1a. If cell A1 equals 1, the function returns Bad. 1b. If cell A1 equals 2, the function returns Good. 1c. If cell A1 equals 3, the function returns Excellent. 1d. If cell A1 equals another value, the function returns No Valid Score. Here's another example. 2a.
In information technology, a protocol is the special set of rules that end points in a telecommunication connection use when they communicate. Protocols specify interactions between the communicating entities. Download this free guide.
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).