IT professional must know the OSI Model

Knowing the OSI Model is no longer only for networking folks. In today’s interconnected world, it’s becoming essential knowledge for everyone in the tech industry. The Open Systems Interconnection (OSI) model is a conceptual framework for understanding how computers communicate with each other. let’s think of the OSI model as a postal system for the internet. In this system, we have seven steps (or layers) that information takes from one computer to another. Each layer has a specific job and these jobs need to be done in a certain order, like when you send a letter through the post office.

1. 𝗣𝗵𝘆𝘀𝗶𝗰𝗮𝗹 𝗟𝗮𝘆𝗲𝗿 (𝗟𝗮𝘆𝗲𝗿 𝟭) 🚚: Like a mail truck, this layer is responsible for the actual delivery of data. In a computer, it’s the physical parts like the cables and wires 🔌 that carry the data from one computer to another.

2. 𝗗𝗮𝘁𝗮 𝗟𝗶𝗻𝗸 𝗟𝗮𝘆𝗲𝗿 (𝗟𝗮𝘆𝗲𝗿 𝟮) 🏷️: This layer is like the sorting process at the post office. It prepares the data for transport on the physical layer by packaging it up 📦 and adding a delivery address 🏠.

3. 𝗡𝗲𝘁𝘄𝗼𝗿𝗸 𝗟𝗮𝘆𝗲𝗿 (𝗟𝗮𝘆𝗲𝗿 𝟯) 🗺️: This is like the system the post office uses to determine the best route for the letter. This layer finds the best path 🛤️ for the data to get to its destination.

4. 𝗧𝗿𝗮𝗻𝘀𝗽𝗼𝗿𝘁 𝗟𝗮𝘆𝗲𝗿 (𝗟𝗮𝘆𝗲𝗿 𝟰) 🛡️: Think of it as a security check. It ensures that the data arrives safely without any errors, like making sure that your letter isn’t damaged when it arrives.

5. 𝗦𝗲𝘀𝘀𝗶𝗼𝗻 𝗟𝗮𝘆𝗲𝗿 (𝗟𝗮𝘆𝗲𝗿 𝟱) 🤝: This layer is like making sure the mail is delivered to the correct mailbox 📬. It establishes, maintains, and ends communication with the receiving device.

6. 𝗣𝗿𝗲𝘀𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻 𝗟𝗮𝘆𝗲𝗿 (𝗟𝗮𝘆𝗲𝗿 𝟲) 🧑‍💻: This layer is like the person who opens the letter and translates it into a language you understand. It changes the data into a format that the receiving computer can understand.

7. 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗟𝗮𝘆𝗲𝗿 (𝗟𝗮𝘆𝗲𝗿 𝟳) 💌: This is like the contents of the letter itself – the information you want to communicate. This is the data that the user interacts with, like your email 📧 or web browser 🌐.

𝗧𝗖𝗣/𝗜𝗣 is another model used for networking and it stands for “Transmission Control Protocol/Internet Protocol.”

1. 𝗡𝗲𝘁𝘄𝗼𝗿𝗸 𝗜𝗻𝘁𝗲𝗿𝗳𝗮𝗰𝗲 (𝗟𝗮𝘆𝗲𝗿 𝟭) 🚚: This is a combination of OSI’s Physical and Data Link layers.

2. 𝗜𝗻𝘁𝗲𝗿𝗻𝗲𝘁 (𝗟𝗮𝘆𝗲𝗿 𝟮) 🗺️: This is similar to OSI’s Network layer.

3. 𝗧𝗿𝗮𝗻𝘀𝗽𝗼𝗿𝘁 (𝗟𝗮𝘆𝗲𝗿 𝟯) 🛡️: This combines the functions of OSI’s Transport and Session layers.

4. 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 (𝗟𝗮𝘆𝗲𝗿 𝟰) 💌: This layer combines the OSI’s Presentation and Application layers.

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IT专业人士必须了解OSI模型

了解OSI模型不再只是网络人员的专利。在当今互联的世界中，它正在成为科技行业每个人的必备知识。开放系统互连(OSI)模型是用于理解计算机如何相互通信的概念框架。让我们将OSI模型视为互联网的邮政系统。在这个系统中，信息从一台计算机传输到另一台计算机有七个步骤(或层)。每一层都有特定的工作，这些工作需要按一定的顺序完成，就像您通过邮局寄信一样。

1. 物理层(1层)🚚：就像邮车一样，这一层负责数据的实际传递。在计算机中，电缆和电线等物理部件将数据从一台计算机传输到另一台计算机。

2. 数据链路层(2层)🏷️：这一层就像邮局的分拣过程。它通过打包📦并添加交付地址🏠来准备物理层上传输的数据。

3. 网络层(3层)🗺️：这就像邮局用来确定信件最佳路线的系统。该层找到数据到达目的地的最佳路径🛤️。

4. 传输层(4层)🛡️：将其视为安全检查。它确保数据安全到达而不会出现任何错误，例如确保您的信件在到达时没有损坏。

5. 会话层(5层)🤝：这一层就像确保邮件被投递到正确的邮箱📬。它建立、维持和结束与接收设备的通信。

6. 表现层(6层)🧑‍💻：这一层就像打开信件的人，将其翻译成您能理解的语言。它将数据更改为接收计算机可以理解的格式。

7. 应用层(7层)💌：这就像信件本身的内容 – —你想要传达的信息。这是用户与之交互的数据，例如您的电子邮件📧或网络浏览器🌐。

𝗧𝗖𝗣/𝗜𝗣 是另一种用于网络的模型，它代表“传输控制协议/互联网协议”。

1. 网络接口(1层)🚚：这是OSI物理层和数据链路层的组合。

2. 互联网(2层)🗺️：这与OSI的网络层类似。

3. 传输(3层)🛡️：它结合OSI传输层和会话层的功能。

4. 应用(4层) 💌：该层结合OSI的表示层和应用层。

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