Answer: With the tracking via source ports.
Explanation:
Hi, each application has a unique source port number randomly generated, it allows the pc to track the data flow.
Because of this a pc can send multiple HTTP service requests to a web server at the same time, and these requests can be tracked based on the source ports.
Feel free to ask for more if needed or if you did not understand something.
Answer to number two is b, 3 is b, those are the ones i know
Search engines. (I'm Misty btw if you want to know)
