📡 Topic 2

Data Transmission

Discover how data is divided into packets, sent between devices, checked for errors and protected through encryption.

Follow the journey of the data. First understand the packet, then see how it travels, how errors are detected and how information is protected.

Choose a lesson

Follow the sequence or jump directly to the transmission concept you need.

2.1

Data Packet Structure

Understand why data is divided into packets and what information is stored in each packet header.

FoundationOpen lesson
2.2

Packet Switching

See how packets can take different routes through a network before being reordered at their destination.

Network journeyOpen lesson
2.3A

Serial and Parallel Transmission

Compare sending data one bit at a time with sending several bits simultaneously.

Transmission methodOpen lesson
2.3B

Simplex, Half-Duplex and Full-Duplex

Understand whether communication travels in one direction, alternates direction or occurs both ways at once.

Communication modeOpen lesson
2.4

USB

Explore how USB connects devices and why it is a widely used method of serial data transmission.

ConnectivityOpen lesson
2.5A

Parity Error Detection

Learn how parity bits can reveal whether a transmitted group of bits may contain an error.

Error detectionOpen lesson
2.5B

Check Sum, Echo Check, ARQ and Check Digit

Compare several methods used to detect errors and request that damaged data is sent again.

Reliable transferOpen lesson
2.6

Encryption

Understand how readable plaintext is transformed into ciphertext to protect data during transmission.

Final lessonOpen lesson
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