1. Week Four Rouda’s Sections

2.  LAN - Local Area Network ◦ small area (e.g. a building) ◦ small number of machines  WAN - Wide Area Network ◦ large area ◦ usually a collection of LANS  Other Networks ◦ PAN - personal area network ◦ MAN - metropolitan area network

3.  LAN - Local Area Network ◦ small area (e.g. a building) ◦ small number of machines  WAN - Wide Area Network ◦ large area ◦ usually a collection of LANS  Other Networks ◦ PAN - personal area network ◦ MAN - metropolitan area network

4.  Bus Network  Token Ring  Mesh  Star

5.  Bus Network  Token Ring  Mesh  Star

6.  Bus Network  Token Ring  Mesh  Star

7.  Bus Network  Token Ring  Mesh  Star ◦ Ethernet is the most common type of LAN ◦ Advantage:  Fault Tolerant ◦ Disadvantage:  lots of wires

8.  Switch  Router  Bridge, Repeater,...  Printers  Servers

9.  Twisted-Pair ◦ used in your house for the phone ◦ used by a DSL Modem  Coaxial Cable ◦ used in your house for cable TV ◦ used by a Cable Modem  Radio / WiFi  Fiber Optic Q: Which is better, Cable or DSL? A: It depends on your location. Q: Which is better, Cable or DSL? A: It depends on your location.

10.  Step One: Buy a Router  Step Two: Call your local cable or phone company  Step Three : Run software to configure your router:  security (password, pick a security protocol, etc)  max number of users  visible or hidden Wireless Formats A not on same frequency as phones short range B and G longer range and faster than A cordless phones can interfere B is common in airports, etc. N fastest, good range not compatible with B and G

11.  LAN ◦ probably Ethernet  WAN ◦ google "VPN Providers" ◦ Virtual Private Network ◦ Encrypted Data is sent between office locations using a standard internet connection

12.  Ethics ◦ how safe is the internet?  Legal Issues ◦ can my employer read my email?  Security ◦ what is a firewall?