单项选择题

You are a network administrator of a large investor relations company that uses a switchednetwork to carry both data and IP telephony services. Why should you carry voice traffic on aseparate VLAN？（）

A.IP phones require inline power and must be in separate VLAN to receive inline power
B.IP telephony applications require prioritization over other traffic as they are more delaysensitive
C.IP phones can only receive IP addresses through DHCP if they are in separate VLAN
D.The CDP frames from the IP phone can only be recognized by the switch if the phone is in anauxiliary vlan

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热门试题

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

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

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