Question at position 7 The Internet uses ________ technology in order to deliver messages from one computer to another.page switchingframe switchingpacket switchingcircuit switching单项选择题
A
page switching
B
frame switching
C
packet switching
D
circuit switching

Question

Question at position 7 The Internet uses ________ technology in order to deliver messages from one computer to another.page switchingframe switchingpacket switchingcircuit switching

BlackTom AI · Accepted Answer

Packet switching is the core technology used by the Internet because data is broken into independent packets that are routed separately across the network.

1. Relevant knowledge points and concepts
- Packet switching: data is divided into small units (packets) each containing payload and header (destination, sequence info). Routers forward packets independently using store-and-forward. Protocols: IP (network layer) routes packets; TCP/UDP carry data over IP.
- Circuit switching: a dedicated end-to-end path is established for the duration of a session (classical telephone PSTN).
- Page switching: relates to virtual memory (pages moved between RAM and disk), not network transmission.
- Frame switching/frame relay: “frames” are link-layer units; frame relay is a WAN technology but still operates via packet-like switching. The Internet’s global forwarding is packet-based at the IP layer.

2. Step-by-step reasoning
- When you send data on the Internet, the sending host breaks the data into packets (IP datagrams).
- Each packet receives an IP header with source/destination addresses and other control fields.
- Routers examine the destination address and forward each packet to the next hop; packets may take different paths and arrive out of order.
- No dedicated circuit is reserved between endpoints; bandwidth is shared and resources are allocated per packet.

3. Intermediate steps (conceptual, no numeric calculation)
- Data segmentation → packet creation → routing decision at each router → store-and-forward transmission → reassembly at destination (using sequence numbers if needed).

4. Why the correct answer is correct
- The Internet’s fundamental forwarding mechanism is per-packet routing (IP). This allows efficient multiplexing of many flows, robustness to link failures, and scalable routing—hallmarks of packet switching.

5. Why other options are incorrect
- Page switching: unrelated to network transmission; it’s memory management.
- Frame switching: ambiguous; while frames are used at the link layer, the global Internet routing model is packet switching (IP). Frame relay is a WAN service but not the general Internet architecture.
- Circuit switching: requires a dedicated path (not how IP networks operate); inefficient for bursty traffic common on the Internet.

6. Conclusion
The correct choice is packet switching, which matches the provided answer: packet switching.

Question at position 7 The Internet uses ________ technology in order to deliver messages from one computer to another.page switchingframe switchingpacket switchingcircuit switching单项选择题

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