IGCSE Computer Science · Chapter 2
Data transmission
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InteractiveTypes and Methods of Data Transmission2.1 Packets and packet switching, serial and parallel, simplex and duplex, USB, with a packet builder, network lab and exam questions.Open →
InteractiveMethods of Error Detection2.2 Parity checks and blocks, checksum, echo check, check digits and ARQ, with animations, labs and exam questions.Open →
InteractiveSymmetric and Asymmetric Encryption2.3 Plaintext and ciphertext, shared keys, public and private keys, a cipher lab, cracking-time and key-count labs, and exam questions.Open →
Extra activities that deepen understanding or give more support. Shown in coursebook order.
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InteractiveErrors, Detection and Solutions ComparedCompare types of error (corrupted, lost, gained, skew, data entry), the checks that find them and the ways they are fixed, with an error-by-check grid, a damage lab, animations and exam questions.Open →
InteractiveCyclic Redundancy ChecksCRCs on data packets: count the 1-bits in the payload, store the total as hex in the trailer, recount and compare. Animations, labs, drills and exam questions.Open →
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