Configure or Monitor CoS JN0-664 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   What is the purpose of defining a forwarding class in Junos CoS configuration?

   • ATo define the drop profile used for congestion management.
   • BTo group packets into a queue and associate them with a scheduling priority.
   • CTo determine the buffer size for each queue.
   • DTo specify the DSCP value to be set on outgoing packets.
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A network operator is tuning CoS on a congested link. They want to use a drop profile to manage congestion for the best-effort queue. The profile should start dropping packets when the queue depth reaches 50% and drop all packets when the queue is full. The engineer has created a drop profile with the following fill-levels and drop-probabilities: (50, 0), (100, 100). What is the expected behavior of this drop profile?

   • AThe profile will drop packets with a probability of 50% when the queue is 50% full.
   • BThe profile will not drop any packets until the queue is completely full, then drop all packets.
   • CThe profile will drop all packets once the queue depth exceeds 50%.
   • DThe profile will begin dropping packets at 50% queue depth, with the drop probability increasing linearly to 100% at full queue depth.
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A network engineer is configuring CoS on a Juniper router to support four traffic classes: voice, video, network control, and best effort. The voice queue must have the highest scheduling priority, the video queue must have a guaranteed transmit rate, and the best-effort queue should use the remaining bandwidth. The engineer has already created the forwarding classes. What is the next step in the configuration process?

   • AApply the forwarding classes directly to the physical interface using the [edit class-of-service interfaces] hierarchy.
   • BConfigure a rewrite rule to mark the outgoing packets based on the forwarding class.
   • CCreate schedulers for each forwarding class and then associate them with the forwarding classes using a scheduler map.
   • DApply a classifier to the ingress interface to assign traffic to the forwarding classes.
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   Which command is used to verify the CoS configuration on a Juniper device?

   • Ashow configuration
   • Bshow route
   • Cshow class-of-service
   • Dshow interfaces queue
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   Which CoS components are typically applied to an interface?

   • AClassifier, scheduler map, and rewrite rule
   • BClassifier, drop profile, and scheduler
   • CForwarding class, scheduler, and drop profile
   • DRewrite rule, forwarding class, and scheduler map
   Reveal Solution Discussion Select an answer first