Let me try to explain... a little
Read this carefully, because it is easy to miss one of the points. It took me a while to understand this, so I'll try to explain in a simplified way.
HUB: A HUB is a device that connects several computers to each other. When a signal comes into the HUB, it is sent to EVERY computer on the HUB, even though only one of those computers is the actual recipient of the transmission. A HUB is a DUMB device that only sends a signal to all ports at the same time.
HUB ISSUES: Since it sends the signal to every port at the same time, if one of the other computers is trying to send a signal at the same time, it generates something called a "COLLISION". Two signals collide and try to go through the HUB at the same time. When this happens each computer retransmits the data until it gets through.
SWITCH: Almost identical to a HUB (externally), but internally it registers each computer connected to it. When a signal comes into the SWITCH, it is sent DIRECTLY to the ONE PORT that is the Recipient. So NONE of the other ports will be sent useless information. Collisions almost never occur with a switch. They do happen, but only when the two computers are trying to send information to eachother at the same time, and even then the switch usually handles it without a retransmission.
ROUTER: This is very different from a HUB and a SWITCH. What a Router does (also known as a Gateway) is it connects to a network (like your cable modem/ISP). It tells the network that it is the only computer connected and logged in. It allows you to connect a HUB to the ROUTER and the ROUTER will manage all the computers locally without letting the external network (cable modem/ISP/Internet) see them. So you can have five computers connected, each of them will have their own Dynamic IP address, so they can see each other, but when any of them go to the external network (Internet), the ROUTER makes it look like one computer.
ROUTER EXAMPLE:
iMac: 10.0.0.2 (IP Address)
iBook: 10.0.0.3 (IP Address)
iPad: 10.0.0.4 (IP Address)
iWalk: 10.0.0.5 (IP Address)
ROUTER/Airport2 BaseStation: 10.0.0.1 (IP Address, internal network, this is the address that your iMac, iBook, iPad, and iWalk will see)
Cable Modem: xxx.xxx.xxx.xxx (this number is provided by your ISP, usually dynamically/automatically) The ROUTER knows this number and that is what the ISP will see as the only computer connecting to the internet. So when the iMac connects to the Internet, it is actually connecting to the Router and the Router talks to the Internet for it. Same with the iBook, iPad, iWalk.
Your cable modem cannot transmit data faster than 10Mbs. Usually it won't transmit beyond 1-2 Mbs.
Your Airport2 BaseStation cannot transmit data faster than 11Mbs.
All the computers hardwired to the HUB will be able to send/receive data up to 100Mbs.
Ask me some more specific questions on any of the above and I'll try to explain with additional examples.
Quark
