300-415 Question #405: Real Exam Question with Answer & Explanation

The correct answer is D: flow symmetry. To support Data Redundancy Elimination (DRE) in a Cisco SD-WAN environment, flow symmetry is a critical condition, ensuring that both forward and reverse traffic for a given flow traverse the same path.

WAN Edge Router Deployment

Question

Which condition must be present to support DRE in a Cisco SD-WAN environment?

Options

Aclient-server topology
BTCP optimization
Chub-and-spoke topology
Dflow symmetry

Explanation

To support Data Redundancy Elimination (DRE) in a Cisco SD-WAN environment, flow symmetry is a critical condition, ensuring that both forward and reverse traffic for a given flow traverse the same path.

Common mistakes.

A. DRE can be applied to various traffic patterns, not exclusively client-server topologies; it works on any traffic that exhibits redundancy.
B. TCP optimization is a separate feature that can improve TCP performance, but it is not a prerequisite for DRE; DRE focuses on data compression and de-duplication.
C. While DRE can be deployed in hub-and-spoke topologies, it is not a required condition for DRE support; DRE can also function in full-mesh or other topologies as long as flow symmetry is maintained.

Concept tested. Cisco SD-WAN Data Redundancy Elimination (DRE) requirements

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-xe-gs-book_chapter_0100.html

Topics

#DRE#Data Redundancy Elimination#Flow Symmetry#WAN Optimization#Cisco SD-WAN

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