Data transmission

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Sample objectives

What this unit covers

• Types and methods of data transmission: Recognize that data is divided into packets for transmission, describe the components of a packet, and explain the packet switching process. A packet consists of a header, payload, and trailer. The header contains the destination address, packet number, and originator's address. Data is segmented into packets that may take different routes, managed by routers. Packets can arrive in a different order, and they are reordered once all packets have been received.
• Types and methods of data transmission: Explain how data is sent between devices using various transmission methods and assess the appropriateness of each method for specific situations. This includes serial, parallel, simplex, half-duplex, and full-duplex methods, along with their respective advantages and disadvantages.
• Methods of error detection: Recognize the importance of verifying data after it has been transmitted and understand the potential causes of errors during this process, such as data loss, gain, or alteration due to interference.
• Methods of error detection: Explain the steps involved in various methods used to detect errors in transmitted data, specifically focusing on parity checks (both odd and even), checksums, and echo checks, including details on parity bytes and blocks.
• Encryption: Recognize the importance and function of encryption in data transmission.
• Encryption: Comprehend the methods of data encryption through symmetric and asymmetric techniques, including the roles of public and private keys in asymmetric encryption.