Local Area Network -- Overview

My lan is a switched 100 MBit network based on Ethernet. It's structure is shown below. The red wires, run at 100 MBit in full duplex mode.

Bandwith:
----2 MBit downstream / 400 KBit upstream
----10 MBit
----100 MBit

Yui is the firewall, Teto the server, Lafiel my workstations, Maya the laptop and Gendo the backup server.

	       __    __    __    __
	      (  \__/  \__/  \__/  )
	       )  (  -- (  --  )  (
	      ( -- ) Internet ( -- )
	       )  (_ ,- _) -. _)  (
 	      (__/  \__/  \__/  \__)
		           |
               .-------.   |
               |     __|___|__
               |    / cable  /|
               |   / modem  //
               |  /________//
               |  [  .... ]/
       .----.  |
       |    |  |
       |   _|__|___
       |  |.------.|
       |  ||------||
       |  ||------||
       |  |`------'|
       |  |[==]: o |
       |  |        |
       |  |        |
       |  |  yui   |
       |  |________|
       |  |________|
       |  |________|
       |
       | 192.168.105.1
       |
       |           ________
       |          | switch |
       |          | - =====|
       |          `--------'
       |           |||||
        `----------'||| `-----------------.
      .-------------'| `-------.           |
     |               |          |          |
     |               |          |          |
  ___|____           |          |          |
 |.------.|          |          |           `----.
 ||------||          |          |                 |
 ||------||          |          |                 |
 ||------||      ____|___       |      maya       |
 ||------||     |.------.|      |  ____________   |
 ||------||     ||------||      | |,----------.|  |
 |`------'|     |`------'|      | ||    .-.   ||  |
 | [==] o |     | [==] o |      | ||    oo|   ||  |
 | . . .  |     | :   .  |      | ||   /`'\   ||  |  lafiel
 |        |     |--------|      | ||__(\_;/)__||  |
 |  teto  |     | gendo  |      `/ ::::;::::: //  | ,-=====-.
 |        |     |        |      / :::::::::: //   | ||_____||
 |________|     |        |     /_____-_-____//    | | '---' |
 |__|__|__|     |========|     `------------'      `|_______|

192.168.105.3  192.168.105.10  192.168.105.11    192.168.105.12