Free MongoDB C100DBA Practice Exam Questions and Answers 2026

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Total 134 Questions | Updated On: Apr 01, 2026

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Question 1

Which mongodb tool is used to report details on number of database operations in MongoDB?

A : mongostat

B : mongotop

C : mongorestore

D : mongodump

Answer: A

Question 2

In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

A : Sharding

B : Properly defined user roles

C : Replication

D : Put indexes on all of your documents

E : The proper storage engine

Answer: C

Question 3

You have a replicated cluster with 1 primary, 3 secondary, 1 arbiter. One of the secondary is hidden. What is the replication factor of this replicated cluster?

A : 7

B : 03

C : 04

D : 06

Answer: C

Question 4

What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; '$author', x: { $sum: $likes } } } ] )

A : Average of likes on all the posts of an author, grouped by author

B : Number of posts by an author

C : Sum of likes on all the posts by all the authors

D : Sum of likes on all the posts by an author, grouped by author

Answer: D

Question 5

Which of the following collections stores authentication credentials in MongoDB?

A : test.users

B : local.users

C : system.users

D : users.users

Answer: C

Page: 1 / 27

Total 134 Questions | Updated On: Apr 01, 2026

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