TAILIEUCHUNG - Protocols, Services, and Applications

Protocols, Services, and Applications As mentioned, TCP/IP provides a mechanism to allow systems to communicate with each other across a network. | Protocols Services and Applications As mentioned TCP IP provides a mechanism to allow systems to communicate with each other across a network. If we refer back to our language analogy most spoken languages have certain rules that define how the communications occurs. By adhering to these rules one is then able to understand and comprehend what is being communicated. TCP IP follows a similar process to define how the communications will occur through the use of protocols services and applications. You cannot just start throwing words together in any order that you feel like and expect people to understand what you are saying. You have to follow certain rules that are understood by all parties involved for them to understand what you are saying. Network communications is no different. Although spoken languages have rules such as sentence structure and noun and verb usage to define how the communications occurs network communication has protocols. The easiest way to think of a protocol is that it is merely a set of rules that defines how something occurs. So much like how using a verb denotes an expression of existence action or occurrence a network protocol defines how the method of communication will occur such as how TCP defines a mechanism for connection-oriented communications. Protocols may be an open protocol such as TCP UDP or IP which means that the protocol is not owned by anyone in particular and can be used by anyone that wants to use the protocol or they can be closed protocols such as Cisco Discovery Protocol CDP which means that the protocol can only be used by licensed or authorized entities. In general open protocols are used to facilitate most vendor-neutral communications processes closed protocols are used by vendors to provide vendor-specific communications processes. Whereas protocols define how something occurs services typically define what is being done. The objective of a service is to produce some function or data of value and substance. .

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