300-415 Question 280
Single answerAn enterprise has deployed Cisco SD-WAN across multiple branch offices. They are experiencing high latency and suboptimal throughput for applications such as file transfers and database replication over their WAN circuits. The network team decides to implement TCP optimization using Cisco SD-WAN. Which feature should the team enable to address this issue effectively?
- A
TCP Window Scaling
- B
Dynamic Path Selection
- C
Forward Error Correction (FEC)
- D
On-Demand Tunnel Creation
Show answer and explanation
Correct answer: A
Explanation
TCP Window Scaling is a critical feature for optimizing TCP performance in Cisco SD-WAN environments. It ensures efficient use of available bandwidth, particularly over high-latency links, by dynamically adjusting the TCP window size. This directly addresses problems like slow file transfers and database replication caused by TCP's default behavior over WAN circuits.
- A. Correct.
TCP Window Scaling allows for better utilization of available bandwidth by dynamically adjusting the TCP window size, which is crucial for optimizing performance over high-latency links.
- B. Incorrect.
Dynamic Path Selection is used to direct traffic over the most optimal path, but it does not directly address issues like TCP throughput or latency optimization.
- C. Incorrect.
Forward Error Correction (FEC) is designed to recover lost packets but does not directly optimize TCP performance or handle issues like window size or throughput.
- D. Incorrect.
On-Demand Tunnel Creation allows for the creation of tunnels as needed, but it does not optimize TCP connections or performance.