Juniper JN0-281 Exam - Topic 2 Question 6 Discussion

Actual exam question for Juniper's JN0-281 exam

Question #: 6
Topic #: 2

[All JN0-281 Questions]

Which statement is correct about aggregate routes?

AThe default next hop is discard.

BThe default next hop is readvertise.

CThe default next hop is resolve.

DThe default next hop is reject.

Show Suggested Answer

Suggested Answer: D

An aggregate route is a summarized route that is created by combining multiple specific routes into a single, broader route. In Junos OS, when an aggregate route is configured, its default next hop is set to reject.

Step-by-Step Explanation:

Aggregate Route:

Aggregate routes are used to reduce the size of routing tables by representing a collection of more specific routes with a single summary route. They help improve routing efficiency and scalability, especially in large networks.

Default Next Hop Behavior:

When you configure an aggregate route in Junos OS, it has a reject next hop by default.

The reject next hop means that if a packet matches the aggregate route but there is no more specific route in the routing table for that destination, the packet will be discarded, and an ICMP 'destination unreachable' message is sent to the source.

This behavior helps to prevent routing loops and ensures that traffic isn't forwarded to destinations for which there is no valid route.

Modifying Next Hop:

If needed, the next hop behavior of an aggregate route can be changed to discard (which silently drops the packet) or to another specific next hop. However, by default, the next hop is set to reject.

Juniper Reference:

Junos Command: set routing-options aggregate route <route> reject to configure an aggregate route with a reject next hop.

Verification: Use show route to verify the presence and behavior of aggregate routes.

by Ira at Apr 06, 2025, 08:44 PM

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Brunilda

4 months ago

No way, I thought it was readvertise!

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Wendell

4 months ago

Wait, is it really discard? I thought it was something else.

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Carin

4 months ago

I remember learning that A is correct.

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Paulina

4 months ago

Totally agree, A is the right answer!

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Selma

5 months ago

The default next hop is discard.

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Shenika

5 months ago

I vaguely remember that the default next hop is discard, but I also feel like I saw a question about readvertise somewhere. This is tricky!

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Naomi

5 months ago

I thought the default next hop was reject, but I might be mixing it up with another topic we covered.

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Gilberto

5 months ago

I remember discussing aggregate routes, but I can't recall if the next hop is readvertise or reject. I need to double-check my notes.

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Zona

6 months ago

I think the default next hop for aggregate routes is discard, but I'm not entirely sure. It feels like I saw something about that in our last practice session.

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Shawana

6 months ago

Aggregate routes can be tricky, but I think the default next hop being reject makes the most sense. I'll select option D.

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Nickolas

6 months ago

The default next hop being discard sounds right to me, so I'll go with option A.

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Tonette

6 months ago

Hmm, I'm a bit unsure about this one. I'll have to think it through carefully before selecting an answer.

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Carla

6 months ago

I'm pretty sure the default next hop for aggregate routes is to resolve, so I'll go with option C.

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Alpha

11 months ago

This question is a real head-scratcher! I bet the exam writer was in a mood to 'reject' all the wrong answers. ;)

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Latia

9 months ago

I think the correct answer is C) The default next hop is resolve.

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Casie

9 months ago

C) The default next hop is resolve.

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Mammie

10 months ago

A) The default next hop is discard.

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Marshall

11 months ago

Wait, wasn't the default next hop for aggregate routes 'discard'? I'm going with A on this one.

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Kassandra

11 months ago

Hmm, this is a tricky one. I'm going to go with B. 'Readvertise' sounds like the correct default next hop for aggregate routes.

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Shawana

9 months ago

User 4: I think it might be discard, actually.

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Caprice

10 months ago

User 3: I'm going with B. 'Readvertise' sounds correct.

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Cristy

10 months ago

User 2: I'm not sure, but I believe it's reject.

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Javier

10 months ago

User 1: I think the default next hop for aggregate routes is resolve.

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Arthur

11 months ago

I think it's D. The default next hop should be 'reject' to avoid forwarding traffic to non-existent networks.

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Chauncey

10 months ago

Oh, I see. Thanks for clarifying!

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Abraham

10 months ago

Actually, the correct answer is A) The default next hop is discard.

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Jutta

11 months ago

I think it's D. The default next hop should be 'reject' to avoid forwarding traffic to non-existent networks.

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Gearldine

12 months ago

I'm pretty sure the correct answer is C. The default next hop for aggregate routes is 'resolve'.

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William

11 months ago

No problem, happy to help!

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Isabelle

11 months ago

That makes sense, thanks for clarifying.

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Viki

11 months ago

So, the correct answer is C) The default next hop is resolve.

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Glen

11 months ago

I think you're right, the default next hop for aggregate routes is 'resolve'.

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Leonardo

12 months ago

I'm not sure, but I think D) The default next hop is reject could also be a correct statement depending on the specific configuration.

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Lisbeth

12 months ago

I agree with Becky, because when we use aggregate routes, the default next hop is usually resolve to find the best path.

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Becky

1 year ago

I think the correct statement is C) The default next hop is resolve.

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