单项选择题
According to the information presented in the following exhibit， can you tell me the reason that thetrust state of interface FastEthernet 0/3 displays "not trusted"？（）
A.The command mis qos needs to be turned on in global configuration mode
B.DSCP map needs to be configured for VOIP
C.ToS has not been configured
D.There is not a Cisco Phone attached to the interface
相关考题
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单项选择题
JitteriscausingproblemswiththeVOIPapplicationinthenetwork.Whatcausesnetworkjitter？（）
A.Variable queue delays
B.Packet drops
C.Transmitting too many small packets
D.Compression -
多项选择题
VOIPisbeingimplementedinthenetworkandyouneedtoassesstheneedforQoS.WhichofthefollowingnetworkproblemswouldindicateaneedtoimplementQoSfeatures？（）
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 -
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
