Remember OSI
Full name: Open Systems Interconnection
Memory aid: All People Seem To Need Data Processing recalls layers seven down to one.
The OSI model is a reference model; actual Internet protocols do not map perfectly to every layer.
Study area: Network architecture & switching · Batch 6
Relevant study for: CompTIA Network+ N10-009 · Cisco CCNA 200-301 · CompTIA Security+ SY0-701 · ISC2 CISSP 2024 outline
Practice with exam flashcards →Networking & Connectivity / Knowledge library
OSI — Open Systems Interconnection
Provides a seven-layer reference model for network functions.
Why learn OSI — Open Systems Interconnection?
Provides a seven-layer reference model for network functions.
Where it came from
The OSI model is a reference model; actual Internet protocols do not map perfectly to every layer.
- Memory aid (a learning cue, not the expansion): All People Seem To Need Data Processing recalls layers seven down to one.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Without looking, expand OSI: Open Systems Interconnection.
- Recall this memory aid: All People Seem To Need Data Processing recalls layers seven down to one.
- Explain the practical use: Provides a seven-layer reference model for network functions.
- Explain this distinction: The OSI model is a reference model; actual Internet protocols do not map perfectly to every layer.
- Identify OSI in a device specification, architecture diagram, or system inventory.
Documentation and sources
- IEEE 802 LAN/MAN standards (www.ieee802.org)
- IETF Internet standards (www.rfc-editor.org)