Syntax and Semantic Testing for protocol testing

Syntax and Semantic Testing: Protocol conformance testing requires testing both the syntax and the semantics (functionality) of the device under test. Semantic tests force the device under test into a certain condition or state. Often the test cannot verify the correct behavior; it must be verified by an operator.
It’s example can be a test for a router to check whether it is maintaining an accurate count of all erroneous incoming packets of a certain type requires a mechanism for generating the erroneous packets, counting them, directing them to the router, assuring they were received by the router, and then reading the actual counter in the router

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