 packets must have an IP routing protocol assigned on aperinterface level.
    • D、Routing is enabled by default on a multilayer switch， so the port can become a Layer 3 routing interface by assigning the appropriate IP address and subnet information.

    正确答案:B

  • 第15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？（）

    • 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

    正确答案:A,D,F

  • 第16题：

    In a Teleworker deployment with a single IP phone connected to a Cisco 831 router, select the true statement regarding Call Admission Control.（）

    • A、RSVP is a required configuration to support conference calls without voice packet loss. 
    • B、The QoS configuration on the 831 router must always provision sufficient bandwidth for two RTP streams. 
    • C、Call admission control is an issue only when using hardware DSP resources. 
    • D、When using the conference call features on a 7960 IP phone, only one RTP stream is present regardless of how many extensions are on the conference.

    正确答案:D

  • 第17题：

    As a network administrator, you issue the interface auto qos voip cisco-phone command on a port in an edge network. It is possible for a Cisco Catalyst switch to check if a Cisco IP Phone is directly attached to that port by:（）

    • A、using DHCP snooping
    • B、snooping the incoming 802.1Q VLAN tag
    • C、using CDP
    • D、snooping the CoS marking on the incoming frames

    正确答案:C

  • 第18题：

    You need to configure a new Cisco router to be installed in the Company VOIP network.  Which  three interface commands will configure the switch port to support a connected Cisco phone and  to trust the CoS values received on the port if CDP discovers that a Cisco phone is attached？ （）

    • A、switchport voice vlan vlan-id
    • B、mls qos trust device cisco-phone
    • C、switchport priority extend cos_value
    • D、mls qos trust cos
    • E、mls qos trust override cos

    正确答案:A,B,D

  • 第19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 theCoS

    E

     RTP will be used to negotiate a CoS value based upon bandwidth utilization on the link.


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    In a Teleworker deployment with a single IP phone connected to a Cisco 831 router, select the true statement regarding Call Admission Control.（）
    A

    RSVP is a required configuration to support conference calls without voice packet loss. 

    B

    The QoS configuration on the 831 router must always provision sufficient bandwidth for two RTP streams. 

    C

    Call admission control is an issue only when using hardware DSP resources. 

    D

    When using the conference call features on a 7960 IP phone, only one RTP stream is present regardless of how many extensions are on the conference.


    正确答案： D
    解析： 暂无解析

  • 第21题：

    多选题
    You need to configure a new Cisco router to be installed in the Company VOIP network.  Which  three interface commands will configure the switch port to support a connected Cisco phone and  to trust the CoS values received on the port if CDP discovers that a Cisco phone is attached？ （）
    A

    switchport voice vlan vlan-id

    B

    mls qos trust device cisco-phone

    C

    switchport priority extend cos_value

    D

    mls qos trust cos

    E

    mls qos trust override cos


    正确答案： C,A
    解析： 暂无解析

  • 第22题：

    单选题
    You are configuring a Cisco multilayer switch for the Company network.  Which command would  you use to configure a port to act as a routed interface？（）
    A

     ip routing

    B

     switchport mode trunk

    C

     no switchport

    D

     switchport trunk native vlan 1

    E

     None of the other alternatives apply


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    Refer to the exhibit. Which Catalyst switch interface command would be used to cause the switch to instruct the phone to override the incoming CoS from the PC before forwarding the packet to the switch？（）
    A

    switchport priority extend trust

    B

    switchport priority extend cos 2

    C

    switchport priority extend cos 11

    D

    mls qos cos 2

    E

    mls qos cos 2 override


    正确答案： D
    解析： 暂无解析

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