Preview CompTIA Network+ prep
Vendor-neutral networking certification prep with computed subnetting and binary-conversion questions, plus OSI-layer, protocol/port and security fact banks.
Sample lesson
The OSI Model
Which layer handles which networking function.
The OSI Model, or Open Systems Interconnection Model, is a conceptual framework used to understand network interactions in seven layers. Each layer has specific functions and protocols that facilitate communication over a network.
The OSI Model consists of seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. Each layer has distinct responsibilities, from transmitting raw bits to providing application services.
Read-only preview. Quizzes and progress tracking start in the full course.
What a mock looks like
Network+-style Mock Exam
90 minutes total, with sections timed individually.
- Networking Concepts (23%)21 min
- Network Implementation (20%)18 min
- Network Operations (19%)17 min
- Network Security (14%)13 min
- Network Troubleshooting (24%)21 min
A network administrator must divide 10.8.4.0/24 into equal-sized subnets. Each subnet must support at least 25 hosts, and the design should provide as many subnets as possible. Which of the following meets these requirements?
- /27, giving 8 subnets of 30 usable hosts each
- /26, giving 4 subnets of 62 usable hosts each
- /28, giving 16 subnets of 14 usable hosts each
- /27, giving 8 subnets of 32 usable hosts each