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Juniper JN0-351 Exam - Topic 9 Question 45 Discussion

Which statement is correct about graceful Routing Engine switchover (GRES)?
C) When combined with NSR, routing is preserved and the new master RE does not restart rpd.
A) The PFE restarts and the kernel and interface information is lost.
B) GRES has a helper mode and a restarting mode.
D) With no other high availability features enabled, routing is preserved and the new master RE does not restart rpd.

Juniper JN0-351 Exam - Topic 9 Question 45 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 45
Topic #: 9
[All JN0-351 Questions]

Which statement is correct about graceful Routing Engine switchover (GRES)?

Show Suggested Answer Hide Answer
Suggested Answer: C

The Graceful Routing Engine Switchover (GRES) feature in Junos OS enables a router with redundant Routing Engines to continue forwarding packets, even if one Routing Engine fails1.GRES preserves interface and kernel information, ensuring that traffic is not interrupted1.However, GRES does not preserve the control plane1.

To preserve routing during a switchover, GRES must be combined with either Graceful Restart protocol extensions or Nonstop Active Routing (NSR)1.When GRES is combined with NSR, nearly 75 percent of line rate worth of traffic per Packet Forwarding Engine remains uninterrupted during GRES1.Any updates to the primary Routing Engine are replicated to the backup Routing Engine as soon as they occur1.

Therefore, when GRES is combined with NSR, routing is preserved and the new master RE does not restart rpd1.


by Veronica at Jul 11, 2025, 11:47 AM

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Cordelia
7 months ago
B is definitely correct, I've seen it in action.
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Ruthann
7 months ago
D sounds off to me, isn't that risky?
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Miesha
7 months ago
I think C is the right answer.
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Tiffiny
7 months ago
Wait, so the new master RE doesn't restart rpd? That's surprising!
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Rory
7 months ago
GRES does have a helper mode!
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Quiana
8 months ago
I practiced a question similar to this, and I think option D might be the right choice since it talks about routing preservation without other features.
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Mari
8 months ago
I feel like option C is correct because it mentions NSR, but I’m not entirely confident about the details.
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Kattie
8 months ago
I remember something about helper mode and restarting mode, but I can't recall which statement that relates to.
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Noel
8 months ago
I think GRES is supposed to preserve routing, but I'm not sure if it applies when no other features are enabled.
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Princess
9 months ago
This is a good test of my knowledge on Junos high availability concepts. I'll carefully consider each option and eliminate the ones that don't align with my understanding of GRES.
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Emelda
9 months ago
I'm pretty confident in my understanding of GRES. I believe the correct answer is option C, which describes the behavior when GRES is combined with NSR.
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Carissa
9 months ago
Okay, I think I've got this. The key is understanding how GRES interacts with other high availability features like NSR. Let me think this through carefully.
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Detra
9 months ago
Hmm, I'm a bit confused by the options. I'll need to review my notes on GRES and high availability features to determine the correct statement.
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Celeste
9 months ago
This question seems straightforward, but I want to make sure I understand the details of GRES before selecting an answer.
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Toi
11 months ago
I'm torn between B and C, but I think C is the winner. Routing preserved and no rpd restart? Sign me up! Although, I wonder if the new master RE can also do the robot dance...
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Eva
11 months ago
D could be correct too, but C seems more specific about preserving routing.
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Huey
11 months ago
I'm not sure, but I think D could also be correct.
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Kristian
11 months ago
D is the way to go! Routing is preserved and the new master RE doesn't restart rpd, even without any other high availability features. Efficiency at its finest!
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Lucina
10 months ago
User 2: I agree, it's great that routing is maintained without any other high availability features.
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Johnna
10 months ago
User 1: D is definitely the best option. Routing is preserved and the new master RE doesn't restart rpd.
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Annett
11 months ago
I agree with Eva, C makes sense because NSR helps preserve routing.
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Eva
11 months ago
I think the correct statement is C.
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Lizbeth
12 months ago
I'm going with B. GRES has a helper mode and a restarting mode, which makes sense for graceful switchover. Seems like a solid choice to me.
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Dexter
11 months ago
User 2: Yeah, I agree. Having both helper mode and restarting mode gives more flexibility in handling the switchover process.
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Elza
11 months ago
User 1: I'm going with B. GRES has a helper mode and a restarting mode, which makes sense for graceful switchover. Seems like a solid choice to me.
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Lucia
1 year ago
Option C seems to be the correct answer. It mentions that with NSR, routing is preserved and the new master RE doesn't restart rpd. Gotta love that high availability!
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Nelida
12 months ago
That's great for high availability, no need to restart rpd with the new master RE.
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Tracey
12 months ago
Yes, option C mentions that routing is preserved with NSR.
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Dyan
12 months ago
I think option C is the correct answer.
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