Multiplexing the data of diverse application over a common channel can be a good thing.
a USB hub
One way to add USB ports to a computer you need a USB expansion card that you add to the motherboard. The card usually has multiple USB ports built into them.
You need to edit the windows firewall settings manually.
Get a splitter for you cable, or buy a dock with multiple ports.
False
no, usually there are only two ports for sound.
etherchannel
Connect the broadband connection to a router, and connect the router ports to the individual systems. If necessary, extend the number of ports on the router by attaching a switch to one of the router ports and attaching multiple clients to the switch.
parallel
There are multiple and major ports between Alexandria, Egypt on the Mediterranean and London, England. Major ports of Continental Europe include Rotterdam. Additionally England has major naval and commercial access in Portsmouth.
Most modern laptops lack any sort of "legacy" ports such as serial ports, let alone them having two. Some older laptops did have multiple serial ports, but there's little point in recommending one because there's no guarantee you could find one. There are options for adding serial ports to a laptop, such as a USB to serial adapter, or a PC card with additional serial ports.
The difference between an ethernet bridge and a switch is that the bridge only has two ports, while the switch has multiple ports. When there is a lot of traffic going through the ports, the bridge traffic may get tied up or crash often because there are only 2 ports for information to travel back and forth.