I don't understand Qustion 6

Since “_id” is a shard key, then why find{"_id":455} is a scatter-gather query rather than routed?

@chen_28695 as it’s strictly against forum guidelines to post potential answers to exams, please edit your post accordingly. You will also be receiving a private message from one of the Curriculum Support Engineers to whom you can privately discuss your query.

In the meantime, please review the Detailed Answer and the Routed Queries vs Scatter Gather: Part 1 lecture in Chapter 3.

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Shubham Ranjan
Curriculum Support Engineer