What is the OSI Model? Detailed Explanation…
What Is the OSI Model
The Open Systems Interconnection (OSI) model describes seven layers that computer systems use to communicate over a network. It was the first standard model for network communications, adopted by all major computer and telecommunication companies in the early 1980s
The modern Internet is not based on OSI, but on the simpler TCP/IP model. However, the OSI 7-layer model is still widely used, as it helps visualize and communicate how networks operate, and helps isolate and troubleshoot networking problems.
Common TCP/IP protocols include the following:
Hypertext Transfer Protocol. HTTP handles the communication between a web server and a web browser.
HTTP Secure. HTTP Secure handles secure communication between a web server and a web browser.
File Transfer Protocol. FTP handles transmission of files between computers.
Domain name system. DNS translates domain names into IP addresses.
Simple mail transfer protocol. SMTP is used for email communications and is responsible for the transmission of emails between mail servers.
User datagram protocols. UDP is a connectionless protocol that offers faster but less dependable data delivery. It’s widely used in real-time applications such as video streaming and online gaming.
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