Ports (TCN and UDP)
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In computer networking, a port is a communication endpoint that is associated with a specific process or service on a device. It acts as a channel through which network protocols, such as TCP or UDP, deliver data to the correct application or service running on a device.
Imagine you have a house with multiple rooms, and each room serves a different purpose. In this analogy:
Your house represents a computer or a device connected to a network.
The rooms in your house represent different applications or services running on that device.
The doors of each room represent ports.
Now, let's say you have three rooms in your house:
Room 1: It's a web server that hosts a website.
Room 2: It's an email server that handles incoming and outgoing emails.
Room 3: It's a file server that allows remote file access.
In this scenario, each room/application has its own door/port for communication. These ports are like entry points for data to reach the corresponding applications. Each door/port is assigned a specific number, which is known as a port number.
Here's how it works:
The web server in Room 1 is associated with port number 80 (default port for HTTP).
The email server in Room 2 is associated with port number 25 (default port for SMTP).
The file server in Room 3 is associated with port number 21 (default port for FTP).
When someone wants to access your website, they send a request to your device's IP address (the location of your house) and specify that they want to use port 80 (the door to Room 1). This ensures that the request is directed to the web server/application running on port 80.
Similarly, when someone wants to send you an email, their email client sends the email to your device's IP address, specifying port 25 (the door to Room 2) so that the email server/application can receive and process the email.
In summary, ports act like doors that allow data to enter or leave specific applications or services running on a device. They help in directing data to the correct destination within the device based on the specified port number.
