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WalesComputer ScienceQuick questions
Unit 3 Programming and System Development
Quick questions on Data transmission and networks: protocols, layers and security - WJEC A-Level Computer Science
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is packet switching revisited?Show answer
In packet switching, a message is divided into packets, each carrying source and destination addresses and a sequence number. Packets are routed independently across the network, possibly by different routes, and reassembled in order at the destination. This shares links efficiently and reroutes around failures, giving resilience.
What is q1?Show answer
State one reason serial transmission is preferred over parallel for long distances. [1 mark]
What is q2?Show answer
State the network device used to forward packets between two different networks. [1 mark]
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