1.4 Interpret QoS Configurations 350-401 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   A QoS policy map on a Cisco router includes the following actions for a specific class: 'set dscp ef', 'police 1000000 2000 4000 conform-action transmit exceed-action drop', and 'priority 500'. Which QoS function is performed by the 'police' command in this configuration?

   • AIt shapes traffic to an average rate of 1 Mbps.
   • BIt reserves a minimum bandwidth of 500 kbps for the class.
   • CIt enforces a rate limit and takes action on excess traffic.
   • DIt marks all packets with DSCP EF.
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A network administrator applies a QoS policy to a router's interface in the outbound direction. The policy includes a class that matches DSCP AF21 and a policy map with bandwidth 512. What is the effect on AF21 traffic leaving the interface?

   • AAF21 traffic is guaranteed a minimum of 512 kbps during congestion
   • BAF21 traffic is limited to a maximum of 512 kbps
   • CAF21 traffic is marked with a new DSCP value
   • DAF21 traffic is shaped to an average rate of 512 kbps
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   An engineer applies the following policy to a router's interface: policy-map LIMIT class class-default police cir 8000000 bc 16000 be 16000 conform-action transmit exceed-action drop violate-action drop Which statement correctly describes the treatment of traffic that exceeds the committed burst but is within the excess burst?

   • AThe traffic is transmitted because it is within the excess burst.
   • BThe traffic is marked with a lower DSCP value and transmitted.
   • CThe traffic is dropped because the exceed-action is set to drop.
   • DThe traffic is buffered and sent later when the token bucket refills.
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A network engineer is configuring QoS on a router to ensure that voice traffic is never delayed by data traffic. The policy map includes a class for voice with the priority command and a class for bulk data with the bandwidth command. What is the correct interpretation of this configuration?

   • AVoice traffic is shaped to a rate and bulk data is policed to a rate
   • BVoice traffic is marked with a DSCP value and bulk data is re-marked
   • CVoice traffic is dropped when the queue is full and bulk data is always transmitted
   • DVoice traffic is placed in a strict priority queue and is always served before other queues, while bulk data receives a minimum bandwidth guarantee
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   An engineer is applying a QoS policy to a router interface. The policy uses a class map that matches DSCP CS6 and a policy map with the command: police cir 1000000 bc 10000 be 10000 conform-action set-dscp-transmit ef exceed-action drop violate-action drop. What is the effect on traffic that exceeds the committed burst?

   • ATraffic is re-marked to DSCP EF and transmitted
   • BTraffic is transmitted unchanged because the police command only applies to conforming traffic
   • CTraffic is dropped because the exceed-action is drop
   • DTraffic is shaped to the CIR and buffered
   Reveal Solution Discussion Select an answer first