ANS-C01 Question 429
Single answerYour organization is using an AWS Direct Connect connection to transfer large amounts of data between your on-premises data center and Amazon S3. The connection type is Ethernet-based with a link speed of 10 Gbps. Network latency is minimal, but you notice that the bandwidth utilization is suboptimal. After reviewing the configuration, you suspect that the frame size is not optimized. What is the best approach to optimize the bandwidth utilization?
- A
Enable Jumbo Frames on your network devices and configure the MTU to 9001 on the Direct Connect interface.
- B
Reduce the MTU size on your network devices to 1400 to accommodate smaller packet sizes.
- C
Enable flow control on all devices in the data path to avoid packet loss and ensure reliability.
- D
Increase the TCP window size to allow for more unacknowledged packets in transit.
Show answer and explanation
Correct answer: A
Explanation
When using AWS Direct Connect, enabling Jumbo Frames (MTU 9001) can significantly improve bandwidth utilization by allowing the transmission of larger Ethernet frames. Larger frames reduce the per-frame overhead, leading to more efficient data transfer. This optimization is particularly beneficial for high-speed connections like 10 Gbps where overhead can be a limiting factor. Other options, such as reducing the MTU or enabling flow control, do not directly optimize bandwidth utilization in this scenario.
- A. Correct.
Enabling Jumbo Frames and setting the MTU to 9001 allows for larger packets to be transmitted, reducing overhead and increasing bandwidth efficiency. This is the recommended approach for optimizing bandwidth utilization with AWS Direct Connect.
- B. Incorrect.
Reducing the MTU to 1400 is counterproductive in this scenario as it increases the overhead per packet, leading to worse bandwidth utilization.
- C. Incorrect.
While enabling flow control can help with reliability, it does not directly address bandwidth optimization through frame size adjustments.
- D. Incorrect.
Increasing the TCP window size may improve throughput in high-latency networks, but in this low-latency scenario, it does not address frame size optimization.