INTRODUCTION TOTHE ISO-OSI REFERENCE NETWORK MODEL

As previously mentioned, a protocol is a common set of rules that all hosts on a network understand. Protocols are used for the transfer of data from one computer to another. Although multiple protocols may be available on a single network, understanding of a common protocol is necessary for data transfer to take place between two hosts. My favorite analogy for a protocol is the human language. People sitting at one place might be speaking different languages, but for a successful communication between two persons, those two persons must agree on a common language. Similarly, it is possible for one host to understand multiple protocols (just like some human beings can understand multiple languages). ...

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