The protocol that was blocked in the lab was TCP.
What is protocol?
A communication protocol is a set of guidelines that enables the transmission of information between two or more entities of the a communications system using any variation of the a physical quantity. The protocol specifies the guidelines, syntax, semantics, synchronisation, and potential methods for error correction. Hardware, software, or even a combination of both can implement protocols. Communication systems exchange various messages using predefined formats. Each message is intended to elicit a specific response from a range of potential responses that have been predetermined for that specific circumstance. Usually, the desired behaviour is independent of the implementation strategy. The parties concerned must agree on communication protocols. A protocol could be turned into a technical standard to reach an agreement.
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