Which term describes the address through which application traffic originates, typically assigned randomly?

Which term describes the address through which application traffic originates, typically assigned randomly?

• A. Source port
• B. Destination port
• C. IP address
• D. Subnet mask

Answer: (A)

The main idea is how transport-layer addressing identifies the sending process. When an application sends traffic, the operating system assigns a source port for that flow, usually from an ephemeral range and often chosen randomly. This random, temporary port number allows multiple outbound connections from the same host to be distinguished and for responses to be routed back to the correct application. The destination port is a fixed value on the receiving end (the service you’re contacting), the IP address is the host’s address, and the subnet mask is a network-addressing tool, not a per-connection identifier. So the term describing the address the application traffic originates from is the source port.

The main idea is how transport-layer addressing identifies the sending process. When an application sends traffic, the operating system assigns a source port for that flow, usually from an ephemeral range and often chosen randomly. This random, temporary port number allows multiple outbound connections from the same host to be distinguished and for responses to be routed back to the correct application. The destination port is a fixed value on the receiving end (the service you’re contacting), the IP address is the host’s address, and the subnet mask is a network-addressing tool, not a per-connection identifier. So the term describing the address the application traffic originates from is the source port.