I recently found how valuable networks are. Whether it is from friends, a common job, a person that owns a business, a professor, or in high education places like UC Berkeley/UCLA, you'd want them because those network may help you towards your endeavors faster than a degree or good work ethics can. This is especially true when both parties see that there is some mutual benefits in the process (maybe you'll be their future place to go to when you climb up.)
The only networks that aren't beneficial are the ones that you may seemingly think will not benefit you in the long run (the person is detrimental to your job career[maybe is a bad person]) Other than that, there can be little harm done when you network correctly.
I think, in a few years, I may be in a higher position than I'll be currently (still considering myself as a student.) The trick is to not be your introverted self.