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Cisco 300-620 Exam - Topic 2 Question 99 Discussion

Refer to the exhibit.Refer to the exhibit. The default route is not present in the routing tables of the Cisco ACI leaf switches. All static and direct routes are currently being redistributed and advertised. Which jn must be taken to advertise a default route on the eBGP L30ut?
B) Create a Default Route Leak Policy on the L3Qut.
A) Configure a static default route on the ACI node profiles with next-hop null.
C) Enable a BGP peer prefix policy set to Always.
D) Implement an export route map matching 0.0.0.0/0.

Cisco 300-620 Exam - Topic 2 Question 99 Discussion

Actual exam question for Cisco's 300-620 exam
Question #: 99
Topic #: 2
[All 300-620 Questions]

Refer to the exhibit.

Refer to the exhibit. The default route is not present in the routing tables of the Cisco ACI leaf switches. All static and direct routes are currently being redistributed and advertised. Which jn must be taken to advertise a default route on the eBGP L30ut?

Show Suggested Answer Hide Answer
Suggested Answer: B

For external connections to the fabric that only require a default route, there is support for originating a default route for OSPF, EIGRP, and BGP L3Out connections. If a default route is received from an external peer, this route can be redistributed out to another peer following the transit export route control as described earlier in this article. A default route can also be advertised out using a Default Route Leak policy. This policy supports advertising a default route if it is present in the routing table or it always supports advertising a default route. The Default Route Leak policy is configured in the L3Out connection. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/2-x/L3_config/b_Cisco_APIC_Layer_3_Configuration_Guide/b_Cisco_APIC_Layer_3_Configuration_Guide_chapter_010100.html


by Elza at Jul 09, 2025, 02:28 AM

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Frederic
8 months ago
Wait, can you really use a null next-hop for this?
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Fanny
9 months ago
I think option B is the way to go!
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German
9 months ago
A default route is essential for proper routing.
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Kaitlyn
9 months ago
Definitely not C, that won't work here.
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Chauncey
9 months ago
I agree, B seems like the best choice!
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Lonna
9 months ago
Implementing an export route map seems familiar, but I can't remember if it was for default routes or something else.
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William
10 months ago
I feel like enabling a BGP peer prefix policy was mentioned in our notes, but I can't recall if it applies to default routes specifically.
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Lettie
10 months ago
I think we practiced a similar question where we had to create a route leak policy. Could that be the answer?
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Jenise
10 months ago
I remember discussing default routes in our study group, but I'm not sure if a static default route is the right approach here.
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Kimbery
10 months ago
This seems straightforward to me. Option D looks like the way to go - implementing an export route map to match the 0.0.0.0/0 default route and advertise it. I'll select that and move on to the next question.
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Aretha
11 months ago
I'm a bit confused by the terminology here. Can someone explain what a "Default Route Leak Policy" is and how that would work to advertise the default route? I want to make sure I understand this properly.
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Lorriane
11 months ago
Okay, I think I've got this. The key is to find the right way to inject the default route into the eBGP L3Out. I'm leaning towards option B, but I'll double-check the details.
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Wilda
11 months ago
Hmm, the default route is not present in the routing tables, so I'm guessing we need to do something to advertise it. Let me think through the choices...
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Carlene
11 months ago
This looks like a tricky networking question. I'll need to carefully review the options and think through the implications of each approach.
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Doyle
1 year ago
I'm feeling a bit 'default-y' today, so I'm going with B. Leak that default route, baby!
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Princess
1 year ago
I hope the answer isn't A, that would be like trying to plug a black hole with a default route. Yikes!
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Raylene
1 year ago
I'm torn between B and D, but I'm leaning towards B. Seems like the more elegant solution.
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Christoper
1 year ago
C is the answer, no doubt. Enabling a BGP peer prefix policy set to Always is the way to go.
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Marsha
1 year ago
D looks good to me. An export route map matching 0.0.0.0/0 should do the trick.
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Janae
1 year ago
I think the answer is B. Creating a Default Route Leak Policy on the L3Out seems like the most straightforward way to advertise a default route.
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Dahlia
12 months ago
I think enabling a BGP peer prefix policy set to Always could also work.
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Gracie
1 year ago
But what about configuring a static default route on the ACI node profiles with next-hop null?
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Fidelia
1 year ago
I agree, creating a Default Route Leak Policy on the L3Out makes sense.
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Derick
1 year ago
But wouldn't creating a Default Route Leak Policy on the L3Qut also work? That's option B.
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Pilar
1 year ago
I disagree, I believe the correct answer is D) Implement an export route map matching 0.0.0.0/0.
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Derick
1 year ago
I think the answer is A) Configure a static default route on the ACI node profiles with next-hop null.
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