Explain briefly how a router uses TCP port numbers to differentiate internet traffic.
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Answer:
The term “ports” or “network ports” usually means the physical interfaces or ports on a device, such as a router, switch, server or even a personal computer. However, even though these are the physical ports, there are also logical ports within an operating system or a device. You may ask yourself, how does a physical port exist within a computer, server or a network appliance such as a router or switch? Here, we are going to further breakdown the concepts of these logical ports or what is known as network ports.
To get started, we will use a simple analogy to help you understand the fundamentals of logical ports on a system. Let’s imagine you own an organization, at the headquarters location, is a single building with many floors and at the center of the building are the elevators for easy access to the upper floors. Each floor is occupied by a unique department and its respective staff members of the organization. Each day, the employees use the elevators which transport the staff to his/her relevant department and back. Let’s imagine the physical building is a computing system such as a server, there are doors at each relevant department and the employees of the organization are different types of network traffic entering and leaving the system on a daily basis.
Now let’s put all the piece together and get everything working in harmony. Each time an employee (network traffic) enters the building (operating system), he/she takes the elevator (Transport Layer) which delivers the employee to their respective doorway (logical port) at their department (service/protocol at the Application Layer). From this analogy, you may have realized each type of network traffic (employee) enters their relevant department using a doorway, this doorway is a logical port existing within the operating system (building) and won’t be visible to any entity outside of the system.
Answer:
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Explanation:
The term “ports” or “network ports” usually means the physical interfaces or ports on a device, such as a router, switch, server or even a personal computer. However, even though these are the physical ports, there are also logical ports within an operating system or a device.