3.1-2 Transport-layer functionality. True or False: The transport layer provides for host-to-host delivery service?单项选择题
A
False
B
True

Question

3.1-2 Transport-layer functionality. True or False: The transport layer provides for host-to-host delivery service?

BlackTom AI · Accepted Answer

The transport layer provides process-to-process (end-to-end) delivery, not host-to-host delivery.

1) Relevant knowledge points and concepts
- Layered model roles: the network layer (Internet layer in TCP/IP) is responsible for host-to-host packet delivery and forwarding across networks (addresses: IP addresses). The transport layer (TCP/UDP) sits above the network layer and provides end-to-end, process-to-process services using port numbers, providing multiplexing/demultiplexing, reliable delivery (TCP), flow control, and congestion control.
- Terminology: “host-to-host” typically refers to delivering a packet from one host machine to another (network layer). “Process-to-process” or “end-to-end” emphasizes delivering data to the correct application on the destination host (transport layer).

2) Step-by-step reasoning
- Identify the service named in the statement: host-to-host delivery.
- Map that service to the correct layer: host-to-host delivery is provided by the network layer (IP), which routes packets between hosts.
- Determine what the transport layer provides: transport takes data from an application, segments it, attaches port numbers, and relies on the network layer to move those segments between hosts. On arrival, transport uses the destination port to deliver the data to the correct process.

3) Calculations
- None required for this conceptual question.

4) Why the correct answer is correct
- The transport layer’s defining feature is process-to-process (end-to-end) delivery using ports and connection management (e.g., TCP), not the routing and host addressing functions used to send packets between hosts. Therefore saying the transport layer provides host-to-host delivery is inaccurate.

5) Why the other option (True) is incorrect
- Marking True conflates network-layer responsibility (host-to-host forwarding and addressing) with transport-layer functionality. While transport depends on host-to-host services beneath it, it does not itself perform host-to-host routing.

6) Conclusion
- Therefore the correct answer is False, matching the provided answer.

3.1-2 Transport-layer functionality. True or False: The transport layer provides for host-to-host delivery service?单项选择题

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