1.4 Interpret QoS Configurations 350-401 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A network engineer is troubleshooting QoS on a router. The policy map includes a class that matches DSCP AF41 and sets the precedence to 4. What is the effect of this configuration on packets that arrive with DSCP AF41?

   • AThe DSCP value remains AF41 because precedence and DSCP are independent
   • BThe packet is dropped because AF41 is not a valid DSCP value
   • CThe packet is queued in a priority queue because precedence 4 is set
   • DThe DSCP value is changed to a value that corresponds to precedence 4, which is DSCP 32
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   A network engineer is configuring QoS on a Cisco router. The goal is to mark voice traffic with DSCP EF. Which configuration element is used to define the match criteria for voice traffic?

   • APolicy map
   • BService policy
   • CAccess control list (ACL)
   • DClass map
   Reveal Solution Discussion Select an answer first
4. 8expert · hard

   A network administrator is configuring QoS on a WAN router. The router connects to an ISP with a committed access rate (CAR) of 10 Mbps. The administrator wants to ensure that traffic does not exceed the CAR, but also wants to allow bursts up to 20,000 bytes. The administrator applies a policy with the command: police cir 10000000 bc 20000 be 20000 conform-action transmit exceed-action drop violate-action drop. What is the primary limitation of this configuration?

   • AThe police command does not allow bursts, so the configuration is ineffective
   • BThe police command is applied inbound, so it does not affect outbound traffic
   • CThe police command drops excess traffic, which may cause TCP retransmissions and poor application performance
   • DThe police command shapes traffic to the CIR, which introduces delay
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   An engineer applies a QoS policy to a router interface that connects to an ISP. The policy uses a class map matching DSCP EF and a policy map with the command: police cir 2000000 bc 20000 be 20000 conform-action transmit exceed-action drop violate-action drop. What is the primary effect of this configuration on EF-marked traffic?

   • ATraffic is marked with a new DSCP value and transmitted regardless of rate
   • BTraffic is queued in a low-latency queue and prioritized over other traffic
   • CTraffic is shaped to an average rate of 2 Mbps with bursts up to 40,000 bytes
   • DTraffic is limited to a committed rate of 2 Mbps; bursts up to 20,000 bytes are allowed, and excess is dropped
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   In a Cisco policing configuration, what does the committed information rate (CIR) specify?

   • AThe average rate at which traffic is allowed to be sent.
   • BThe maximum burst size allowed.
   • CThe excess burst size allowed.
   • DThe priority of the traffic.
   Reveal Solution Discussion Select an answer first