A network engineer is designing CoS for a Junos router that connects a customer site to a service provider. The customer has a contract that allows a committed information rate (CIR) of 50 Mbps and a peak information rate (PIR) of 100 Mbps. The engineer needs to ensure that traffic exceeding the CIR is marked with a higher loss priority, but not dropped, and that the total traffic does not exceed the PIR. Which configuration should be used?

Configure a policer with two rates: CIR 50 Mbps and PIR 100 Mbps, and set the loss priority to high for traffic exceeding CIR

Configure a shaper with a rate of 50 Mbps and a burst size that allows up to 100 Mbps

Configure a scheduler with a transmit-rate of 50 Mbps and a buffer-size that allows bursts up to 100 Mbps

Configure a single-rate policer with a rate of 100 Mbps and set the loss priority to high for all traffic

A network engineer is configuring CoS on a Junos router. They have four forwarding classes: expedited-forwarding (EF), assured-forwarding (AF), best-effort (BE), and network-control (NC). They want to ensure that EF traffic is transmitted before any other traffic, but they also want to guarantee a minimum bandwidth for BE traffic. Which scheduler configuration should they use?

Configure EF with strict-priority and BE with a transmit-rate guarantee

Configure EF with a high transmit-rate and BE with a low transmit-rate

Configure EF with a low drop-profile and BE with a high drop-profile

Configure EF with a high buffer-size and BE with a low buffer-size

What is the primary difference between policing and shaping in Junos CoS?

Policing uses queues, while shaping uses firewall filters

Policing buffers traffic, while shaping drops traffic

Policing drops or marks traffic that exceeds a rate, while shaping buffers excess traffic to smooth bursts

Policing is applied on egress, while shaping is applied on ingress

A network engineer is configuring CoS on a Junos router. They want to ensure that traffic exceeding a certain rate is marked with a higher loss priority, but not dropped. Which mechanism should they use?

Scheduling with a transmit-rate that limits traffic

Classification with a BA classifier that marks traffic

Shaping with a rate that buffers excess traffic

Policing with a two-rate policer that marks excess traffic with high loss priority

Juniper NetworksCertified Professional, Enterprise Routing and Switching (JNCIP-ENT)

Domain 7Objective 1

CoS Processing on Junos Devices JN0-650 Practice Questions (Page 2)

Part of the Class of Service (CoS) domain, which makes up ~10% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~4–6 in this domain), expect 1–1 from this objective — we provide 26 practice questions to prepare you well beyond it. (estimate)

26questions here

6free pages

8concepts

Questions 6–10

6expert · hard
A network engineer is designing CoS for a Junos router that connects a customer site to a service provider. The customer has a contract that allows a committed information rate (CIR) of 50 Mbps and a peak information rate (PIR) of 100 Mbps. The engineer needs to ensure that traffic exceeding the CIR is marked with a higher loss priority, but not dropped, and that the total traffic does not exceed the PIR. Which configuration should be used?
Select an answer first
7application · medium
A network engineer is configuring CoS on a Junos router. They have four forwarding classes: expedited-forwarding (EF), assured-forwarding (AF), best-effort (BE), and network-control (NC). They want to ensure that EF traffic is transmitted before any other traffic, but they also want to guarantee a minimum bandwidth for BE traffic. Which scheduler configuration should they use?
Select an answer first
8foundation · easy
What is the primary difference between policing and shaping in Junos CoS?
Select an answer first
9application · medium
A network engineer is configuring CoS on a Junos router. They want to ensure that traffic exceeding a certain rate is marked with a higher loss priority, but not dropped. Which mechanism should they use?
Select an answer first
10application · easy
A network engineer needs to limit the rate of traffic on a Junos interface to 10 Mbps. They want to allow bursts of traffic up to 15 Mbps for short periods, but they do not want to buffer excess traffic. Which CoS mechanism should they use?
Select an answer first

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CoS Processing on Junos Devices JN0-650 Practice Questions (Page 2)

Questions 6–10

What is the primary difference between policing and shaping in Junos CoS?

A network engineer is configuring CoS on a Junos router. They want to ensure that traffic exceeding a certain rate is marked with a higher loss priority, but not dropped. Which mechanism should they use?

A network engineer needs to limit the rate of traffic on a Junos interface to 10 Mbps. They want to allow bursts of traffic up to 15 Mbps for short periods, but they do not want to buffer excess traffic. Which CoS mechanism should they use?

Keep studying — Class of Service (CoS)