When you must deal with an attic space because you can't run the cable by simply pushing up the ceiling tiles, there a few things to consider.
This video is short and gives you a few tips to consider when running Cat5e or Cat6 cable in a attic.
Plus, a few important saftey tips about how and where to walk in the attic. The attic can be a very hazardous environment. Understanding where to put your feet is very important.