多項(xiàng)選擇題

You have configured voice VLANs on Catalyst switch R1. 
Which two statements are true about the  operation of voice VLANs on this device? ()

A. When the voice VLAN feature is enabled, all untagged traffic is sent according to the default  CoS priority of the port.
B. Enabling voice VLANs enables the switch to create multiple queues for traffic that is entering a  port.
C. When voice VLANs are configured on a trunk link, UplinkFast must also be enabled.
D. Voice VLANs are configured to enable the switch to forward frames marked with the proper  CoS values over separate physical links.
E. Enabling voice VLANs enables the switch to forward frames with a specific 802.1P marking.


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1.單項(xiàng)選擇題

Refer to the exhibit.
 Which statement is true about the configuration that is shown? ()

A. Untagged ingress traffic will be dropped.
B. Ingress traffic from the host will be tagged with theCoS value of 5.
C. Tagged and untagged ingress traffic will be carried on VLAN 1.
D. Untagged ingress traffic will be marked with the default CoS value of the port.

2.單項(xiàng)選擇題

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.

3.多項(xiàng)選擇題

Refer to the exhibit.  
Which three statements are true about the voice VLAN configuration of the Catalyst switch? ()

A.The packet priority received from a device that is connected to the phone will be unmodified.
B.The packet priority received from a device that is connected to the phone will be overridden.
C.Incoming CoS values in packets from the connected phone will be left unmodified.
D.Packets without aCoS value that is set by the phone will be set to a value of 5.
E.Incoming CoS values in packets from the connected phone will be reset to a value of 5.
F.Packets without aCoS value that is set by the phone will be set to the default CoS value.

4.多項(xiàng)選擇題

The Cisco AutoQoS feature is being used throughout the Company VOIP network. 
Which three  statements about this feature are true?()

A.The "mls qos" global configuration command must be entered before configuring AutoQoS.
B.CEF must be enabled.
C.The "no auto qos voip" command is used to disable Cisco AutoQos and revoke all  configurations generated by Cisco AutoQos.
D.CDP must be enabled.
E.SNMP must be enabled.

5.單項(xiàng)選擇題

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.RTP will be used to negotiate aCoS value based upon bandwidth utilization on the link.
C.The switch is rewriting packets it receives from the IP phone and determining theCoS value.  
D.The switch will no longer tag incoming voice packets and will trust the distribution layer switch  to set theCoS.
E.The host is now establishing theCoS value and has effectively become the trust boundary.


6.單項(xiàng)選擇題

Refer to the exhibit. 
Which switch interface configuration command would automatically configure  quality of service (QoS) for voice over IP (VoIP) within a QoS domain? ()

A.switchport priority extend trust  
B.mls qos trust
C.switchport priority extend cos 7  
D.auto qos voip cisco-phone

7.單項(xiàng)選擇題

Refer to the exhibit. A trunk link is connected between switch A_SW and switch D_SW. Based on  the configuration shown in the exhibit, 
how would the traffic coming from the switch A_SW be  managed?()

A.The trunk port Fa0/1 on switch A_SW will trust allCoS values on the frames coming from the IP  phone.
B.The trunk port Fa0/1 on switch A_SW will trust allCoS values on the frames received on the IP  phone.
C.The trunk port Fa0/1 on switch D_SW will trust allCoS values on the frames coming from port  Fa0/1 on A_SW.
D.The trunk port Fa0/1 on switch D_SW will trust allCoS values on the frames received on the  A_SW switch port Fa0/4.
E.The trunk port Fa0/1 on switch D_SW will trust allCoS values on the frames received on the IP  phone port.

8.單項(xiàng)選擇題

The Company network is displayed in the following topology exhibit:

Workstation 1 traffic is set for cos 5 and the switch CompanyA sends workstation 1 traffic to the  switch CompanyB. However, not all of the traffic from Switch CompanyA is from workstation 1.  Switch CompanyA configurations Switch CompanyB Configuration:  
mlsqos mls qos  
interfacefa0/1 interface fa0/1  
switchportmode trunk switchport trunk mode  
switchporttrunk encapsulation dot 1q switchport trunk encapsulation dot 1q  
switchporttrunk native vlan 1 switchport trunk native vlan 1  
Frames from Workstation 1 are given the rightful priority through Switch CompanyA, but Switch CompanyB doesn’t reciprocate, and treats Workstation 1 frames as if they have no precedence. Which of the following actions will prioritize traffic from Workstation 1?()

A. Configure qos all command under Switch CompanyB fa0/1 interface.
B. Configure mls qos trust cos command under Switch CompanyB fa0/1 interface.
C. Configure mls qos trust cos 5 command under Switch CompanyB fa0/1 interface.
D. Configure qos cos 5 command under Switch CompanyB fa0/1 interface.
E. Configure mls qos trust cos command under Switch CompanyA fa0/1 interface.
F. Configure qos cos 5 command under Switch CompanyA fa0/1 interface.

9.多項(xiàng)選擇題

VOIP is being implemented in the Company network and you need to assess the need for QoS.  
Which of the following 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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