ANS-C01 Question 426
Select 3You are designing a multi-region application that communicates between on-premises data centers and AWS VPCs over a Direct Connect connection. The application involves transferring large files, and you aim to optimize bandwidth utilization. Which of the following actions should you take to ensure efficient frame size usage across the connection types?
- A
Enable jumbo frames on your Direct Connect interface and ensure all intermediary devices support MTU 9001.
- B
Configure your on-premises network equipment to match the MTU size of the AWS Direct Connect interface.
- C
Set the MTU size to 1500 on all devices to avoid potential fragmentation issues.
- D
Ensure TCP Maximum Segment Size (MSS) is adjusted to match the MTU to prevent unnecessary retransmissions.
- E
Use AWS Global Accelerator to automatically optimize MTU sizes across the connection.
Show answer and explanation
Correct answers: A, B, D
Explanation
To optimize bandwidth for large file transfers over Direct Connect, you should enable jumbo frames (MTU 9001) if supported, align MTU settings across your network, and adjust TCP MSS accordingly. These actions reduce packet fragmentation and overhead, improving efficiency. Setting MTU to 1500 is less optimal for large transfers, and AWS Global Accelerator does not address MTU optimizations.
- A. Correct.
Correct. Jumbo frames (MTU 9001) can reduce the overhead of headers for large file transfers. However, all intermediate devices, including AWS Direct Connect and your network equipment, must support them.
- B. Correct.
Correct. Consistent MTU size across the on-premises network and AWS Direct Connect prevents packet fragmentation and optimizes bandwidth.
- C. Incorrect.
Incorrect. Setting MTU to 1500 is a safe choice for compatibility but does not optimize bandwidth for large file transfers.
- D. Correct.
Correct. Adjusting TCP MSS to match the MTU ensures efficient use of the network without unnecessary retransmissions.
- E. Incorrect.
Incorrect. AWS Global Accelerator does not manage MTU optimizations; it is designed for improving the performance and availability of global applications.