Question

How can you test connectivity to an SMTP server at multiple layers of OSI model?

Answer 1

Answer:

1) telnet to port 80/443 for layer 7 connectivity

2) use netcat

Explanation:

Layer 1 connectivity is established by link light. Layer 2 connectivity is establish by checking if link protocol shows as up

Answer 2

We can test connectivity to an SMTP server at multiple layers of OSI model by following protocol rules. SMTP stands for Simple Mail Transfer Protocol and it is an application layer protocol. When we send an email application, that message is sent to the presentation layer, using SMTP. Each layer in OSI takes data from an adjacent layer and sends processed data to the next layer.

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