The data link layer is in charge of defining a standard method of interpreting these signals so that network devices can communicate, whereas the physical layer is all about cables, connectors, and sending signals.
TCP is important because it establishes the standards and recommended procedures for data transfer over the internet.
It serves as the basis for the internet as we know it today and guarantees that data transfer occurs consistently regardless of the location, technology, or software used.
Therefore, The simple mail transfer protocol (SMTP), which describes how messages are transferred between email servers, defines this process.
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