Switches reduce the problems associated with having 1 collision domain. They allow for faster network speeds and allow for advanced network management.
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The answer is yes. If you need more information, please be more specific on what it is you're trying to do.
Yes. Generally you plug your internet connection into the router, then an ethernet wire...
I'd say: just plug it in!
Routers are to be placed between the modem (cable modem or ISDN or something alike) and the LAN (in other words the switch, which opens up the LAN).
All users connect to...
The "switch" statement is a way of performing selection. It allows you to match a value against a known list. In C#:
// code starts
string mood = "happy";
switch (mood)
{
case "sad":
...
Nothing; the switch works the same if you use all ports, or only a few.
If you need to connect additional computers, you can either get a larger switch, or connect two switches between themselves.