C100DEV Drivers, Tools, Transactions, and Search Practice Question
What is the primary function of the MongoDB connection pool in a driver?
⚠ Common exam trap
Candidates often think connection pools limit the total concurrent users an application can support, confusing connection reuse with maximum concurrent thread limits.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To reduce the latency of opening new connections.
A connection pool maintains a cache of open connections to the database server. Reopening a connection for every request is expensive due to the overhead of TCP handshakes and authentication. By reusing existing connections, the driver significantly reduces latency and resource consumption, allowing the application to handle high volumes of traffic more efficiently and providing a more stable connection to the database layer.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To encrypt data in transit between the client and the server.
Why it's wrong here
Encryption in transit is handled by TLS/SSL configuration, which is a separate layer of security. The connection pool manages the lifecycle of the socket connections themselves, not the security protocols used for data transmission. While it works within the secure tunnel, it is not its function.
- ✓
To reduce the latency of opening new connections.
Why this is correct
Establishing a new TCP connection and performing the authentication handshake takes significant time. A connection pool keeps these connections open, so when the application needs to perform a query, it can grab an existing, authenticated connection from the pool instantly, drastically improving the response time for database operations.
- ✗
To automatically shard data based on the client's request.
Why it's wrong here
The connection pool is responsible for communication channels, not data distribution. Sharding is managed by the MongoDB server cluster and the mongos router. The client driver's role is simply to route the request to the correct location; it has no role in the underlying sharding logic of data.
- ✗
To store query results in memory for faster retrieval.
Why it's wrong here
Storing query results is the job of a cache (like Redis) or the server's own WiredTiger cache. The connection pool does not cache data; it only manages the physical network connections. Caching data within the driver would be dangerous due to consistency and memory management issues in an application.
Visual reference
About these practice questions
One of 259 original C100DEV practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official MongoDB exam blueprint
This C100DEV practice question is part of Courseiva's free MongoDB certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the C100DEV exam.