Network+ Cheat Sheet.
The night-before summary, built like the exam.

Exam Logistics at a Glance

Content Domains

The exam is organized into five content domains, each weighted differently. Domain weight is one of the highest-leverage things to internalize before study planning — spend your prep hours in proportion to these percentages, not evenly.

• Domain 1: Networking Concepts — 23%. The second-largest domain; expect deep coverage of protocols, ports, cabling standards, and topologies.
• Domain 2: Network Implementation — 20%. Deploying and configuring routers, switches, wireless, and cloud connectivity.
• Domain 3: Network Operations — 19%. Monitoring, documentation, disaster recovery, and high-availability concepts.
• Domain 4: Network Security — 14%. The lightest-weighted domain, but still a frequent source of scenario questions; covers hardening, physical security, and common attacks.
• Domain 5: Network Troubleshooting — 24%. The single largest domain — treat troubleshooting methodology as the backbone of your study plan, not an afterthought.

Domain Priority Order for Study Time

1. Network Troubleshooting (24%)
2. Networking Concepts (23%)
3. Network Implementation (20%)
4. Network Operations (19%)
5. Network Security (14%)

Key Terms and Concepts to Memorize

• The OSI model layers and what happens at each layer — this underpins nearly every troubleshooting scenario question.
• TCP vs. UDP behavior, and the well-known ports tied to common services.
• Subnetting and CIDR notation — expect to calculate subnets, not just recognize them.
• Switching concepts: VLANs, trunking, STP, and port security fundamentals.
• Routing basics: static vs. dynamic routing, and the purpose of common routing protocols.
• Wireless standards, frequencies, and common wireless security modes.
• Cloud connectivity concepts and common cloud service models as they intersect with networking.
• Common physical and logical network diagrams and documentation practices.
• The structured troubleshooting methodology — identify the problem, establish a theory, test, establish a plan, implement, verify, and document.
• Common network security hardening techniques and physical security controls.

Common Gotchas and Traps

• Performance-based questions (PBQs) simulate real configuration tasks — they are not just multiple choice, so budget extra time for them and don't panic if they appear early in the exam.
• Domain weighting is not evenly distributed; under-studying Network Troubleshooting or Networking Concepts because they feel "conceptual" rather than "hands-on" is a common mistake given they're the two heaviest domains.
• Read scenario questions carefully for qualifiers like "MOST likely" or "BEST" — multiple answers are often technically true, but only one best fits the described constraints.
• Don't confuse this exam's prerequisites with hard requirements — CompTIA recommends prior A+ certification and hands-on experience, but nothing stops you from testing directly if you already have the knowledge.
• Renewal is easy to forget about after passing — certification isn't permanent, and lapsing on continuing education requirements means having to retake the current exam version.
• Scheduling logistics catch people off guard; exams are booked through CompTIA's own candidate portal rather than directly through a testing center's website.

Night-Before Checklist

• Confirm your exam appointment, format (test center vs. online proctoring), and ID requirements through your CompTIA Central account.
• Do a final pass on domain weight priorities: Troubleshooting and Networking Concepts first, then Implementation, Operations, and Security.
• Review the structured troubleshooting methodology steps in order until you can recite them without hesitation.
• Skim subnetting practice problems one more time — speed on CIDR math pays off across multiple domains.
• Review common port numbers and protocol-to-layer mappings.
• If testing online, verify your room setup, webcam, and ID meet proctoring requirements the night before, not the morning of.
• Get a full night's sleep rather than cramming new material — recall performs worse on fatigue than on a slightly thinner review.
• Plan to arrive or log in early; the 90-minute window starts once the exam begins, so don't lose time to check-in delays.