200-150 · Question #122
What is the order of the OSI stack starting at Layer 1 and ending at Layer 7?
The correct answer is D. Physical, Data Link, Network, Transport, Session, Presentation, Application. This question tests memorization of the seven OSI model layers in correct order from Layer 1 (Physical) to Layer 7 (Application).
Question
What is the order of the OSI stack starting at Layer 1 and ending at Layer 7?
Options
- AApplication, Presentation, Session, Transport, Network, Data Link, Physical
- BApplication, Presentation, Transport, Data Link, Session, Physical, Network
- CPhysical, Network, Transport, Data Link, Session, Application, Presentation
- DPhysical, Data Link, Network, Transport, Session, Presentation, Application
- EPresentation, Application, Data Link, Session, Network, Transport, Physical
How the community answered
(31 responses)- A3% (1)
- B3% (1)
- D94% (29)
Why each option
This question tests memorization of the seven OSI model layers in correct order from Layer 1 (Physical) to Layer 7 (Application).
This lists the layers in reverse order from Layer 7 down to Layer 1, not from Layer 1 to Layer 7 as the question requires.
This scrambles the layers by misplacing Transport at Layer 3, Data Link at Layer 4, and Session at Layer 5, which is incorrect.
This places Network at Layer 2 and Data Link at Layer 4, swapping these two layers, and also misorders the upper layers.
The correct bottom-to-top order is Physical (1), Data Link (2), Network (3), Transport (4), Session (5), Presentation (6), Application (7). This ordering reflects how data is encapsulated as it moves down the stack from an application and de-encapsulated as it moves up at the receiving host. A common mnemonic is 'Please Do Not Throw Sausage Pizza Away.'
This order is entirely scrambled with Presentation listed first and Physical listed last, which matches no valid OSI layering.
Concept tested: OSI model layer order and numbering
Source: https://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/50070-osi-layers.html
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