Which of the following is not a characteristic of packet switching?

Question

BlackTom AI · Accepted Answer

Unlike circuit switching, packet switching does not require dedicated point-to-point circuits; instead, data is divided into packets that share network resources dynamically.

1. Relevant knowledge points and concepts
- Packet switching: data is segmented into packets, each with addressing and control information (sequence numbers, checksums). Packets are forwarded independently by routers/switches and can traverse different paths. Reassembly occurs at the destination.
- Circuit switching: a dedicated end-to-end path (point-to-point circuit) is reserved for the duration of a session (e.g., traditional telephone networks).
- Error checking: packets commonly include checksums or CRC fields for detecting transmission errors; higher-layer protocols use sequence numbers for ordering and retransmission.

2. Step-by-step reasoning
- Compare each option to the defining features of packet switching.
- Option "Packets travel independently of each other": True — in datagram packet switching each packet is routed independently.
- Option "Packets are routed through many different paths": True — multiple routes are possible depending on network state and routing decisions.
- Option "Packet switching requires point-to-point circuits": This contradicts the core definition: packet switching multiplexes packets over shared links without reserving an exclusive circuit.
- Option "Packets include data for checking transmission errors": True — packets typically contain error-checking fields (e.g., checksums/CRC).
- Option "Packets are reassembled into the original message when they reach their destinations": True — sequence numbers and reassembly at the destination recreate the original message.

3. Intermediate steps / evidence
- Example: On the Internet (packet-switched), multiple TCP segments (packets) from the same connection may take different routes; routers buffer and forward packets; TCP uses sequence numbers and checksums to reorder and validate data before delivering to the application.
- Circuit-switched example: A telephone call reserves a dedicated path; this is not how IP networks operate.

4. Why the correct answer is correct
- The statement "Packet switching requires point-to-point circuits" describes circuit switching, not packet switching. Packet switching specifically avoids dedicated circuits, using statistical multiplexing across shared links.

5. Why other options are incorrect
- They each state standard packet-switching behaviors: independent packet travel (true), multiple routing paths (true), error-checking fields in packets (true), and reassembly at destination (true). Hence they are not the correct choice.

6. Conclusion
The option "Packet switching requires point-to-point circuits." is incorrect for packet switching and is therefore the correct answer to the question. This matches the provided answer.

Which of the following is not a characteristic of packet switching? 单项选择题

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