Class of Service (CoS) JN0-105 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A network administrator is configuring CoS on a Junos device to prioritize mission-critical application traffic over standard web browsing. The administrator has already created a forwarding class called 'critical' and assigned the application traffic to it using a firewall filter. What must the administrator do next to ensure that the 'critical' traffic receives preferential treatment?

   • AEnable weighted random early detection (WRED) on the 'critical' forwarding class.
   • BApply a scheduler to the 'critical' forwarding class that guarantees a higher transmit rate and a lower drop priority.
   • CCreate a new forwarding class for web browsing and assign it a lower priority.
   • DConfigure a rewrite rule to mark the 'critical' traffic with a higher DSCP value.
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2. 7expert · hard

   A network engineer is troubleshooting a CoS issue on a Junos router. The engineer has configured a scheduler map that assigns a strict-priority scheduler to the 'voice' queue. However, when monitoring the queue statistics, the engineer notices that the 'voice' queue is not being serviced with priority. What is the most likely cause?

   • AThe rewrite rule is not configured on the egress interface.
   • BThe scheduler map is not applied to the egress interface.
   • CThe classifier is not applied to the ingress interface.
   • DThe forwarding class 'voice' is not mapped to a queue.
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4. 8foundation · easy

   Which Junos operational command displays queue statistics for an interface?

   • Ashow class-of-service interface
   • Bshow interfaces queue
   • Cshow queue statistics
   • Dshow class-of-service scheduler
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5. 9foundation · easy

   What is the function of a scheduler in Junos CoS?

   • ATo modify the DSCP or 802.1p bits on egress packets
   • BTo determine how packets in each queue are transmitted, including priority and bandwidth
   • CTo examine incoming packets and assign them to a forwarding class
   • DTo store packets that are waiting to be transmitted
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6. 10application · medium

   An enterprise is deploying a new Junos router and wants to implement CoS to ensure that VoIP traffic is forwarded with low latency. The administrator has already configured a forwarding class named 'voip' and assigned it to queue 5. Which configuration step is required to complete the basic CoS setup?

   • AEnable the 'voip' forwarding class on the default scheduler map.
   • BApply a scheduler map to the interface that references a scheduler for the 'voip' forwarding class.
   • CConfigure a firewall filter to reclassify all traffic into the 'voip' forwarding class.
   • DCreate a rewrite rule that maps the 'voip' forwarding class to a specific DSCP value.
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