Packet Loss Priority JN0-664 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A network architect is designing a CoS strategy for a converged network that carries voice, video, and data. They want to ensure that during congestion, voice and video packets are less likely to be dropped than data packets. What is the primary mechanism in Junos CoS that achieves this?

   • AEnabling weighted random early detection (WRED) on all queues without PLP differentiation.
   • BUsing packet loss priority (PLP) to mark voice and video with low PLP and data with high PLP, then applying drop profiles that drop high-PLP packets more aggressively.
   • CAssigning higher scheduler priority to voice and video queues.
   • DConfiguring a rewrite rule that sets the forwarding class of voice and video to a higher priority.
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2. 17application · medium

   A network administrator is configuring CoS on a Junos router. They have created a drop profile that is intended to drop high-PLP packets more aggressively than low-PLP packets. However, after applying the drop profile to a scheduler, they notice that all packets are being dropped at the same rate. What is the most likely cause?

   • AThe drop profile was not applied to the correct scheduler.
   • BThe drop profile has only one fill level configured.
   • CThe classifier is not setting the PLP value, so all packets have the same PLP.
   • DThe rewrite rule is overriding the PLP value.
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4. 18application · medium

   A network administrator is configuring CoS on a router to support a new application that requires low latency and low loss. They have decided to use a multifield (MF) classifier to classify traffic based on source IP and DSCP. How can the administrator ensure that the MF classifier also sets the PLP appropriately?

   • AApply a rewrite rule on the ingress interface to set the PLP.
   • BUse a drop profile to set the PLP for the application's traffic.
   • CConfigure the MF classifier to set the PLP value in the classification term.
   • DThe MF classifier automatically sets PLP based on the forwarding class.
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5. 19foundation · easy

   In a Junos drop profile, how is packet loss priority (PLP) used?

   • AIt selects which drop profile is applied to the queue.
   • BIt defines the queue depth at which the profile is activated.
   • CIt determines the drop probability for packets at a given queue depth.
   • DIt sets the forwarding class for packets that are not dropped.
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6. 20foundation · easy

   During congestion, how does a Junos device use packet loss priority (PLP) to make drop decisions?

   • AIt applies a drop profile that gives high PLP packets a higher probability of being dropped than low PLP packets.
   • BIt ignores PLP and drops packets based only on queue depth.
   • CIt uses PLP to select a drop profile for the queue.
   • DIt drops all packets with high PLP before any low PLP packets.
   Reveal Solution Discussion Select an answer first