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Difficulty: MediumOSI Model Layers and Functions

A network administrator is troubleshooting an enterprise client application that fails to display incoming data correctly. Packet captures reveal that while reliable transport connections are successfully established, the application cannot decode the incoming payload due to an unnegotiated character encoding scheme and an incompatible compression format. Which OSI reference model layer is directly responsible for syntax translation, data formatting, and payload encryption?

  1. Presentation LayerAnswer
  2. B
    Session Layer
  3. C
    Application Layer
  4. D
    Transport Layer

Answer

Presentation Layer
The Presentation Layer (Layer 6) acts as a translator for network data. It ensures that application-layer data sent by one system can be understood by the application layer of another system by handling syntax formatting, character set translation (such as ASCII or Unicode), compression, and encryption.

Step-by-Step Solution

1
Analyze the symptoms presented in the scenario.
Transport sessions are operating properly, but data decoding fails due to character encoding and payload compression mismatches.
This isolates the issue to data representation and translation rather than connection management or physical delivery.
2
Map the required functions (data formatting, character encoding, compression, encryption) to the OSI model.
These responsibilities belong to Layer 6.
The Presentation Layer (Layer 6) standardizes data formats and translates syntax between the Application Layer and lower networking layers.

Key Concept

OSI Layer 6 (Presentation Layer) Functions
Estimated Time:1m 0s
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Topics

OSI Model Layers and Functions

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