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Difficulty: MediumOSI Model Layers and Functions

A network administrator is reviewing system protocol definitions to clarify layer responsibilities within the OSI model. Which of the following functions specifically operate at Layer 5 (the Session Layer)? (Select TWO.)

  1. Establishing, maintaining, and gracefully terminating communication sessions between applications on distinct hostsAnswer
  2. Controlling session dialogue modes (such as simplex, half-duplex, or full-duplex) and inserting synchronization checkpointsAnswer
  3. C
    Encrypting, compressing, and reformatting application data structures for presentation to the recipient host
  4. D
    Segmenting data streams, providing flow control, and managing end-to-end reliability via port numbers

Answer

The Session Layer (Layer 5) is responsible for establishing, managing, and terminating communication sessions between application entities, as well as managing dialogue control and inserting checkpoints into data streams.
Layer 5 (Session Layer) is dedicated to managing communication sessions between applications. Its primary duties include session setup, maintenance, and teardown, as well as dialogue control (duplex management) and checkpointing for session recovery.

Step-by-Step Solution

1
Analyze the core responsibilities of OSI Layer 5 (Session Layer).
Layer 5 coordinates the exchange of information between application sessions, managing session setup, teardown, dialogue mode, and synchronization checkpoints.
Differentiating Layer 5 from adjacent layers requires matching session control functions specifically to Layer 5.
2
Evaluate each provided option against OSI layer definitions.
Session establishment/termination and dialogue control belong to Layer 5. Encryption and data formatting belong to Layer 6. Segmentation and port-based flow control belong to Layer 4.
This confirms which options describe Layer 5 functions while identifying the mismapped adjacent layer functions.

Key Concept

OSI Layer 5 (Session Layer) Functions
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Topics

OSI Model Layers and Functions

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