CoS Processing on Junos Devices JN0-650 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   How does a multifield (MF) classifier assign forwarding classes and loss priorities to packets?

   • ABy examining the output queue length and applying RED
   • BBy using a firewall filter that matches on multiple packet fields
   • CBy using a default classifier that assigns all packets to the best-effort queue
   • DBy reading a single DSCP value from the packet header
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   What does the scheduler use to determine how packets in different forwarding classes are transmitted?

   • AThe output queue associated with each forwarding class
   • BThe source IP address of the packet
   • CThe DSCP value in the packet header
   • DThe ingress interface of the packet
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   Which statement about BA classifiers is true?

   • AThey can examine multiple packet fields to make a classification decision
   • BThey are used only on egress to rewrite packet headers
   • CThey require a firewall filter to be configured
   • DThey are typically applied on ingress to map packets to forwarding classes and loss priorities
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A company wants to prioritize traffic from a specific application that uses TCP port 443 and originates from a particular subnet. The traffic does not have any DSCP markings. The engineer needs to assign this traffic to the expedited-forwarding (EF) forwarding class with low loss priority. Which configuration should be used?

   • AApply a policer that marks traffic with loss priority low and forwarding class EF
   • BApply a BA classifier that maps DSCP EF to forwarding class EF and loss priority low
   • CApply a multifield classifier that matches source address and TCP port, and sets forwarding class EF and loss priority low
   • DApply a fixed classifier that assigns all traffic to forwarding class EF and loss priority low
   Reveal Solution Discussion Select an answer first
6. 20expert · medium

   A network engineer is troubleshooting packet loss on a Junos router. They notice that packets with loss priority low are being dropped more often than packets with loss priority high. What is the most likely cause of this behavior?

   • AThe drop profile is configured with a higher drop probability for loss priority low
   • BThe classifier is mapping packets with loss priority low to a higher forwarding class
   • CThe policer is configured to drop packets with loss priority low
   • DThe scheduler is configured to prioritize packets with loss priority high
   Reveal Solution Discussion Select an answer first