Forwarding Classes and Classification JN0-664 Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   A service provider is configuring CoS on a router that receives traffic from multiple sources. They want to apply a custom BA classifier to an interface, but they also need to ensure that traffic from a specific source is classified using a different classifier. Which configuration approach should they use?

   • AApply the custom BA classifier to the interface and use a firewall filter to reclassify traffic from the specific source.
   • BApply two BA classifiers to the same interface, one for the specific source and one for all other traffic.
   • CUse a rewrite rule to change the DSCP value of traffic from the specific source before classification.
   • DEnable default classification, which will automatically use the correct classifier for each source.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   Which statement correctly describes the relationship between forwarding classes and queues in Junos CoS?

   • AForwarding classes are assigned by the scheduler based on queue depth
   • BEach forwarding class is mapped to a single queue on an interface
   • CForwarding classes are only used for traffic that is destined to the Routing Engine
   • DEach forwarding class can be mapped to multiple queues simultaneously
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A customer has a mix of traffic that needs to be classified into different forwarding classes based on source IP, destination port, and DSCP value. You need to implement a classification solution that can handle this complex matching. Which approach should you use?

   • AUse multiple BA classifiers, one for each field, and apply them all to the interface.
   • BUse a rewrite rule to set the forwarding class based on the fields.
   • CUse a multifield classifier with firewall filter terms that match the required fields and assign forwarding classes.
   • DUse a single BA classifier that matches all three fields.
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A service provider wants to ensure that routing protocol traffic (e.g., BGP, OSPF) is always placed in the network-control forwarding class, even if the packets arrive with a different DSCP value. Which configuration approach should be used?

   • AUse a rewrite rule to set the DSCP value to network-control on all routing protocol traffic.
   • BApply a BA classifier that maps the DSCP values used by routing protocols to the network-control class.
   • CRely on the default classification, which automatically places all routing protocol traffic in the network-control class.
   • DApply a multifield classifier that matches the protocol (e.g., OSPF, BGP) and assigns the network-control forwarding class.
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   What is the primary difference between multifield (MF) classification and BA classification in Junos CoS?

   • AMF classification uses a single header field, while BA classification uses multiple fields
   • BMF classification examines multiple packet fields, while BA classification uses a single header field
   • CMF classification is performed by the scheduler, while BA classification is performed by the queue
   • DMF classification is only used for MPLS traffic, while BA classification is only used for IP traffic
   Reveal Solution Discussion Select an answer first