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Cisco 300-620 Exam - Topic 3 Question 115 Discussion

When does the Cisco ACI leaf learn a source IP or MAC as a remote endpoint?
D) When VXLAN traffic arrives on a leaf fabric port from the spine and inner source IP is in the bridge domain subnets range.
A) When VXLAN traffic arrives on a leaf fabric port from the spine and outer source IP is in the Layer 3 Out EPG subnet range.
B) When VXLAN traffic arrives on a leaf fabric port from the spine and outer source IP is in the bridge domain subnets range.
C) When VXLAN traffic arrives on a leaf fabric port from the spine and inner source IP is in the Layer 3 Out EPG subnet range.

Cisco 300-620 Exam - Topic 3 Question 115 Discussion

Actual exam question for Cisco's 300-620 exam
Question #: 115
Topic #: 3
[All 300-620 Questions]

When does the Cisco ACI leaf learn a source IP or MAC as a remote endpoint?

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Suggested Answer: D

In Cisco ACI, a leaf switch learns a source IP or MAC as a remote endpoint when VXLAN traffic arrives on a leaf fabric port from the spine, and the inner source IP is within the range of the bridge domain subnets associated with the leaf. This process is part of the ACI's COOP (Council Of Oracles Protocol), which ensures that endpoint information is accurately disseminated across the fabric for efficient traffic forwarding.


by Son at Jul 01, 2026, 03:48 AM

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Royal
3 days ago
I lean towards C. Inner source IP is important too.
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Lizette
8 days ago
B is more accurate. Bridge domain is where it starts.
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Chan
13 days ago
A feels right. The outer source IP is key.
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Ilene
18 days ago
I prefer B. Bridge domain subnets are crucial here.
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Marg
24 days ago
I think it's A. It makes sense with Layer 3 Out EPG.
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Luisa
29 days ago
I disagree, I think it’s C. The inner IP is key here.
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Elroy
1 month ago
Wait, so it doesn't learn from the Layer 3 Out? That’s surprising!
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Tamala
1 month ago
Definitely B! Makes sense for bridge domains.
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Roselle
1 month ago
I thought it was A, but now I'm not so sure.
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Cortney
2 months ago
It's B, right? That's when it learns the MAC!
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Kris
2 months ago
I thought it was option A because it specifically mentions the Layer 3 Out EPG, but I could be mixing it up with another topic we covered.
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Cherri
2 months ago
I'm a bit confused about the inner and outer IPs here. I feel like it could be option D since it mentions the bridge domain, but I need to double-check my notes.
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Lenny
2 months ago
I remember practicing a question similar to this, and I think it was about the bridge domain subnets. So maybe it's option B?
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Leigha
2 months ago
I think the leaf learns the source IP when the outer source IP is in the Layer 3 Out EPG subnet range, but I'm not entirely sure if that's A or B.
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