Juniper JN0-105 Exam - Topic 4 Question 35 Discussion

Actual exam question for Juniper's JN0-105 exam

Question #: 35
Topic #: 4

[All JN0-105 Questions]

Which two statements are true about the PFE? (Choose two.)

AThe PFE implements various services such as policing, stateless firewall filtering, and class of service.

BThe PFE uses Layer 2 and Layer 3 forwarding tables to forward traffic toward its destination.

CThe PFE handles all processes that control the chassis components.

DThe PFE is responsible for performing protocol updates and system management.

Show Suggested Answer

Suggested Answer: A, B

The Packet Forwarding Engine (PFE) in Juniper Networks devices is the heart of the data plane, handling the actual forwarding of packets based on pre-computed forwarding tables. It provides several critical services to manage and control traffic flow, including policing (to enforce bandwidth limits for certain traffic types), stateless firewall filtering (to permit or deny traffic based on predefined criteria), and Class of Service (CoS) (to prioritize traffic to ensure quality of service for critical applications). The PFE utilizes both Layer 2 (MAC addresses) and Layer 3 (IP addresses) forwarding tables to make intelligent forwarding decisions, ensuring that packets are efficiently routed toward their final destination.

by Ressie at May 06, 2025, 12:31 AM

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Krissy

2 months ago

Wait, the PFE does all that? Surprising!

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Elvera

2 months ago

I think C is also correct, but not sure about D.

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Dominga

3 months ago

I disagree, D seems off to me.

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Amie

3 months ago

A and C are spot on!

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Gail

3 months ago

A and B are definitely true!

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Izetta

3 months ago

I have a vague memory of option D being discussed in class, but I can't remember if it was specifically about protocol updates.

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Paris

4 months ago

I'm a bit confused about option C; I thought the PFE was more about forwarding rather than controlling chassis components.

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Marjory

4 months ago

I recall a practice question that mentioned Layer 2 and Layer 3 forwarding tables, so I feel confident about option B being true.

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Cecil

4 months ago

I think option A sounds familiar because I remember studying about the services the PFE provides, but I'm not entirely sure if it's the right choice.

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Cruz

4 months ago

I'm pretty confident A and B are correct, the PFE is responsible for the forwarding plane and services like policing and filtering. C and D seem a bit more ambiguous, I'm not sure if the PFE handles chassis components or protocol updates, so I'll have to be more cautious with those.

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Tanja

4 months ago

Okay, let me think this through. A and B sound right, the PFE does the Layer 2 and 3 forwarding. C and D seem a bit more questionable, I'm not sure if the PFE handles chassis components or protocol updates. I'll have to review those.

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Caprice

5 months ago

Hmm, I'm a bit unsure about C and D. I know the PFE is responsible for forwarding, but I'm not sure if it handles chassis components or protocol updates. I'll have to think about those.

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Zona

5 months ago

I'm pretty confident about this one. The PFE handles forwarding and services like policing and firewall filtering, so A and B are definitely true.

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Leanora

9 months ago

I think D is not true, as the PFE is not responsible for protocol updates.

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Crista

9 months ago

D is a bit of a stretch, the PFE is more about the hardware and data plane, not the control plane. I'd go with B and C.

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Willow

8 months ago

Definitely, the PFE uses Layer 2 and Layer 3 forwarding tables and handles chassis components.

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Willow

8 months ago

I agree, B and C are the correct statements about the PFE.

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Deeanna

8 months ago

Yeah, D is definitely not true. B and C make more sense for the PFE.

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Deeanna

8 months ago

I agree, B and C are the correct statements about the PFE.

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Peggie

9 months ago

I believe C is also true because the PFE handles chassis components.

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Lavonne

9 months ago

I agree with Emiko, the PFE does implement various services and uses forwarding tables.

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Viola

9 months ago

Haha, the PFE is like the brain and brawn of the network device, handling everything from traffic to chassis control. I'm going with B and C.

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Keneth

8 months ago

Temeka: So, B and C are the correct statements about the PFE.

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Temeka

8 months ago

User 2: Yeah, that's true. It also handles processes that control the chassis components.

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Anglea

8 months ago

User 1: I think the PFE is responsible for forwarding traffic using Layer 2 and Layer 3 tables.

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Francine

9 months ago

I think A and B are the right choices. The PFE handles packet forwarding and various services like policing and QoS.

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Eladia

8 months ago

User 4: No, that responsibility lies with other components in the system.

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Novella

8 months ago

User 3: So, the PFE doesn't handle all processes that control the chassis components?

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Reta

9 months ago

User 2: I agree, the PFE implements services like policing and uses Layer 2 and Layer 3 forwarding tables.

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Margret

9 months ago

User 1: I think A and B are correct. The PFE handles packet forwarding and various services like policing and QoS.

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Emiko

10 months ago

I think A and B are true about the PFE.

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Lajuana

10 months ago

B and C seem to be the correct answers. The PFE is responsible for forwarding and chassis control, but not protocol updates.

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Vallie

9 months ago

C) The PFE handles all processes that control the chassis components.

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Luz

9 months ago

B) The PFE uses Layer 2 and Layer 3 forwarding tables to forward traffic toward its destination.

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Huey

9 months ago

A) The PFE implements various services such as policing, stateless firewall filtering, and class of service.

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