| Exam 400-101 | Question id=839 | Infrastructure Services |
You issue the following commands on Router1:
Router1(config)#class-map voice
Router1(config-cmap)#match protocol rtp audio
Router1(config-cmap)#exit
Router1(config)#policy-map exsim
Router1(config-pmap)#class voice
Router1(config-pmap-c)#priority percent 10
Router1(config-pmap-c)#exit
Router1(config-pmap)#class class-default
Router1(config-pmap-c)#bandwidth percent remaining
Router1(config-pmap-c)#exit
Router1(config-pmap)#exit
Router1(config)#policy-map kyiv
Router1(config-pmap)#class class-default
Router1(config-pmap-c)#shape peak 50000000
Router1(config-pmap-c)#service-policy exsim
Router1(config-pmap-c)#exit
Router1(config-pmap)#exit
Router1(config)#interface fa0/1
Router1(config-if)#service-policy output kyiv
Which of the following statements are correct?
| A. |
Voice traffic is given priority up to a bandwidth of 5 Mbps. | |
| B. |
Voice traffic is given priority up to a bandwidth of 10 Mbps. | |
| C. |
Voice traffic is given priority up to a bandwidth of 50 Mbps. | |
| D. |
Traffic is configured to strictly conform to the CIR. | |
| E. |
Traffic might be dropped when the network becomes congested. |
Voice traffic is given priority up to a bandwidth of 5 Mbps. However, traffic might be dropped when the network is congested. The FastEthernet 0/1 interface is configured with a service policy named kyiv, which references a child service policy named exsim. All traffic is considered first by the parent policy, then by the child policy.
The parent service policy is configured with the shape peak 50000000 command. The peak keyword indicates that peak shaping should occur. Peak shaping allows higher bursts than average shaping allows, but occasional packet drops can occur when the network is congested. The average keyword can be used with the shape command to ensure that the traffic strictly conforms to the committed information rate (CIR). The variable for the shape command is the CIR, which is specified in bits per second.
Voice traffic is matched in the child policy named exsim. The priority percent 10 command indicates that 10 percent of the bandwidth is guaranteed to the traffic class. In this scenario, the traffic is first shaped by the parent policy to a value of 50 Mbps. Therefore, 10 percent of this value is 5 Mbps.