IP Nodes

Every single networked computer needs to know three things:

  1. IP Address – The operating system will respond to packets destined for its IP address unless in promiscuous mode.
  2. Netmask – Allows the OS to know how large the local network is.
  3. Router IP Address / Gateway – When your computer wants to communicate outside the subnet, then it must speak with a router.

Network Types

  • WAN – Wide Area Network. ISDN, Frame-Relay, ATM protocols.
  • LAN – Ethernet


  • TCP
    • Reliable – Prevents corrupted transfers.
    • FTP and HTTP use this protocol.
  • UDP
    • Unreliable but fast.
    • Great for streaming video or video games.