What are Functions of Protocol?

Maintaining session state

Protocols typically implement mechanism to create new connections and terminate existing connections.

Identifying nodes through addressing

Data must be transmitted to the correct node on a network. Some protocols implement an addressing mechanism to identify specific nodes or groups of nodes.

Controlling flow

The amount of data transferred across a network is limited. Protocols can implement ways of managing data flow to increase throughput and reduce latency.

Guaranteeing the order of transmitted data

Many networks do not guarantee that the order in which the data is sent will match the order in which it’s received. A protocol can reorder the data to ensure it’s delivered in the correct order.

Detecting and correcting errors

Many networks are not 100 percent reliable; data can become corrupted. It’s important to detect corruption and, ideally, correct it.

Formatting and encoding data

Data isn’t always in a format suitable for transmitting on the network. A protocol can specify ways of encoding data, such as encoding English text into binary values.

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