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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 13 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 13
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company has two on-premises data center locations. There is a company-managed router at each data center. Each data center has a dedicated AWS Direct Connect connection to a Direct Connect gateway through a private virtual interface. The router for the first location is advertising 110 routes to the Direct Connect gateway by using BGP, and the router for the second location is advertising 60 routes to the Direct Connect gateway by using BGP. The Direct Connect gateway is attached to a company VPC through a virtual private gateway.
A network engineer receives reports that resources in the VPC are not reachable from various locations in either data center. The network engineer checks the VPC route table and sees that the routes from the first data center location are not being populated into the route table. The network engineer must resolve this issue in the most operationally efficient manner.
What should the network engineer do to meet these requirements?

  • A. Remove the Direct Connect gateway, and create a new private virtual interface from each company router to the virtual private gateway of the VPC.
  • B. Change the router configurations to summarize the advertised routes.
  • C. Open a support ticket to increase the quota on advertised routes to the VPC route table.
  • D. Create an AWS Transit Gateway. Attach the transit gateway to the VPC, and connect the Direct Connect gateway to the transit gateway.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by zaazanuna at March 18, 2023, 6:22 p.m.
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study_aws1
Highly Voted 1 year, 10 months ago
Option B) - You can announce a maximum of 100 prefixes to AWS.These routes can be automatically be propagated into subnet route tables • In order to advertise more than 100 prefixes, you should summarize the prefixes into larger range to reduce number of prefixes
upvoted 12 times
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emmanuelodenyire
Highly Voted 1 year, 9 months ago
Selected Answer: B
The correct answer to this question is option B: Change the router configurations to summarize the advertised routes. Here's why: The issue described in the question is that the VPC route table is not receiving all of the advertised routes from the on-premises routers. The router at the first location is advertising 110 routes, but those routes are n
upvoted 8 times
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Akivox
Most Recent 4 months, 1 week ago
Selected Answer: B
B: Customer needs to summarise the routes and advertise. Not D, because a transit gateway requires a transit VIF, this point doesn't mention about transit VIF.
upvoted 1 times
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acloudguru
8 months, 1 week ago
Selected Answer: D
Operational Overhead: Implementing and maintaining route summarization configurations can introduce additional operational overhead and complexity, especially in dynamic environments where network changes are frequent.
upvoted 1 times
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Raphaello
9 months, 4 weeks ago
Selected Answer: B
Correct answer is B. Private VIF accept up to 100 prefixes. Need to summarize (merge) some advertised prefixes to lower those 110.
upvoted 1 times
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skjb
10 months ago
The correct answer to this question is option B
upvoted 1 times
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patanjali
10 months, 3 weeks ago
Selected Answer: B
Yes, there is a limit of 100 routes limit via Direct Connect with transit vif or privat vif (https://docs.aws.amazon.com/directconnect/latest/UserGuide/limits.html), if your route advertise more than that, the BGP session will go idle (DOWN). You can do a route summarization if you can or consider using Transit Gateway Connect to build a overlay GRE tunnel with BGP session to advertise your routing information.
upvoted 1 times
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WherecanIstart
11 months ago
Selected Answer: B
Route summarization is the most efficient way for this circumstances.
upvoted 1 times
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vikasj1in
11 months, 2 weeks ago
Selected Answer: B
The issue appears to be related to the number of routes advertised from each data center location. AWS Direct Connect has a limit on the number of routes that can be advertised to a virtual private gateway in a VPC (100 routes by default). In this case, the router for the first data center is advertising 110 routes, which exceeds the default limit, leading to the routes not being populated into the VPC route table. To resolve this issue in the most operationally efficient manner, the network engineer should consider summarizing the advertised routes. Summarizing routes involves aggregating a set of routes into a single, more general route. In BGP, this is typically done using route summarization. By changing the router configurations to summarize the advertised routes, the network engineer can reduce the number of routes being advertised to the Direct Connect gateway, ensuring that it stays within the route limit imposed by AWS.
upvoted 4 times
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Marfee400704
11 months, 2 weeks ago
I think that it's correct answer is B according to SPOTO products.
upvoted 1 times
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marfee
11 months, 3 weeks ago
I think that it's correcty answer is B.
upvoted 1 times
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nuzz
1 year, 1 month ago
Pick B because D is wrong. Q: Can I associate my AWS Transit Gateway to the AWS Direct Connect gateway attached to a private virtual interface? No, an AWS Transit Gateway can only be associated with the AWS Direct Connect gateway attached to transit virtual interface. https://aws.amazon.com/directconnect/faqs
upvoted 2 times
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yanhiro
1 year, 1 month ago
Selected Answer: B
Option B) See this link (https://repost.aws/questions/QURPt7zKeWSr6-JvM5YQSgvA/aws-direct-connect-route-limit)
upvoted 1 times
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FayeG
1 year, 2 months ago
Selected Answer: B
aggreation is the correct answer
upvoted 1 times
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Z_o_r_o
1 year, 3 months ago
Selected Answer: D
It seems D is the answer because of the following observation: A network engineer receives reports that resources in the VPC are not reachable from various locations in either data center.
upvoted 1 times
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DEN_ZZ
1 year, 3 months ago
Selected Answer: D
Both B and D correct, but D more likely is right answer because we don't know what 110 routes are, and is it possible to summarize them. As for D everything is correct, because up to 1000 prefixes can be advertised through Transit Gateway https://aws.amazon.com/ru/blogs/networking-and-content-delivery/using-aws-transit-gateway-connect-to-extend-vrfs-and-increase-ip-prefix-advertisement/
upvoted 1 times
luisgu
5 months ago
Transit VIF also has a hard limit of 100 BGP advertised routes; the link you posted refers to transit gateway connect attachment, which does not apply to this scenario
upvoted 1 times
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sadovenk0
1 year, 2 months ago
but it wasn't mentioned that u'll switch private virtual interface to a transit one so it shouldn't work
upvoted 1 times
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WMF0187
1 year, 4 months ago
I at 1st picked B but I can see how D is the answer...the question does ask The router for the first location is advertising 110 routes to the Direct Connect gateway by using BGP, and the router for the second location is advertising 60 routes to the Direct Connect gateway by using BGP ... The network engineer must resolve this issue in the most operationally efficient manner however, that partially the problem here as we have to focus and NOT assume that the architecture is complete since a TGW is need to propagate routes from/to a DXConnection and can support up to 1000 routes. Reading comprehension is fundemental
upvoted 1 times
[Removed]
1 year, 3 months ago
In the context of the network engineer's task mentioned earlier, resolving the issue in the most operationally efficient manner means finding the quickest and most effective way to solve the problem without unnecessary complexity, downtime, or resource consumption. It involves identifying and implementing solutions that efficiently address the issue without causing additional operational challenges or disruptions.
upvoted 2 times
[Removed]
1 year, 3 months ago
Hence B
upvoted 2 times
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