Each port that is configured to use LACP has an LACP port priority. Which statements are true about LACP port priority？ （）

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  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.

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  A . 79xx IP phones do not automatically mark voice packets with non-zero DSCP values. B . 79xx IP phones do not mark protocol packets such as DHCP, DNS, or TFTP with non-zero DSCP values. C . 79xx IP phones do not mark voice packets with optimal DSCP values. D . 79xx IP phones use a custom protocol to communicate CDP information to the switch.

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• What will occur when a nonedge switch port that is configured for Rapid Spanning Tree does not receive a BPDU from its neighbor for three consecutive hello time intervals？（）

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• What value is primarily used to determine which port becomes the root port on each non root switch in a spanning-tree topology?（）

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• 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？（）https://assets.asklib.com/images/image2/2018072610064989265.jpg

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

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  A .  Trunk B .  Isolated C .  Primary D .  Community E .  Promiscuous F .  None of the other alternatives apply

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• Which of these is true regarding the configuration and application of port access control lists？ （）

  A . PACLs can be applied in the inbound or outbound direction of a Layer 2 physical interface.  B . At Layer 2， a MAC address PACL will take precedence over any existing Layer 3 PACL. C . When you apply a port ACL to a trunk port， the ACL filters traffic on all VLANs present on the trunk port. D . PACLs are not supported on EtherChannel interfaces.

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• What value is primarily used to determine which port becomes the root port on each nonroot switch in aspanning-tree topology？（）

  A . lowest port MAC address B . port priority number and MAC address. C . VTP revision number D . highest port priority number. E . path cost

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• An 802.1Q trunk is not coming up between two switches. The ports on both switches are configured as "switchport mode desirable." Assuming that there is no physical issue， choose two possible causes.（）

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