多项选择题

VOIP is being implemented in the network and you need to assess the need for QoS. Which of thefollowing network problems would indicate a need to implement QoS features？（）

A.Mis-routed packets
B.Excess jitter
C.Delay of critical traffic
D.Packet loss due to congestion
E.Data link layer broadcast storms
F.FTP connections unsuccessful

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单项选择题

Refer to the exhibit. What is the effect when the switchport priority extend cos 3 command isconfigured on the switch port interface connected to the IP phone？（）

A.Effectively， the trust boundary has been moved to the PC attached to the IP phone
B.The computer is now establishing theCoS value and has effectively become the trust boundary
C.The IP phone is enabled to override with aCoS value of 3 the existing CoS marking of the PCattached to the IP phone
D.The switch will no longer tag incoming voice packets and will extend the trust boundary to thedistribution layer switch
E.RTP will be used to negotiate aCoS value based upon bandwidth utilization on the link

单项选择题

Based on the graphic below， which Catalyst switch interface command should be issued in orderfor the switch to instruct the phone to override the incoming CoS from the CK-PC before sendingthe packet to the switch？（）

A.switchport priority extend cos 11
B.switchport priority extend cos 2
C.mis qos cos 2
D.mis qos cos 2 override

多项选择题

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