• Cable
• DSL - Digital Subscriber Line
• Cellular network
• Satellite
• Dial-up

• Rented, dedicated lines
• Metro Ethernet
• Business DSL
• Satellite

• Intranet
  • Private company network
  • May be accessed from other networks using VPN technology
• Extranet
  • Intranet resources shared with authorized users from the Internet
  • Example: Company providing access to internal resources to partners
• Internet
  • The network of all networks
  • Binds everything together
  • Open access, or at least, should be

• LAN - Local Area Network
• WAN - Wide Area Network
  • Can mean a connection between two LANs physically separated, or just the Internet
• MAN - Metropolitan Area Network
• WLAN - Wireless LAN
• SAN - Storage Area Network

Star
Hybrid Star
Bus - deprecated
Ring - deprecated

Point to point
Hub and spoke

• Core
• Any router besides Core needs to transmit through Core
  Mesh
• Most expensive
• Most reliable