[hypnotist]

Everybody(in tech) knows that most of the time certifications are worthless in terms of real technical skill... that being said - it gets you through the door. you will get more interviews if you have something.

Since you mentioned Networking and Security and let's assume you want to work in this field. - I would take Cisco CCNA/CCNP etc.

Disclaimer: it's been a while since I looked into them so do some research which ones are relevant to you.