Discuss Juniper JN0-683 Exam Topic 10 Question 12

Exhibit.

Referring to the exhibit, when Host A sends an ARP request for Host B's IP address, which Junos feature does leaf1 require to send an ARP response back to Host A without having to send a broadcast frame over the fabric?

Aproxy ARP

Bproxy NDP

CGARP

DDAD

Suggested Answer: A

Scenario Overview:

In the exhibit, Host A is trying to resolve Host B's IP address (10.10.1.2) through ARP (Address Resolution Protocol). Normally, an ARP request would be broadcasted over the network, and the host owning the IP address (Host B) would respond.

Role of Proxy ARP:

Option A: Proxy ARP allows a router or switch (in this case, leaf1) to respond to ARP requests on behalf of another host. Leaf1, knowing the MAC address of Host B through the EVPN MAC advertisement, can reply to Host A's ARP request directly without broadcasting the request across the entire network fabric. This feature reduces unnecessary traffic and increases network efficiency.

Conclusion:

Option A: Correct---Proxy ARP enables leaf1 to respond to Host A's ARP request for Host B's IP without broadcasting over the IP fabric, thus providing the ARP response locally.

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29 comments · newest first

Raul 11 months ago

I disagree, proxy NDP seems more relevant here.

Ines 11 months ago

Definitely proxy ARP, no doubt about it.

Brandon 11 months ago

Wait, GARP? I didn't even know that was a thing!

Lavina 11 months ago

I think it's proxy NDP, not ARP.

Patria 12 months ago

Pretty sure it's proxy ARP.

Ruthann 12 months ago

DAD sounds familiar, but I can't recall if it applies to ARP responses. I might be mixing it up with something else.

Annette 1 year ago

I practiced a similar question last week, and I believe GARP was mentioned, but I don't think it's the right answer for this scenario.

Sue 1 year ago

I'm not entirely sure, but I remember something about proxy NDP being related to IPv6. Could that be relevant here?

Luz 1 year ago

I think this might be about proxy ARP since it allows a device to respond to ARP requests on behalf of another device.

Pete 1 year ago

I'm a little confused by the wording of this question. What exactly does it mean for leaf1 to "send an ARP response back to Host A without having to send a broadcast frame over the fabric"? I'll need to think through the networking concepts involved to determine the correct Junos feature.

Janna 1 year ago

Proxy ARP seems like the most likely answer here. If leaf1 can respond to the ARP request on behalf of Host B without needing to broadcast it, that would fit the description of the question. I'll go with option A.

Jutta 1 year ago

Hmm, I'm a bit unsure about this one. I know ARP is used for address resolution, but I'm not familiar with all the Junos features mentioned. I'll have to carefully read through the options and try to reason out the best answer.

Pearly 1 year ago

This looks like a networking question related to ARP and Junos features. I'll need to think through the different options and consider how each one might work in this scenario.

Cherry 2 years ago

DAD? Is this a trick question or something? That's for duplicate address detection, not for responding to ARP requests. Haha, the exam writers are getting sneaky!

Mabelle 2 years ago

↳ replying to Cherry

Good to know, thanks for the clarification!

Tawna 2 years ago

↳ replying to Cherry

Definitely not DAD, that's for duplicate address detection.

Rhea 2 years ago

↳ replying to Cherry

Yeah, proxy ARP allows leaf1 to respond to ARP requests without broadcasting.

Ty 2 years ago

↳ replying to Cherry

I think the correct answer is proxy ARP.

Meghann 2 years ago

GARP? Really? That's for gratuitous ARP, not for responding to ARP requests. This question is a piece of cake!

Mireya 2 years ago

I think option B, proxy NDP, is the correct answer here. The question is about IPv6, not IPv4, so proxy ARP wouldn't be applicable.

Adell 2 years ago

↳ replying to Mireya

That makes sense, so proxy NDP is the best choice here.

Isadora 2 years ago

↳ replying to Mireya

I don't think so, GARP is more for updating MAC addresses in a network.

Angelyn 2 years ago

↳ replying to Mireya

But wouldn't GARP also be a valid option for this scenario?

Galen 2 years ago

↳ replying to Mireya

I agree, proxy NDP makes more sense for IPv6.

Nicholle 2 years ago

I agree with you, Marshall. Proxy ARP allows leaf1 to respond to Host A without broadcasting.

Marshall 2 years ago

I think the answer is A) proxy ARP.

Luann 2 years ago

Proxy ARP, definitely! That's the Junos feature that allows the leaf switch to respond to the ARP request without flooding the fabric.

Alyce 2 years ago

↳ replying to Luann

Definitely, it helps avoid flooding the fabric with broadcast frames.

Selma 2 years ago

↳ replying to Luann

Proxy ARP is the way to go in this scenario.

Juniper JN0-683 Exam - Topic 10 Question 12 Discussion