CompTIA Network+ (N10-009) Certification: Complete Guide
Master networking fundamentals with CompTIA Network+ N10-009. Exam domains, costs, subnetting tips, study plan, and practice questions.
CompTIA Network+ (N10-009) Certification: Complete Guide
CompTIA Network+ validates the networking skills every IT professional needs. The current version, N10-009, is a natural next step after A+ and a strong foundation before Security+ or Cisco CCNA.
Who Should Take Network+
- IT support technicians moving into network roles
- Junior network administrators and field engineers
- Anyone who wants vendor-neutral networking fundamentals
Exam Overview
| Aspect | Details |
|---|---|
| Exam Code | N10-009 |
| Questions | Maximum 90 |
| Duration | 90 minutes |
| Passing Score | 720 of 900 |
| Format | Multiple choice and performance-based questions |
| Cost | Around 369 USD (verify current pricing) |
| Validity | 3 years |
Exam Domains (N10-009)
| Domain | Weight |
|---|---|
| Networking Concepts | 23% |
| Network Implementation | 20% |
| Network Operations | 19% |
| Network Security | 14% |
| Network Troubleshooting | 24% |
Key Topics to Master
- The OSI model and how data flows through each layer
- IPv4 and IPv6 addressing, subnetting, and CIDR notation
- Common ports, protocols, and their use cases
- Routing and switching concepts, VLANs, and network topologies
- Wireless standards, troubleshooting methodology, and network security basics
Subnetting is the make-or-break skill on this exam. Convert addresses and masks with an IP to Binary converter until subnet math becomes second nature.
Subnetting Quick Reference
| CIDR | Subnet Mask | Usable Hosts |
|---|---|---|
| /24 | 255.255.255.0 | 254 |
| /25 | 255.255.255.128 | 126 |
| /26 | 255.255.255.192 | 62 |
| /27 | 255.255.255.224 | 30 |
| /28 | 255.255.255.240 | 14 |
Sample Questions
Sample Question 1
Which layer of the OSI model is responsible for logical addressing and routing?
A) Layer 2 - Data Link
B) Layer 3 - Network
C) Layer 4 - Transport
D) Layer 7 - Application
Answer: B - Layer 3 handles logical (IP) addressing and routing.
Sample Question 2
What is the default port for HTTPS?
A) 21
B) 80
C) 443
D) 3389
Answer: C - HTTPS uses TCP port 443.
Recommended Resources
- CompTIA Network+ Official Page
- Official study guide and CertMaster Labs
- Packet Tracer or GNS3 for hands-on practice
Practice with ExamCert
The best way to get exam-ready is realistic practice. Try the free CompTIA Network+ (N10-009) question bank on ExamCert, with exam-style questions and detailed explanations so you learn from every miss.
👉 CompTIA Network+ (N10-009) practice test
Conclusion
CompTIA Network+ gives you the networking foundation that powers the rest of your IT career. Master subnetting, drill practice exams, and you will pass N10-009 with confidence.