CIE IGCSE - Computer Science 
Theory of Computer Science -
Communication and internet technologies

CIE | IGCSE | Computer Science | Theory of Computer Science | Communication and internet technologies | Lesson 04

Data transmission

CIE | IGCSE | Computer Science | Theory of Computer Science | Communication and internet technologies | Lesson 05

Security aspects

CIE | IGCSE | Computer Science | Theory of Computer Science | Communication and internet technologies | Lesson 06

Internet principles of operation

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