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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).

Cisco Data Center Networking Technologies

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)
  • A
    3% (1)
  • B
    3% (1)
  • D
    94% (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).

AApplication, Presentation, Session, Transport, Network, Data Link, Physical

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.

BApplication, Presentation, Transport, Data Link, Session, Physical, Network

This scrambles the layers by misplacing Transport at Layer 3, Data Link at Layer 4, and Session at Layer 5, which is incorrect.

CPhysical, Network, Transport, Data Link, Session, Application, Presentation

This places Network at Layer 2 and Data Link at Layer 4, swapping these two layers, and also misorders the upper layers.

DPhysical, Data Link, Network, Transport, Session, Presentation, ApplicationCorrect

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.'

EPresentation, Application, Data Link, Session, Network, Transport, Physical

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

Topics

#OSI model#layer order#networking fundamentals

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