Question-20)

Process-to-process communication is at:

Question

Question-20)

Process-to-process communication is at:

BlackTom AI · Accepted Answer

Process-to-process communication occurs at the Transport layer because this layer provides the end-to-end logical communication between application processes running on different hosts.

1) Relevant knowledge points and concepts
- Layered models: OSI and TCP/IP partition network functions into layers; the Transport layer sits above the Network (Internet) layer and below the Session/ Application layers.
- Transport layer responsibilities: process addressing (ports), multiplexing/demultiplexing, reliable/ unreliable delivery (e.g., TCP vs UDP), flow control, error detection/correction, and segmentation/reassembly.
- Distinction: host-to-host (network-layer, IP) vs process-to-process (transport-layer, ports/sockets).

2) Step-by-step reasoning
- A “process” is an instance of a running program identified on a host by a port number and a transport protocol.
- The Network layer (IP) delivers packets between host machines but has no mechanism to distinguish which local application should receive the data.
- The Transport layer adds headers containing port numbers; the destination port tells the receiving host which process (application) should receive the payload.
- Multiplexing on the sender side and demultiplexing on the receiver side are functions implemented by the Transport layer to direct data to/from correct processes.

3) Intermediate “steps” (conceptual)
- Application generates data -> Transport layer segments data and adds source/destination ports -> Network layer encapsulates segments into packets and routes between hosts -> Receiving host Network layer strips IP encapsulation -> Transport layer uses destination port to deliver data to the correct process.

4) Why the correct answer is correct
- Only the Transport layer provides addressing and multiplexing that link network deliveries to specific processes via port numbers and protocols like TCP/UDP; therefore it is the layer responsible for process-to-process communication.

5) Why other layers are incorrect (briefly)
- Network layer: provides host-to-host addressing and routing (IP), not process addressing.
- Data Link / Physical layers: handle framing and bit transmission over a single link, not processes.
- Application/Session layers: are endpoints but rely on Transport to carry process-specific data across networks.

Conclusion: Process-to-process communication is at the Transport layer — this matches the provided correct answer, “Transport layer.”

Question-20) Process-to-process communication is at: 单项选择题

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