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300-415 · Question #88

An engineer is tasked to improve throughput for connection-oriented traffic by decreasing round-trip latency Which configuration will achieve this goal?

The correct answer is A. turn on "Enable TCP Optimization". Enabling TCP Optimization on the WAN Edge allows the SD-WAN fabric to proxy TCP connections and tune TCP behavior, improving throughput for connection-oriented traffic by reducing the impact of WAN latency.

Security and Quality of Service

Question

An engineer is tasked to improve throughput for connection-oriented traffic by decreasing round-trip latency Which configuration will achieve this goal?

Options

  • Aturn on "Enable TCP Optimization"
  • Bturn off "Enhance ECMP Keying"
  • Cturn off "Enable TCP Optimization"
  • Dturn on "Enhance ECMP Keying"

How the community answered

(23 responses)
  • A
    91% (21)
  • B
    4% (1)
  • C
    4% (1)

Why each option

Enabling TCP Optimization on the WAN Edge allows the SD-WAN fabric to proxy TCP connections and tune TCP behavior, improving throughput for connection-oriented traffic by reducing the impact of WAN latency.

Aturn on "Enable TCP Optimization"Correct

TCP Optimization intercepts TCP connections at each WAN Edge and applies techniques such as TCP proxy, window scaling, and SYN spoofing to decouple the high-latency WAN segment from the local LAN segment. This reduces effective round-trip latency seen by TCP endpoints, enabling faster window growth and higher throughput for connection-oriented traffic.

Bturn off "Enhance ECMP Keying"

Disabling Enhance ECMP Keying affects load-balancing hash inputs across equal-cost paths, but does not directly reduce RTT or improve TCP throughput.

Cturn off "Enable TCP Optimization"

Turning off TCP Optimization would leave TCP connections unoptimized across the WAN, worsening rather than improving throughput under high-latency conditions.

Dturn on "Enhance ECMP Keying"

Enhance ECMP Keying improves flow distribution across multiple WAN links, but enabling it does not reduce round-trip latency or improve per-flow TCP throughput.

Concept tested: Cisco SD-WAN TCP Optimization for WAN throughput improvement

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/qos/ios-xe-17/qos-book-xe/m-appqoe-tcp-opt.html

Topics

#TCP Optimization#SD-WAN Performance#Latency Reduction#Throughput Improvement

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