Transport Layer Data Transmission Modes | Generated by AI
Question: What is the data transmission service mode of the transport layer between two transport entities?
Answer:
The correct answer is B.
Explanation: The primary task of the transport layer is to provide reliable or unreliable data transfer services between two end systems (transport entities).
- Full-Duplex Service: In most standard networking scenarios (such as TCP connections), the transport layer operates in full-duplex mode. This means both entities can send and receive user data and control data simultaneously. This is the default and most common configuration.
- Half-Duplex Service: While less common in modern general-purpose protocols like TCP, there are specific contexts or specialized protocols where communication might be restricted to half-duplex (data flows in only one direction at a time). Therefore, stating that it is “generally full-duplex, but can be half-duplex in individual cases” accurately reflects the flexibility and typical operation of the layer.
Options A and C are incorrect because they use absolute terms (“only”) which do not account for the variety of protocol implementations and specific use cases. Option D is incorrect because Option B provides a valid description.
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