The SMTP protocol operates at OSI Level:

The correct answer is A. 7. SMTP (Simple Mail Transfer Protocol) is an application-layer protocol that operates at OSI Layer 7. It is important not to confuse OSI layer numbers with port numbers: SMTP uses TCP port 25, and Telnet uses TCP port 23-these are ports, not OSI layers. OSI Layer 3 is the Network…

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SMTP (Simple Mail Transfer Protocol) is an application-layer protocol that operates at OSI Layer 7. It is important not to confuse OSI layer numbers with port numbers: SMTP uses TCP port 25, and Telnet uses TCP port 23-these are ports, not OSI layers. OSI Layer 3 is the Network Layer (used by IP and routers). OSI Layer 7 (Application Layer) is where user-facing protocols like SMTP, HTTP, FTP, and DNS operate.

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#OSI Model#SMTP#Network Protocols#Application Layer

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