DIYTP 2009
Network Basics How do computers communicate? Network Interface Card (NIC) Media Access Control Address (MAC) Unique to each NIC Example: 08:00:69:02:01:FC Internet Protocol Address (IP) Identifier for a device on a network Domain Name Service (DNS) Translates Uniform Resource Locator (URL) to specific IP address
Network Basics – How the Internet Works Warriors of the Net
Network Basics – Devices Hub Simplest and ‘dumbest’. Sends packets to all connections. Switch An ‘intelligent’ hub. Only sends packets to the port where it is supposed to go. Router Most sophisticated. Can be controlled in how it relays packets.
Network Basics - Protocols Protocol Agreed upon method of communication. Many types that computers and networks use: Transmission Control Protocol/Internet Protocol (TCP/IP) Connection-oriented Used for data that needs to get there
Network Basics - Protocols Figure 1.0 – TCP/IP 3-way handshake
Network Basics – Protocols User Datagram Protocol (UDP) Connection-less Used when some data can be lost Figure 1.1 – TCP vs. UDP
Network Basics – OSI Model Figure 1.3 – OSI model
Network Basics - Utilities IPConfig Information about your Windows-based connection Ping Sends test packet to see if another machine is reachable Tracert ‘Ping’ + route and time to get to destination