14- In the circuit-switching, the hosts break application-layer messages into packets:

Network forwards packets from one router to the next, across links on path from source to destination

Moves arrived packets from router’s input link to the appropriate router’s output link

Question

14- In the circuit-switching, the hosts break application-layer messages into packets:

Network forwards packets from one router to the next, across links on path from source to destination

Moves arrived packets from router’s input link to the appropriate router’s output link

BlackTom AI · Accepted Answer

Circuit switching reserves an end-to-end dedicated path and resources for the duration of a connection; it does not use per-packet forwarding by routers. Therefore the statement is false.

1) Relevant knowledge points and concepts
- Circuit switching: a dedicated communication path (channel) is established between sender and receiver before data transfer; once established, data flows as a continuous bit stream over that path and intermediate switches simply connect the path segments for the call’s duration.
- Packet switching: hosts break application-layer messages into packets; routers forward individual packets hop-by-hop across links, using store-and-forward and forwarding table lookups.
- Router operation (packet switching): a router receives packets on an input link, examines the packet header, determines the correct outgoing link via its forwarding table, and moves the packet from the input interface to the appropriate output interface.

2) Step-by-step reasoning
- The claim begins “In the circuit-switching, the hosts break application-layer messages into packets.” That describes packet-switching behavior, not circuit switching.
- The following phrases (“Network forwards packets from one router to the next, across links on path from source to destination” and “Moves arrived packets from router’s input link to the appropriate router’s output link”) describe router-based per-packet forwarding, again a hallmark of packet-switched networks.

3) Intermediate steps / clarifications
- Circuit switching: establish circuit → allocate resources → send continuous stream; no per-hop packet forwarding decisions.
- Packet switching: message → segmentation into packets at sender → each packet forwarded hop-by-hop by routers using headers and forwarding tables.

4) Why the correct answer is correct
- Because all parts of the statement describe packet-switching mechanisms, attributing them to circuit switching is incorrect. Circuit-switched networks do not perform host packetization and router-based hop-by-hop forwarding in the way described.

5) Why the other option is incorrect
- “True” would imply that circuit-switching uses packet segmentation and router hop-by-hop forwarding; that contradicts the fundamental definition of circuit switching (dedicated end-to-end channels rather than per-packet routing).

6) Conclusion
- The correct evaluation is False, which matches the provided answer.

14- In the circuit-switching, the hosts break application-layer messages into packets: Network forwards packets from one router to the next, across links on path from source to destination Moves arrived packets from router’s input link to the appropriate router’s output link 判断题

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