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Sounds suspiciously like a school question....hmmmmm....
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Sounds suspiciously like a school question....hmmmmm....

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Why are network protocols needed? How do you decide which protocol is more suitable for a network implementation? 
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Why are network protocols needed? How do you decide which protocol is more suitable for a network implementation? 

Protocols

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.