How does X close a TCP connection... it depends on the operating system in question. What cipher does my browser use when talking to X website... it depends on what ciphers are supported/available and how the client/server are configured. Which router do these packets go through... it depends. Is my password secure... it depends on the string you chose, the hash type used to store the password and who the attacker is and what their resources and time frames are.
There is hardly anything absolute in technology/software. And, people who want an absolute answer are only indicating that they do not understand the fundamental complexity issues that we deal with as technologists.