CoS Processing on Junos Devices JN0-650 Practice Questions (Page 3)

Questions 11–15

1. 11application · easy

   A Junos device receives traffic that is not matched by any configured classifier. The network administrator wants to ensure this traffic is placed into the best-effort (BE) forwarding class. What is the default behavior and what configuration, if any, is needed?

   • AThe traffic is assigned to the expedited-forwarding forwarding class by default; a classifier must be configured to change it to BE
   • BThe fixed classifier assigns all unmatched traffic to the BE forwarding class by default; no additional configuration is needed
   • CThe traffic is dropped by default; a classifier must be configured to assign it to the BE forwarding class
   • DThe traffic is assigned to the network-control forwarding class by default; a classifier must be configured to change it to BE
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2. 12foundation · easy

   Which forwarding class is typically assigned by the default fixed classifier on Junos devices?

   • ANetwork-control
   • BExpedited-forwarding
   • CBest-effort
   • DAssured-forwarding
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4. 13application · medium

   A service provider is deploying a new CoS architecture on their Junos edge routers. They need to ensure that voice traffic receives the lowest latency and jitter, while bulk data traffic should not starve other classes. They plan to use a single physical interface for all traffic. Which two CoS components must be configured together to achieve this goal?

   • AA scheduler map with strict-priority queue for voice and a weighted round-robin (WRR) queue for bulk data, applied to the interface
   • BA single scheduler with equal priority for all queues, applied to the interface
   • CA rewrite rule for voice and a classifier for bulk data, applied to the interface
   • DA policer on the voice queue and a shaper on the bulk data queue, applied to the interface
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5. 14foundation · easy

   What does a behavioral aggregate (BA) classifier use to assign a forwarding class and loss priority to a packet?

   • AA single field in the packet header, such as DSCP or 802.1p
   • BMultiple fields in the packet header, such as source and destination IP
   • CThe source MAC address and ingress interface
   • DThe output queue length and current congestion level
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6. 15expert · hard

   A network engineer is configuring CoS on a Junos router that receives traffic from multiple customers. Each customer's traffic is marked with different DSCP values. The engineer wants to ensure that all traffic from a specific customer is treated as best-effort, regardless of DSCP markings, while other customers' traffic is classified based on DSCP. Which configuration should be used?

   • AApply a rewrite rule to the specific customer's ingress interface that sets DSCP to BE
   • BApply a multifield classifier to the specific customer's ingress interface that matches the customer's source IP and sets forwarding class BE
   • CApply a fixed classifier to the specific customer's ingress interface
   • DApply a BA classifier to the specific customer's ingress interface that maps all DSCP values to BE
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