|Actually, you'll want to buy a SOHO Router (SOHO = small office/home office).|
A switch could be used but would require you to have one external IP address per computer being connected. A SOHO Router allows multiple computers to connect through a single IP using NAT. Also, the router would provide you with some intrusion protection because they have a firewall built in.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.