How long does it take to prepare for the Certified Tester - Infrastructure?

Preparation time for a expert exam of this size is usually measured in weeks.

Which Certified Tester - Infrastructure domain should I study first?

Network Infrastructure and Protocols, at 25% of the exam. It carries the most weight, so it is where your preparation effort returns the most points.

Should I do practice questions or read a book?

Do practice questions first for any domain you are weak in, and read for the ones you understand but cannot apply. Reading everything twice is the most common way to fail: it feels like progress and it is not. Certilum has 60 questions for this exam, scored per domain against the official weights.

What score should I have on a mock before booking the exam?

At least 76% on a timed mock in the real format. The 66% cut score leaves very little margin.

What is the single best way to find my weak domain?

Take one full mock, then look at the per-domain breakdown rather than the total. The total tells you whether you passed; the breakdown tells you which domain to study next, and that is the only actionable number in the result.

Study plan

How to Pass the Certified Tester - Infrastructure Exam

CCT INF

A study plan for the Certified Tester - Infrastructure certification exam, built from the official domain weights instead of a generic template. Focus on practical lab environments such as Hack The Box, TryHackMe, and custom lab setups replicating real-world infrastructure. Combine structured study with official CREST resources, practice tests, and community forums. Dedicate 2-4 months of regular practice, emphasizing tool proficiency and methodology documentation.

5 domains

60 questions

66% to pass

certilum

Study in weight order, not topic order

The plan below follows the official blueprint weights, so the order of study is the order that returns the most points.

1
Network Infrastructure and Protocols
25%
- OSI and TCP/IP model fundamentals
- Common network protocols (HTTP, HTTPS, DNS, DHCP, ARP, ICMP)
- Network addressing and subnetting
- Routing and switching concepts
- +2 more topics in the blueprint
15 practice questions tagged to this domain.
2
Operating System and Database Security
20%
- Windows and Linux security hardening
- User account management and privilege escalation
- File system permissions and access controls
- Database security principles ( injection, authentication)
- +2 more topics in the blueprint
12 practice questions tagged to this domain.
3
Security Testing Methodologies and Tools
20%
- Penetration testing lifecycle and methodologies
- Reconnaissance and information gathering techniques
- Vulnerability scanning tools (Nessus, OpenVAS)
- Exploitation frameworks (Metasploit, Burp Suite)
- +2 more topics in the blueprint
12 practice questions tagged to this domain.
4
Application Security and Web Technologies
20%
- Web application architecture and common vulnerabilities (OWASP Top 10)
- Authentication and session management flaws
- Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF)
- Secure coding practices and input validation
- +2 more topics in the blueprint
12 practice questions tagged to this domain.
5
Legal, Regulatory, and Professional Standards
15%
- Legal frameworks for security testing (Computer Misuse Act, GDPR)
- Scope definition and rules of engagement
- Reporting and documentation standards
- Ethical hacking code of conduct
- +2 more topics in the blueprint
9 practice questions tagged to this domain.

Three phases, in order

Most failures are process failures, not knowledge failures.

Step 1

Phase 1 — Learn the high-weight domains

Start where the points are. The first domains on this plan carry the most weight, so a gap there costs the most. Cover the objectives, then close each topic with practice questions you actually get wrong.

Step 2

Phase 2 — Close the mid-weight domains

The middle of the blueprint is where most candidates plateau. These domains are worth less per topic than the first phase, but they add up fast, and they are the usual difference between a near miss and a clear pass.

Step 3

Phase 3 — Timed full mocks

Stop reading new material at this point. Run full-length exams under the real time limit and the real format, and use the per-domain breakdown to find which domain is still costing you the pass.

Where we put the emphasis

Certilum’s 12‑week study plan for Certified Tester – Infrastructure: weeks 1‑4 networking/OS fundamentals with interactive quizzes, weeks 5‑8 web application security and exploitation tools, weeks 9‑12 methodology, reporting, and mock exams. Structured domain summaries and tool cheat sheets reinforce weak areas under timed conditions.

The order matters less than the loop. Every domain you finish should end with questions you got wrong, because the mistake is the only thing you actually needed to study. On the Certified Tester - Infrastructure that loop is worth 25% of the exam in the first block alone.