Question

What is the 1st and last layer of OSI model?​

Answer 1

Answer:

Layer 1 of The OSI Model: Physical Layer defines electrical and physical specifications for devices. The physical layer defines the relationship between a device and a transmission medium, such as a copper or optical cable.

Explanation:

We'll describe OSI layers “top down” from the application layer that directly serves the end user, down to the physical layer. The application layer is used by end-user software such as web browsers and email clients.

Answer 2

Answer:

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Explanation:

The top-most layer of the Seven Layers of Open Systems Interconnection (OSI) Model is the Application Layer and the bottom-most layer of the Seven Layers of Open Systems Interconnection (OSI) Model is Physical Layer