The CISSP exam explained: CAT format, length, score

Before revising, you need to understand what you are up against. Here is how the CISSP exam works: adaptive format, number of questions, duration, scoring and test-day strategy.

The adaptive format (CAT)

In English, the exam uses CAT (Computerized Adaptive Testing): the algorithm adjusts the difficulty of each question based on your previous answers. The more you get right, the harder questions become — and vice versa. Important consequence: you cannot go back to a question you have already submitted.

• Questions: 100 to 150.
• Duration: 3 hours.
• Passing score: 700 out of 1000.

In other languages, the exam may be offered in a linear format (fixed questions, longer). Always check the current details on isc2.org.

Question types

Most are 4-option MCQs framed as scenarios. There are also a few advanced items (drag-and-drop, hotspots on a diagram). The classic trap: several answers look correct. You must pick the best one, from a security manager's point of view — not the most technical.

The 8-domain weighting

Each domain carries a percentage of the score. Domain 1 is the heaviest (16%). See the detail and the 8-domain overview to prioritize your revision.

Test-day strategy

1. Manage time: ~1.5 min per question. Don't get stuck; decide and move on.
2. Read the whole scenario: the context (role, phase, constraint) points to the right answer.
3. Eliminate first: drop the 2 clearly wrong options, then choose between the 2 remaining from a risk-management angle.
4. Think "preventive > detective > corrective" and "people & policy before technology": often the key to the "best" choice.
5. Don't panic if questions get harder: in CAT, that's a good sign.

Frequently asked questions

How many questions are on the CISSP exam?

100 to 150 (adaptive CAT format, English), in 3 hours.

What is the passing score?

700 out of 1000. The pass/fail result is given shortly after the exam.

What is the CAT format?

An adaptive test: difficulty adjusts to your answers, with no going back.

See also: how to pass the CISSP and the study plan.