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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 111 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 111
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A network engineer needs to provide dual-stack connectivity between a company's office location and an AWS account. The company's on-premises router supports dual-stack connectivity, and the VPC has been configured with dual-stack support. The company has set up two AWS Direct Connect connections to the office location. This connectivity must be highly available and must be reliable for latency-sensitive traffic.

Which solutions will meet these requirements? (Choose two.)

  • A. Configure a single private VIF on each Direct Connect connection. Add both IPv4 and IPv6 peering to each private VIF. Configure the on- premises equipment with the AWS provided BGP neighbors to advertise IPv4 routes on the IPv4 peering and IPv6 routes on the IPv6 peering. Enable Bidirectional Forwarding Detection (BFD) on all peering sessions.
  • B. Configure two private VIFs on each Direct Connect connection: one private VIF with the IPv4 address family and one private VIF with the IPv6 address family. Configure the on-premises equipment with the AWS provided BGP neighbors to advertise IPv4 routes on the IPv4 peering and IPv6 routes on the IPv6 peering. Enable Bidirectional Forwarding Detection (BFD) on all peering sessions.
  • C. Configure a single private VIF and IPv4 peering on each Direct Connect connection. Configure the on-premises equipment with this peering to advertise the IPv6 routes in the same BGP neighbor configuration. Enable Bidirectional Forwarding Detection (BFD) on all peering sessions.
  • D. Configure two private VIFs on each Direct Connect connection: one private VIF with the IPv4 address family and one private VIF with the IPv6 address family. Configure the on-premises equipment with the AWS provided BGP neighbors to advertise all IPv4 routes and IPv6 routes on all peering sessions. Keep the Bidirectional Forwarding Detection (BFD) configuration unchanged.
  • E. Configure two private VIFs on each Direct Connect connection: one private VIF with the IPv4 address family and one private VIF with the IPv6 address family. Configure the on-premises equipment with the AWS provided BGP neighbors to advertise IPv4 routes on the IPv4 peering and IPv6 routes on the IPv6 peering. Reduce the BGP hello timer to 5 seconds on both the on-premises equipment and the Direct Connect configuration.
Show Suggested Answer Hide Answer
Suggested Answer: AB 🗳️
by demoras at June 11, 2023, 1:49 p.m.
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norimune
Highly Voted 2 years ago
Selected Answer: AB
A&B Both ipv4 and ipv6 BGP sessions can be established with one private VIF After creating an ipv4 BGP peering on the VIF at the beginning, you can add an ipv6 peering with "add peering" And you have to enable BFD
upvoted 11 times
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AWSLoverLoverLoverLoverLover
Most Recent 2 months, 3 weeks ago
Selected Answer: AB
A & B D is incorrect because advertising all IPv4 and IPv6 routes on all peering sessions could lead to suboptimal routing.
upvoted 1 times
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Jonalb
6 months, 3 weeks ago
Selected Answer: AB
its AB
upvoted 1 times
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46f094c
7 months, 1 week ago
Selected Answer: AB
already commented
upvoted 1 times
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46f094c
7 months, 1 week ago
1.- "must be highly available and must be reliable for latency-sensitive traffic" 2.- BFD is not enabled by default. Only A, B and C mention to enable BFD. Then C is not an option to publish IPv6 over IPv4 peers, not good practice So A and B
upvoted 1 times
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cerifyme85
1 year, 2 months ago
https://aws.amazon.com/blogs/networking-and-content-delivery/dual-stack-ipv6-architectures-for-aws-and-hybrid-networks/#:~:text=AWS%20Direct%20Connect,prefixes%20or%20larger. Looks like A and B
upvoted 1 times
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vikasj1in
1 year, 4 months ago
Selected Answer: BD
B) This option provides separate VIFs for IPv4 and IPv6, allowing for distinct routing and peering sessions. BFD helps detect connectivity issues more quickly, improving reliability. D) Similar to Option B, this option provides separate VIFs for IPv4 and IPv6. It advertises all routes on all peering sessions, ensuring redundancy. Bidirectional Forwarding Detection (BFD) is optional in this case. Option A: Mixing IPv4 and IPv6 on the same peering session may not provide the desired separation of traffic. Option C: Advertising IPv6 routes on an IPv4 peering session is not a recommended practice. Option E: Reducing the BGP hello timer to 5 seconds may increase the BGP control plane traffic and could lead to unnecessary overhead. The BFD solution in Options B and D is more specific to failure detection.
upvoted 3 times
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johnconnor
1 year, 10 months ago
I also think is BD, they are asking for solutions that could work, B & D would meet the requirements. They are not asking for steps for one solution, A is not HA
upvoted 1 times
johnconnor
1 year, 10 months ago
Changing it to AB, you can achieve HA with two single connections too. https://docs.aws.amazon.com/directconnect/latest/UserGuide/high_resiliency.html
upvoted 2 times
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[Removed]
1 year, 11 months ago
Selected Answer: BD
The solutions must be HA, the question is asking for two solutions that would work, not necessarily a combination of steps, I think.
upvoted 4 times
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TravelKo
1 year, 11 months ago
Selected Answer: AB
IP4 and IP6 BGP peerings can be created using one VIF, however advertise IP4 addresses on IP4 peering and IP6 on IP6 peering .
upvoted 4 times
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norimune
2 years ago
Bは確実。 Dも正解だと思うが、BFDを有効化しないのは引っかかる。
upvoted 3 times
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demoras
2 years ago
Should it be B & D?
upvoted 4 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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