Which one is the bottom layer of the OSI model
Correct answer: B. Physical
- A. Presentation
- B. Physical
- C. Session
- D. Application
Explanation
The physical layer is responsible for the physical transmission of data bits across a network. It defines the characteristics of the transmission medium, such as the type of cable, the signal strength, and the data rate. The physical layer does not concern itself with the meaning of the data or how it is formatted
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Networking covers LAN, MAN, WAN and wireless networks, network topologies, transmission media, devices such as switches, routers and modems, and the OSI and TCP/IP models. Internet concepts include IP addresses, DNS, URLs, web browsers, email, protocols such as HTTP, HTTPS, FTP and SMTP, and basic network security.
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