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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 123 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 123
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company deploys a software solution on Amazon EC2 instances that are in a cluster placement group. The solution's UI is a single HTML page. The HTML file size is 1,024 bytes. The software processes files that exceed 1,024 MB in size. The software shares files over the network to clients upon request. The files are shared with the Don't Fragment flag set. Elastic network interfaces of the EC2 instances are set up with jumbo frames.

The UI is always accessible from all allowed source IP addresses, regardless of whether the source IP addresses are within a VPC, on the internet, or on premises. However, clients sometimes do not receive files that they request because the files fail to travel successfully from the software to the clients.

Which options provide a possible root cause of these failures? (Choose two.)

  • A. The source IP addresses are from on-premises hosts that are routed over AWS Direct Connect.
  • B. The source IP addresses are from on-premises hosts that are routed over AWS Site-to-Site VPN.
  • C. The source IP addresses are from hosts that connect over the public internet.
  • D. The security group of the EC2 instances does not allow ICMP traffic.
  • E. The operating system of the EC2 instances does not support jumbo frames.
Show Suggested Answer Hide Answer
Suggested Answer: BC 🗳️
by AJ7428 at June 12, 2023, 9:39 p.m.
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albertkr
Highly Voted 1 year, 7 months ago
Selected Answer: BC
Jumbo frames allow more than 1500 bytes of data by increasing the payload size per packet, and thus increasing the percentage of the packet that is not packet overhead. Fewer packets are needed to send the same amount of usable data. However, traffic is limited to a maximum MTU of 1500 in the following cases: Traffic over an internet gateway Traffic over an inter-region VPC peering connection Traffic over VPN connections Traffic outside of a given AWS Region for EC2-Classic If packets are over 1500 bytes, they are fragmented, or they are dropped if the Don't Fragment flag is set in the IP header. regardless the security group allows icmp traffic to enable pmtud or not, the oversized packets will be dropped anyway due to don't fragment flag set.
upvoted 6 times
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JosMo
Highly Voted 1 year, 6 months ago
Selected Answer: BC
Answer: BC Internet and VPN doesn't work with jumbo frame (MTU 1501+) so it will be fragmented. " The files are shared with the Don't Fragment flag set"
upvoted 5 times
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woorkim
Most Recent 1 month, 3 weeks ago
Selected Answer: BC
traffic is limited to a maximum MTU of 1500 in the following cases: Traffic over an internet gateway Traffic over an inter-region VPC peering connection Traffic over VPN connections Traffic between AWS Regions, unless a transit gateway is used
upvoted 1 times
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Arad
1 year, 2 months ago
Selected Answer: BC
BC is the right answer.
upvoted 2 times
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habros
1 year, 3 months ago
Selected Answer: BC
BC. S2SVPN doesn’t support jumbo frames. Internet communication can also contribute to 1500 bytes MTU limit (best is use Direct Connect)
upvoted 2 times
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Certified101
1 year, 5 months ago
Selected Answer: BC
As albertkr said - its BC
upvoted 2 times
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Manh
1 year, 6 months ago
answer is BC https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/network_mtu.html Jumbo frames allow more than 1500 bytes of data by increasing the payload size per packet, and thus increasing the percentage of the packet that is not packet overhead. Fewer packets are needed to send the same amount of usable data. However, traffic is limited to a maximum MTU of 1500 in the following cases: Traffic over an internet gateway Traffic over an inter-region VPC peering connection Traffic over VPN connections Traffic outside of a given AWS Region for EC2-Classic If packets are over 1500 bytes, they are fragmented, or they are dropped if the Don't Fragment flag is set in the IP header.
upvoted 1 times
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tcp22
1 year, 7 months ago
I would go with B and C I don't know how not be able to ping the server would be related.
upvoted 1 times
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AJ7428
1 year, 7 months ago
Selected Answer: BD
Should be BD.
upvoted 1 times
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