2.2 Protocols

1.	A Protocol a sequence of rules that governs the communications between devices on a network
2.	A set of protocols that work together to ensure successful network communication is called
	protocol suite.
3.	Protocols define the following:

		The syntax of the message: it concerns the format of data.
		The syntax of the message: it concerns the meaning of the message, how to control it for
		coordination and error handling.
		The timing of the message: it concerns when the message should be send? And how
		fast it can be sent?

4.	Protocols can be divided into two types.

	a)	connection-oriented: a logical connection is first established between devices prior to
		data being sent.

e.g.. FTP (in the next chapter).

2.2 Protocols

b)

connectionless: data is just sent without a connection being created.

e.g. DNS (in the next chapter).

connection-oriented

connectionless

must establish connection between devices before data transfer bi-directional information can be resend if there is an error in the destination higher overhead

no need uni-directional impossible less