CS Study Guide 2026
Everything you need to pass the CS exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 CS Exam Format at a Glance
📚 CS Topics to Study (69)
✍️ Sample CS Questions & Answers
1. Google Workspace and Microsoft 365 are examples of which cloud service model?
SaaS delivers complete, ready-to-use applications over the internet with no infrastructure management by the user.
2. What advantage do containers have over traditional virtual machines for deployment?
Containers virtualize at the OS level and share the host kernel, so they use fewer resources and start in seconds compared to VMs.
3. What trade-off does loop unrolling typically make to improve performance?
Unrolling replicates the loop body, growing code size but reducing loop-control and branch overhead.
4. A phishing email directs users to a fake login page that captures credentials. Which defense most directly limits the damage of stolen passwords?
Even with the stolen password, the attacker cannot log in without the second factor.
5. A program repeatedly accesses a 2D array column-by-column instead of row-by-row in a row-major language like C. What is the primary performance cost?
Column-wise traversal of a row-major array jumps across memory, defeating spatial locality and causing cache misses.
6. Which data management principle is critical in Computer Science?
Effective data management requires maintaining data integrity, protecting it from unauthorized access, and ensuring it is accessible when needed.