Hi,
You can pass SC-100 and then pass one of the prerequisite exams if you want--that is what I did. Please note that you will not receive Microsoft Certified: Cybersecurity Architect Expert certification until you pass one of the prerequiste exams.
For example, if you pass SC-100 tomorrow and then pass SC-300 next week, you will not receive Microsoft Certified: Cybersecurity Architect Expert certification until next week after SC-300 exam is passed.
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Thanks.
-TP