300-415 Question #338: Real Exam Question with Answer & Explanation

The correct answer is B: The upgrade fails with a warning message.. In Cisco SD-WAN, controller devices must run software equal to or higher than WAN Edge devices. Attempting to upgrade a WAN Edge to a version higher than the controller results in a failure with a warning message.

Management and Operations

Question

What is the result during a WAN Edge software upgrade process if the version of the WAN Edge software is higher than the one running on a controller device?

Options

AThe upgrade button is greyed out.
BThe upgrade fails with a warning message.
CThe upgrade proceeds with a warning message.
DThe upgrade proceeds with no warning message.

Explanation

In Cisco SD-WAN, controller devices must run software equal to or higher than WAN Edge devices. Attempting to upgrade a WAN Edge to a version higher than the controller results in a failure with a warning message.

Common mistakes.

A. The upgrade button is not greyed out because the system allows the attempt to be initiated before enforcing the version check.
C. The upgrade does not proceed under any condition when the WAN Edge version would exceed the controller version - it is blocked outright.
D. The system does not silently allow an incompatible upgrade; it always surfaces a warning when the version constraint is violated.

Concept tested. SD-WAN software version compatibility enforcement

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/release/notes/compatibility-matrix/cisco-catalystsd-wan-compatibility-matrix.html

Topics

#SD-WAN upgrade#WAN Edge software#Controller software#Version compatibility

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