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Cisco 300-420 Exam - Topic 12 Question 112 Discussion

An engineer must design a routing solution for a company that is single-homed to an ISP. The company's goal is to run BGP between the CE and the PE devices. To support running BGP, the company obtained a public AS number and IP subnet from ARIN. Which solution must the engineer select?
C) * The ISP announces the customer public IP subnet. * The ISP announces the partial BGP table to the customer.
A) * The customer announces the public IP subnet to the ISP * The ISP announces the default route to the customer.
B) * The customer announces the public IP subnet to the ISP * The ISP announces the BGP table to the customer
D) * The customer announces the default route to the ISP * The ISP announces the default route to the customer

Cisco 300-420 Exam - Topic 12 Question 112 Discussion

Actual exam question for Cisco's 300-420 exam
Question #: 112
Topic #: 12
[All 300-420 Questions]

An engineer must design a routing solution for a company that is single-homed to an ISP. The company's goal is to run BGP between the CE and the PE devices. To support running BGP, the company obtained a public AS number and IP subnet from ARIN. Which solution must the engineer select?

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Suggested Answer: C

by Tawny at Jun 16, 2025, 11:13 PM

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Jade
8 months ago
Wait, they need a public AS number for this? Didn’t know that!
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Johana
9 months ago
D? Nah, that’s not how BGP works.
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Carri
9 months ago
I think B is better, announcing the BGP table makes more sense.
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Bambi
9 months ago
C is a bit off, why would the ISP announce the customer's subnet?
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Tuyet
9 months ago
Option A seems right, customer needs to announce their subnet.
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Fannie
9 months ago
I recall that the customer typically announces their own subnet to the ISP, so maybe option A or B could be correct, but I'm not entirely confident.
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Chun
10 months ago
I feel like I might be mixing up the roles here. Wasn't there a practice question where the ISP announced the BGP table instead?
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Leota
10 months ago
I think option A sounds familiar because it mentions the customer announcing their public IP subnet, which is something we practiced in class.
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Sage
10 months ago
I remember studying BGP configurations, but I'm not sure if the customer should announce the subnet or if the ISP does.
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Reita
10 months ago
I think the key here is that the company is single-homed, so they only need a default route from the ISP. Announcing their own public subnet and having the ISP provide the default is the most straightforward solution that meets the requirements.
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Jimmie
11 months ago
I'm a little confused by this question. What's the difference between the ISP announcing the BGP table versus just the default route? Wouldn't the customer want the full BGP table to have visibility into the internet?
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Haley
11 months ago
Okay, I've got this. The solution is option A - the customer announces their public subnet to the ISP, and the ISP announces the default route to the customer. This allows the customer to advertise their routes and get default connectivity from the ISP.
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Andra
11 months ago
Hmm, I'm a bit unsure about this one. There are a few different options, and I'm not sure which one is the correct solution. I'll need to carefully read through the details and think through the different scenarios.
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Alyce
11 months ago
This seems like a straightforward BGP configuration question. I think the key is understanding the requirements - the company has a public AS number and subnet, so they need to announce that to the ISP and have the ISP provide the default route.
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Karima
1 year ago
Haha, option D is like a game of routing hot potato. 'You take the default, no you take it!' Not very practical for a production network.
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Goldie
1 year ago
C) The ISP announces the customer public IP subnet.
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Paris
1 year ago
B) The ISP announces the BGP table to the customer
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Toi
1 year ago
A) The customer announces the public IP subnet to the ISP
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Charlena
1 year ago
I disagree, I think option C is the correct solution because the ISP should announce the customer public IP subnet.
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Jade
1 year ago
I agree with Veda, because the customer should announce the public IP subnet to the ISP.
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Veda
1 year ago
I think the engineer must select option A.
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Laquanda
1 year ago
I'm going with B. The customer announces their subnet and the ISP shares their full BGP table. That gives the customer more visibility and control over the routing.
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Portia
1 year ago
True, having the full BGP table from the ISP can definitely be beneficial for the customer.
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Billye
1 year ago
Option B does provide more visibility with the ISP sharing their full BGP table.
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Alayna
1 year ago
But wouldn't option A also work since the customer is announcing their subnet to the ISP?
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Nathalie
1 year ago
I agree, option B seems like the best choice for more control over routing.
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Cheryll
1 year ago
Option A seems like the way to go. The customer announces their public subnet and the ISP gives them the default route - simple and straightforward.
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Anika
1 year ago
Having the customer announce their public IP subnet and the ISP providing the default route just makes sense.
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Wynell
1 year ago
It definitely simplifies the routing process for the company.
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Skye
1 year ago
I agree, option A is the best choice for this scenario.
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