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.

A.The voice traffic cannot be forwarded to the distribution layer.
B.The voice traffic cannot use 802.1p priority tagging.
C.Port security cannot be enabled on the switch that is attached to the IP phone.
D.Quality of service cannot be applied for the voice traffic.

A.DSCP map needs to be configured for VOIP.
B.ToS has not been configured.
C.ToS has been misconfigured.
D.The command mls qos needs to be turned on in global configuration mode.
E.There is not a Cisco Phone attached to the interface.

A.The configuration establishes policed DSCP on ports Fa0/11 and Fa0/12 with values ranging  from 8 to 56.
B.The configuration overrides 802.1p priorities on packets entering ports Fa0/11 and Fa0/12 with  a value of 48.
C.Untagged Port VLAN ID （PVID） frames will carry voice traffic on VLAN 40.
D.Two IP phones with the MAC addresses of 0008.8595.d1a7 and 0007.8595.d2b7 are  connected to CAT1 ports Fa0/11 and Fa0/12， respectively.
E.Security violation shutdown mode has been activated for ports Fa0/11 and Fa0/12.
F.The configuration overrides the Quality of Service value in packets entering ports Fa0/11 and  Fa0/12 with a value of 45.

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

A.Classification and markingoccur using 802.1ab QoS bits before reaching the trust boundary.  
B.A device is trusted if it correctly declassifies packets. 
C.A device is trusted if it correctly classifies packets.
D.Network trust boundaries are automatically configured in IOS version 12.3 and later.  
E.The outermost trusted devices represent the trust boundary.
F.For scalability， classification should be done as close to the edge as possible.

A.CDP must be disabled on the switch port to prevent interference between CDP messages and  voice traffic.
B.Port security cannot be configured on a port that is configured for a voice vlan.
C.Static secure MAC addresses should be configured on voice vlan ports to prevent access by  devices other than IP phones.
D.CDP must be enabled on the switch port to allow configuration information to be passed to the  IP phone.
E.Portfast must be enabled on the switch port.
F.802.1x authentication cannot be configured on a port configured for a voice vlan.

A. Trust boundaries are points in the network where Layer 2 CoS markings are converted to Layer  3 DSCP or IP precedence markings.
B. Trust boundaries are a point in the network where QoS functionality begins and ends.
C. Trust boundaries determine whether certain types of traffic can pass.
D. Trust boundaries are a point in the network where decisions about CoS markings on incoming  packets are made.
E. None of the other alternatives apply

A.at the PC
B.at the access switch
C.at the IP phone
D.at the distribution switch

A.Trust boundaries are configured in the core of the network to provide the most efficient  forwarding based upon QoS markings，
B.Setting trust boundaries at the edge of the network allows intermediate hop devices to  administer QoS policies without detailed packet identification.
C.Trust boundaries are used to determine which QoS mechanism will be applied to the traffic.  
D.At the trust boundaries， the untrusted traffic will be marked with a new QoS value appropriate  for the policy in place at the point where the traffic entered the campus network.  
E.Trust boundaries define the firewall rules for QoS admission into a network.