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Difficulty: MediumOSI Model Layers and Functions

A network technician is troubleshooting a custom client-server application. Packet analysis confirms that IP routing and TCP port assignments are functioning properly. However, the receiving system fails to display text correctly because it cannot translate the incoming ASCII-encoded payload into the required UTF-8 format. At which layer of the OSI model does this data syntax translation occur?

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

Answer

Presentation Layer
The correct answer identifies the Presentation Layer (Layer 6). This layer serves as a translator for the network, handling tasks such as character encoding conversion (e.g., ASCII to Unicode/UTF-8), data compression, and data encryption/decryption so that applications can correctly interpret the payload.

Step-by-Step Solution

1
Analyze the problem scenario to identify the specific failure.
The issue involves translating character encoding formats from ASCII to UTF-8.
Identifying the functional requirement (character translation/formatting) isolates the responsible network model layer.
2
Map data syntax translation to its corresponding OSI model layer.
Layer 6 (Presentation Layer) is responsible for syntax conversion, data formatting, encryption, and compression.
The Presentation Layer ensures that data sent from an application on one host can be parsed and understood by the application on another host.

Key Concept

OSI Model Presentation Layer Functions
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Topics

OSI Model Layers and Functions

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