Which layer of the OSI model provides logical end-to-end communication between applications on different hosts?

Question

BlackTom AI · Accepted Answer

The Transport layer is responsible for logical end-to-end communication between applications on different hosts, so the correct choice is d. Transport layer.

1) Relevant knowledge points and concepts
- OSI model layering: Application (7), Presentation (6), Session (5), Transport (4), Network (3), Data Link (2), Physical (1).
- “End-to-end” refers to communication between processes/applications on different hosts, not just between adjacent devices.
- Transport layer functions: segmentation/reassembly, flow control, error detection/recovery, multiplexing/demultiplexing using port numbers, connection establishment/teardown (e.g., TCP), and unreliable datagram delivery (e.g., UDP).

2) Step-by-step reasoning
- The question asks which layer provides logical end-to-end communication between applications on different hosts.
- “Logical end-to-end communication between applications” implies the layer must present application-to-application services (ports, sessions, reliability).
- Transport layer (Layer 4) offers these exact services: it presents logical communication endpoints via port numbers and provides mechanisms (TCP/UDP) that allow applications on different hosts to exchange data reliably or unreliably as required.

3) Calculations / intermediate steps
- No numeric calculations required. The conceptual mapping is: Application ↔ Transport (ports) ↔ Network (IP addresses) ↔ Data Link/Physical.

4) Why the correct answer is correct
- Transport layer maps application data to transport protocol segments, uses port numbers for demultiplexing to correct application, handles end-to-end error control and flow control (TCP), thus implementing logical end-to-end communication between applications across hosts.

5) Why the other options are incorrect
- a. Data Link layer: Provides node-to-node (link) delivery with MAC addresses and frames; not end-to-end between applications.
- b. Presentation layer: Responsible for data representation, encryption, compression and syntax, not for end-to-end transport services.
- c. Network layer: Handles host-to-host routing and IP addressing across networks, but does not provide application-level end-to-end logical channels (no ports/multiplexing).

6) Conclusion
This confirms the correct answer is d. Transport layer, matching the provided answer.

Which layer of the OSI model provides logical end-to-end communication between applications on different hosts?单项选择题

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