If you understand how TV used to be (before streaming), a network scan is more like you are trying to watch a program but your annoying brother has the remote a

If you understand how TV used to be (before streaming), a network scan is more like you are trying to watch a program but your annoying brother has the remote and periodically cycles through all the channels to see if there is something more interesting to watch. He often does it during a commercial break but sometimes does not get back before the break ends and sometimes he just does it in the middle of a part of your program that he doesn't understand or thinks is boring.