There is much more to creating a network than /etc/fstab. The fstab can be used to mount existing network shares to a computer, but does not come into play in creating and configuring those shares.
Certainly you can network your Linux machines, but, before you do, it might be a good idea to do a web search for "configure linux network" and read some tutorials and HOWTOs to get the bigger picture.
The Arch Wiki would be a great place to start:
https://wiki.archlinux.org/index.php..._configuration