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What is open and close protocol? What is the difference?

What is open and close protocol? What is the difference?
An open protocol allows vendors' equipment to interoperate without the need for a proprietary interface or gateway. They talk the same language and no translation is needed. A closed protocol is one that is proprietary and not open to communication other products without an interface or gateway (such as SNA).
This was first published in October 2003

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