The OSI model consists of how many layers?

The correct answer is A. seven. Option A is correct because the OSI (Open Systems Interconnection) model defines exactly seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. Options B (nine), C (five), and D (six) are simply incorrect counts - none correspond to any…

Network Security Fundamentals

Question

The OSI model consists of how many layers?

Options

Aseven
Bnine
Cfive
Dsix

How the community answered

(34 responses)

A
88% (30)
B
6% (2)
C
3% (1)
D
3% (1)

Explanation

Option A is correct because the OSI (Open Systems Interconnection) model defines exactly seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. Options B (nine), C (five), and D (six) are simply incorrect counts - none correspond to any standard networking model, making them straightforward distractors. For comparison, the TCP/IP model has four layers, which may cause confusion, but the OSI model's seven-layer structure is a foundational standard defined by ISO.

Memory tip: Use the mnemonic "Please Do Not Throw Sausage Pizza Away" (Physical, Data Link, Network, Transport, Session, Presentation, Application) - seven words for seven layers.

Topics

#OSI model#Network layers#Model fundamentals

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