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Date November 2018 Marks available 4 Reference code 18N.1.SL.TZ0.6
Level SL Paper 1 Time zone no time zone
Command term Describe Question number 6 Adapted from N/A

Question

Describe how data is transmitted by packet switching.

Markscheme

Award [4 max].

Packet switching entails data being separated into specially formatted units (packets);
Each packet contains data and information such as packet number, address that identifies the sending computer and intended recipient, etc.;
Packets are routed from source to destination using (different) network switches and routers;
Using these addresses, network switches and routers determine how best to transfer the packet on the path to its destination;
Packets are reassembled at the destination (using packet numbers);
If any of packets is missing it should be retransmitted;

Examiners report

[N/A]

Syllabus sections

Topic 3: Networks » 3.1 Networks
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Topic 3: Networks

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