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Difficulty: MediumOSI Model Layers and Functions

A network engineer is reviewing a protocol analyzer capture during an active client-server session. The log shows explicit control checkpoints being inserted into the data stream to allow recovery and resume capabilities, as well as managing dialog control to regulate which side can transmit. Which OSI model layer is primarily responsible for managing these session synchronization points and dialog modes?

  1. Session layerAnswer
  2. B
    Presentation layer
  3. C
    Transport layer
  4. D
    Data Link layer

Answer

Session layer
The correct answer is the Session layer because Layer 5 of the OSI model is explicitly designed to handle session setup, maintenance, tear-down, dialog control (regulating which host sends when), and insertion of synchronization checkpoints to allow recovery during long data transmissions.

Step-by-Step Solution

1
Analyze the operational requirements described in the stem.
Identified key requirements: managing dialog modes (simplex, half-duplex, full-duplex) and inserting synchronization checkpoints into communication streams.
Synchronization checkpoints and dialog control are functions dedicated to managing logical sessions between end systems.
2
Map the identified functions to the appropriate OSI model layer.
Session Layer (Layer 5) directly governs dialog control and session checkpointing.
Layer 5 establishes, manages, and terminates connections between applications at each end.

Key Concept

OSI Layer 5 (Session Layer) Functions
Estimated Time:1m 15s
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Topics

OSI Model Layers and Functions

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