Topic 1 Question 123

AWS Certified Advanced Networking - Specialty

Topic 1 Question 123
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?

2 つ選択
- The source IP addresses are from on-premises hosts that are routed over AWS Direct Connect.
- The source IP addresses are from on-premises hosts that are routed over AWS Site-to-Site VPN.
- The source IP addresses are from hosts that connect over the public internet.
- The security group of the EC2 instances does not allow ICMP traffic.
- The operating system of the EC2 instances does not support jumbo frames.
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コメント(8)
- 正解だと思う選択肢: 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.
  
  👍 3
  albertkr2023/06/27
- 正解だと思う選択肢: 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"
  
  👍 2
  JosMo2023/07/03
- 正解だと思う選択肢: BD
  Should be BD.
  
  👍 1
  AJ74282023/06/12
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