At which OSI layer is a source port number added to a PDU during the encapsulation process?
- transport layer
- application layer
- network layer
- presentation layer
| Explanation & Hint:
A source port number is added to a Protocol Data Unit (PDU) during the encapsulation process at the “transport layer,” which is also known as OSI Layer 4. Port numbers are used to identify specific processes or services on a device, and they are utilized at the transport layer to ensure that data is delivered to the correct application or service on the receiving end |