You can go straight to Net+, A+ might be useful if you plan on going into some general trouble shooting of operating systems, pc hardware, and other general electronics, phones, printers, etc. Or if you don't know anything about computers or IT in general.
(nothing you can't brush up on in a week if your job really required it)

If you know how to access the command prompt you can just go straight into Net+
Net+ is the foundation of network environments.

I'm jumping straight into Net+ since I've grown up around computers all my life, and If i had a job that required me to do some general PC software related stuff, I could learn it on the spot or in a day or two of studying whatever it was they needed.