Security Plus Practice Test

How Security+ Practice Tests Actually Work (And Where People Mess Up)

I've watched people fail the Security+ exam despite grinding through dozens of practice exams. The issue usually isn't a lack of studying. It's studying the wrong way. A proper Security Plus Practice Test mimics the structure and difficulty of the actual CompTIA exam, which uses performance-based questions at the start followed by multiple choice and drag-and-drop items. If you're just reading answers after each question, you're not preparing correctly. The actual exam is 90 minutes long with up to 90 questions. You need a score of 720 out of 900 to pass. Questions cover six domains: threats and attacks, architecture and design, implementation, operations and incident response, governance and compliance, and cryptography. The trick is that many questions have two or more correct answers listed, and you need to select all that apply. This trips people up constantly. I've seen candidates pick one correct answer when the question explicitly asked for two, and they got it marked wrong even though their single answer was technically correct. Performance-based questions appear first in the exam. These are simulations where you drag and drop configurations, assign network segments to firewall rules, or configure access controls in a virtual environment. They don't give you multiple choice options. You have to build the solution from scratch. These typically account for about 10 to 15 of your total questions.

Here's something most people don't realize: you can skip performance-based questions and come back to them later, but the timer keeps running the entire time. I once knew someone who spent 22 minutes on a single drag-and-drop question about VPN tunnel configuration. He barely finished the rest of the exam. The workaround is to flag it, move on, and return only if you have time remaining. That single decision probably determined whether he passed or failed.

Picking the Right Practice Material

Not all practice tests are created equal. The cheapest option is usually the worst because the question quality drops significantly. You'll find outdated content referencing technologies CompTIA no longer tests, like WEP or SHA-1 as primary recommendations. The exam updated its objectives recently, and some older practice test banks never caught up. I ran into this myself when I was prepping a team for their exams last year. One of our candidates scored 85% on a popular free practice test and then scored 62% on the real exam. The gap existed because the free test had maybe 20% of its questions covering legacy topics that aren't on the current exam anymore. Meanwhile, critical areas like zero trust architecture and supply chain security were underrepresented in the practice material. CompTIA's own official practice test is the closest match to the actual exam in terms of question style and difficulty. It costs around $40 and runs about 60 questions. The questions feel more like the real thing than most third-party options. Third-party providers like Jason Dion, Professor Messer, and TestOut offer solid alternatives at various price points. Dion's practice exams tend to be slightly harder than the actual exam, which is useful for building confidence. TestOut has a simulation environment that closely mirrors the performance-based question format. The domain weightings matter when you're choosing which practice tests to prioritize. Governance, risk, and compliance makes up about 15% of the exam. Cryptography and the public key infrastructure is roughly 14%. Threats, vulnerabilities, and attacks account for 15%. Network and wireless security is about 12%. Identity and access management covers 14%. The remaining 20% is split between architecture, implementation, operations, and incident response. If your practice test results show you scoring below 65% in any domain, you should focus your remaining study time there before scheduling the actual exam.

A Specific Problem I Encountered

One edge case that caused headaches involved the Port Scanning and Protocol Analysis performance-based question. The simulation presents you with firewall logs and requires you to identify which entries represent a port scan versus normal traffic patterns. The challenge is that the tool doesn't clearly differentiate between TCP and UDP traffic in the initial view, and the timestamp resolution can be tricky. I had a candidate go through this question three times because she was comparing the log entries using the wrong columns. She was looking at source port instead of destination port. The workaround was simple but not obvious: she needed to sort by destination port and look for sequential port attempts from a single source IP within a short time window. This was one of those questions where the knowledge mattered less than knowing how to use the interface efficiently. The biggest mistake is treating practice tests like flashcards. When you get a question wrong, most people immediately read the explanation and move on. This creates a false sense of competence. You're recognizing the right answer, not demonstrating that you know why it's right. A better approach is to mark every incorrect question, review the concept, and then re-attempt the entire section without looking at any answers. This takes longer but actually builds retention. Another issue is ignoring the exam objectives document. CompTIA publishes a detailed PDF outlining exactly what's tested. Some people skip this and rely entirely on third-party study guides. The problem is that guide writers sometimes emphasize topics that seem important but carry less weight on the actual exam. The objectives document is your blueprint. If it says something is listed under a sub-topic, that sub-topic is fair game for the exam regardless of how much a study guide downplays it.

There's also the question of simulation software. Some practice test providers use platforms that feel completely different from the actual exam interface. If you've only practiced on a web-based quiz format, the transition to CompTIA's testing environment can be jarring. The real exam uses a specific interface with a timer in the corner, a question navigator on the side, and a flagging system. Wasting time figuring out how to navigate during the exam costs you minutes you don't have. I recommend doing at least one full practice exam in an environment that closely resembles the actual testing platform. Performance-based questions are notoriously hard to practice effectively because creating realistic simulations is expensive and time-consuming. Most practice tests include only two or three of these, while the real exam can have up to 15. This means you're likely underprepared for that portion of the exam regardless of which provider you choose. The best you can do is familiarize yourself with common task types: firewall rule configuration, VLAN assignment, access control list setup, and log analysis. If you can manipulate a virtual network environment confidently, you'll handle whatever the exam throws at you.