There isn’t really much I can tell about the defense itself without giving up way to much information so keep in mind this post is intentionally very vague.
As I mentioned in a previous post the defense itself has three distinct sessions.
The defense itself to defend the design and show the panelist you know everything there is to know about your design, including alternatives and expert level understanding of how different technologies/requirements/constraints can impact your design.
The design scenario to show the panelist that you fully understand the VMware design methodology and can use it during customer meetings. Its like a quality assurance test for the VCDX candidate design skill level for VMware.
The troubleshooting scenario is to show the panelist your technical skill level regarding the track you are going for and the method you use. The method is more about speeding the troubleshooting cause you have very limited time. There are very different technology stacks between the four VCDX tracks for the troubleshooting to focus on.
And just remember that the panelist is not there to make you fail, they are there to help you by asking questions that you can answer to increase the score (assumption on my part).
The time will fly away as soon as you start and before you know it the first section is done. Then you get a short break before the second section and before you know it that time has passed as well. Your brain will go into autopilot mode during the sections.
Then you are done. Expect to feel releaved and somewhat mentally tired. Don’t expect to run on full capacity the following days or week. It is quite normal to not remember exactly who was on your panelist.
Now only a “long” wait until the result email arrives.