Implementing Cisco SD-WAN Solutions (ENSDWI) — Question 120

Which TCP Optimization feature is used by WAN Edge to prevent unnecessary retransmissions and large initial TCP window sizes to maximize throughput and achieve a better quality?

Answer options

• A. SACK
• B. SEQ
• C. RTT
• D. SYN

Correct answer: A

Explanation

The correct answer is A, SACK (Selective Acknowledgment), which helps optimize TCP by allowing the receiver to inform the sender about all segments that have been received successfully, thus preventing unnecessary retransmissions. Options B (SEQ), C (RTT), and D (SYN) do not provide the same functionality in terms of managing retransmissions or optimizing window sizes.