300-415 Question 282
Single answerA company has deployed a Cisco SD-WAN solution and is observing slow performance for applications that rely heavily on TCP traffic over long-distance WAN links. The network engineer is tasked with improving the performance of these applications. Which feature should the engineer enable to optimize TCP traffic in this scenario?
- A
TCP window scaling
- B
Forward Error Correction (FEC)
- C
TCP payload compression
- D
Dynamic Path Selection
Show answer and explanation
Correct answer: A
Explanation
The correct answer is TCP window scaling because it directly addresses the challenge of optimizing TCP traffic over long-distance links. By increasing the TCP window size, the throughput can be improved even in high-latency environments. Other options like FEC and Dynamic Path Selection help with reliability and path optimization but do not specifically address TCP performance issues.
- A. Correct.
TCP window scaling is a feature that allows the TCP window size to grow, enabling more data to be sent before requiring an acknowledgment. This is especially useful for optimizing TCP traffic over high-latency or long-distance WAN links.
- B. Incorrect.
Forward Error Correction (FEC) is used to recover lost packets and improve reliability but does not directly optimize TCP performance related to latency or throughput.
- C. Incorrect.
TCP payload compression reduces the size of TCP packets but does not address the underlying issue of slow performance caused by latency and TCP window limitations.
- D. Incorrect.
Dynamic Path Selection is a feature in Cisco SD-WAN for choosing the best path based on network performance metrics, but it does not specifically optimize TCP traffic itself.