What is used at the Transport Layer to uniquely identify applications on a host?

Question

Accepted Answer

Port Number - The Transport Layer uses a unique number called a Port Number to identify applications on a host (computer or device).

Every application or service, like a web browser or email client, is assigned a specific port number. This helps the system understand which application should receive the data. For example, HTTP uses port 80 and HTTPS uses port 443.

Port numbers work together with the IP address. While the IP address identifies the device on the network, the port number tells which application on that device the data belongs to.

This system allows multiple applications to run at the same time on the same device without confusion in data delivery.

Conclusion: The correct answer is Port Number. It helps the Transport Layer send data to the right application on a host.

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