Communication Protocols

Module 5.

Why Protocols Matter

Computers use rules (protocols) to communicate. In a wired or wireless environment, a local network is defined as an area where all hosts must "speak the same language" e.g. share a common protocol. Network protocols define many aspects of communication, these are listed below:

Protocol Characteristic
Description

Message Format

Specific format/structure must be used. Format depends on type of message and channel used.

Message Size

Rules covering message size are very strict and can vary based on channel. Long messages may need to be broken into smaller pieces.

Timing

Determines the speed at which bits are transmitted across the network.

Encoding

Each bit is encoded depending on the media it is transmitted on, the destination receives and decodes the signals to interpret the message.

Encapsulation

Each message includes a header that contains addressing information, this is the process of adding the info to the pieces that make up the message.

Message Pattern

Some messages require an acknowledgement before the next can be sent.

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