Which of the following is a correct sequence of different layers of Open System Interconnection (OSI) model?

Question

Options

• APhysical layer, data link layer, network layer, transport layer, presentation layer, session layer,
• BPhysical layer, network layer, transport layer, data link layer, session layer, presentation layer,
• Capplication layer, presentation layer, network layer, transport layer, session layer, data link
• DPhysical layer, data link layer, network layer, transport layer, session layer, presentation layer,

• A
  2% (1)
• C
  4% (2)
• D
  94% (49)

Explanation

Option D correctly sequences the OSI layers from the bottom up: Physical → Data Link → Network → Transport → Session → Presentation → Application (the answer truncates before Application, but all shown layers are in the right order).

Why the distractors are wrong:

• A swaps Session and Presentation - it lists Presentation before Session, which reverses layers 5 and 6.
• B swaps Data Link and Network - it lists Network in position 2 and Data Link in position 4, breaking the correct 1-2-3 order at the bottom.
• C skips Session entirely between Presentation and Network, and places Network before Transport, violating the correct top-down sequence.

Memory tip: Use the mnemonic "Please Do Not Throw Sausage Pizza Away" - Physical, Data Link, Network, Transport, Session, Presentation, Application - reading from layer 1 (bottom) to layer 7 (top). This locks in the exact order so swapped layers in distractors immediately stand out.

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