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					Home Networks
       What?
       Why?
       How?

       John Fulton
   john@johnfulton.org
        8/5/2009
    What is a home network?
• Local Area Network (LAN)
  – Small physical area
  – High data rates
  – No need to pay monthly fees for connections
    (for the LAN)
           Why a network?
• Sharing a Wide Area Network (WAN)
  connection
• Printer and file sharing
  – Printers and files attached to a PC on the
    network
• Network devices
  – Separately addressable devices not attached
    to a PC
• Local communications (IM, gaming)
            WAN connections
Today most WAN connections provide TCP/IP
  connection to Internet – conneciton to Internet
  Service Provider (ISP)

•   Modem (rare for LAN/WAN connections)
•   DSL
•   Cable modem
•   Satellite
•   ISDN
•   None
          WAN connections
• WAN connection usually provided by
  Internet Service Provider (ISP)
  – Physical connection to Internet
  – Network Access Device (Cable modem)
  – Email account
  – Other services (web page, setup program,
    etc.)
             Types of LANs
• Wired
  – 10BaseT, 100BaseT (10MG/100MB)
    • Ethernet (signals)
    • TCP/IP (message format)
    • Cat5 / Cat5E (wiring and connections)
• Wireless
  – IEEE 802.11b/g (11MB, 56MB)
          How to build a LAN
• Router (wired or wireless) – active, intelligent
  device that creates LAN and provides
  connection to WAN
   – Isolation
   – Camouflage
   – Protection
• HUB (wired) – passive, unintelligent, powered
  device that allows multiple communications
  connections to one wire
• Wire – 8 conductor unshielded twisted pair
  (UTP) cable with 8 conductor telephone-style
  connector.
• Wireless router
• cable
                 Router
• Router (wired or wireless) is usually the
  one device that is directly connect to the
  ISP provided WAN connection.
• Router has two “faces” – a WAN side and
  a LAN side.
• WAN side has “real” (public) internet
  address
• LAN side has “fake” (private) internet
  addresses
                   TV Cable


Cable Modem


         CAT5/5E
         cable



    PC
                   TV Cable


Cable Modem


         CAT5/5E
         cable

  Router
  (wired)


         CAT5/5E
         cable


    PC
                       TV Cable


     Cable Modem


             CAT5/5E
             cable

       Router
       (wired)




      CAT5/5E
PC    cables              PC
                       TV Cable


     Cable Modem


             CAT5/5E
             cable

        Router
        (wired)

                              Hub

          CAT5/5E
          cables

PC                     PC           PC
                    TV Cable


Cable Modem


          CAT5/5E
          cable

  Router
 (wireless)




    PC
                          TV Cable


     Cable Modem


               CAT5/5E
               cable

       Router
      (wireless)




PC                   PC
            Wired Issues
• Dynamic Host Control Protocol (DHCP) =
  Good
• Network address, is needed, is a magic
  number (192.168.0.1)
• Netmask is another magic number
  (127.127.127.0)
• Default gateway (192.168.0.1)
           Wireless Issues

• SSID – visible name for your network
• 802.11 Wired Equivalent Privacy (WEP)
• Wi-Fi Protected Access (WPA) & WPA2
           Recommendations
• Install and update professional quality anti-virus
  software on all PCs
• Buy a brand-name router (LINKSYS, DLINK,
  NETGEAR, etc.)
• Plan work-arounds for the times when the
  network fails
• Start from simple (one PC network) and work
  toward complex
• Powering off and on the Network Access Device
  and Router can solve many problems
          Recommendations
• Wireless cards and routers from the same
  manufacturer are sometimes easier to set-up
  than devices from multiple manufacturers
• Adding a LAN adds complexity
• Wired networks are faster and more reliable
  than wireless networks
• No ISP will ever support a LAN problem.
  Simplify any ISP problem to a problem with one
  PC
          Recommendations
• Most routers work “out of the box” with
  very little setup or configuration. (this is
  why you bought a brand-name router)
                Resources
• Simple network application to test from end-to-
  end http://www.thinkman.com/dimension4/
• Manuals and “quick” start guide from router
  manufacturer (this is why you bought a brand-
  name router)
• Router manufacturers do not want you to return
  the router to the store. Most have very good
  technical support.

				
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