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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.)

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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
4 months ago
Wait, the PFE does all that? Surprising!
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Elvera
4 months ago
I think C is also correct, but not sure about D.
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Dominga
4 months ago
I disagree, D seems off to me.
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Amie
4 months ago
A and C are spot on!
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Gail
5 months ago
A and B are definitely true!
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Izetta
5 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
5 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
5 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
6 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
6 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
6 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
6 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
6 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
10 months ago
I think D is not true, as the PFE is not responsible for protocol updates.
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Crista
10 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
9 months ago
Definitely, the PFE uses Layer 2 and Layer 3 forwarding tables and handles chassis components.
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Willow
9 months ago
I agree, B and C are the correct statements about the PFE.
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Deeanna
10 months ago
Yeah, D is definitely not true. B and C make more sense for the PFE.
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Deeanna
10 months ago
I agree, B and C are the correct statements about the PFE.
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Peggie
10 months ago
I believe C is also true because the PFE handles chassis components.
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Lavonne
11 months ago
I agree with Emiko, the PFE does implement various services and uses forwarding tables.
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Viola
11 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
9 months ago
Temeka: So, B and C are the correct statements about the PFE.
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Temeka
9 months ago
User 2: Yeah, that's true. It also handles processes that control the chassis components.
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Anglea
10 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
11 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
9 months ago
User 4: No, that responsibility lies with other components in the system.
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Novella
9 months ago
User 3: So, the PFE doesn't handle all processes that control the chassis components?
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Reta
10 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
10 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
11 months ago
I think A and B are true about the PFE.
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Lajuana
11 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
10 months ago
C) The PFE handles all processes that control the chassis components.
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Luz
10 months ago
B) The PFE uses Layer 2 and Layer 3 forwarding tables to forward traffic toward its destination.
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Huey
11 months ago
A) The PFE implements various services such as policing, stateless firewall filtering, and class of service.
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