Discover potential reasons for file transfer failures on Amazon EC2 instances in a cluster placement group. Explore how connectivity issues from on-premises, public internet, and ICMP restrictions might impact file sharing.
Table of Contents
Question
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.
Answer
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.
Explanation
The failures could stem from multiple sources:
A. On-premises Connectivity: The source IP addresses from on-premises hosts, especially if routed over AWS Direct Connect or AWS Site-to-Site VPN, might face routing or connectivity issues when accessing files due to potential network configurations.
B. Public Internet Connectivity: Requests from hosts connecting over the public internet might encounter packet loss or fragmentation issues, especially with the Don’t Fragment flag set, causing file transfer failures.
C. ICMP Traffic Restrictions: If the security group of the EC2 instances restricts ICMP traffic, this could hinder the effective transmission of files, potentially leading to failures.
These factors—on-premises routing, public internet access, and potential restrictions on ICMP traffic—could contribute to the failures experienced by clients in receiving requested files.
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