Packet Loss Priority JN0-664 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A network administrator is configuring CoS on a router to protect premium customers' traffic from loss during congestion. They have classified premium traffic with a low PLP and standard traffic with a high PLP. They want to ensure that when the queue is nearly full, standard traffic is dropped much more aggressively than premium traffic. What should the administrator do?

   • ACreate two separate queues, one for premium and one for standard, and assign a higher scheduler priority to the premium queue.
   • BApply a drop profile that has a steeper drop curve for high-PLP packets than for low-PLP packets.
   • CConfigure a policer on the premium traffic to limit its rate.
   • DUse a rewrite rule to set the PLP of premium traffic to high and standard traffic to low.
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2. 2expert · hard

   A network engineer is configuring CoS on a Junos router to support multiple services. They have a limited number of queues and need to ensure that premium customers' traffic is protected from loss during congestion. They have decided to use PLP to differentiate premium and standard traffic within the same forwarding class. What is the most effective way to configure this?

   • ACreate two separate forwarding classes and queues for premium and standard traffic.
   • BUse a BA classifier to set premium traffic to low PLP and standard traffic to high PLP, and apply a drop profile that drops high-PLP packets more aggressively.
   • CApply a rewrite rule that sets the PLP of premium traffic to high and standard traffic to low.
   • DConfigure a scheduler with a higher priority for premium traffic.
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4. 3foundation · easy

   How does packet loss priority (PLP) influence the behavior of a queue scheduler in Junos CoS?

   • APLP determines the queue's transmission rate.
   • BPLP has no effect on scheduling; it only affects drop decisions.
   • CPLP changes the priority of the queue in the scheduler.
   • DPLP selects which scheduler is used for the queue.
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5. 4foundation · easy

   Which Junos CoS component is responsible for assigning a packet loss priority (PLP) value to an incoming packet?

   • AClassifier
   • BDrop profile
   • CScheduler
   • DRewrite rule
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6. 5application · medium

   A network engineer is configuring CoS on a Junos router to support two classes of traffic: voice and data. They want voice traffic to be marked with low PLP and data traffic with high PLP. They have already created the forwarding classes and assigned them to queues. What is the next step to ensure the PLP marking is applied to the packets?

   • AApply a rewrite rule on the ingress interface to set the PLP.
   • BConfigure a behavior aggregate (BA) classifier that maps voice to low PLP and data to high PLP.
   • CCreate a drop profile that assigns low PLP to voice and high PLP to data.
   • DUse a scheduler that assigns low PLP to voice and high PLP to data.
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