Institute of Technology, Sligo Dept of Computing Tollbooths & Highways Paul Flynn

Institute of Technology Sligo - Dept of Computing Compare Networks by..  What is flowing  What different forms flow  What rules govern flow  Where does the flow occur

Institute of Technology Sligo - Dept of Computing Examples of Networks Utilities

Institute of Technology Sligo - Dept of Computing Examples of Networks BiologicalUtilities

Institute of Technology Sligo - Dept of Computing Examples of Networks SocialBiologicalUtilities

Institute of Technology Sligo - Dept of Computing Examples of Networks TransportationSocialBiologicalUtilities

Institute of Technology Sligo - Dept of Computing Examples of Networks TransportationSocialBiologicalUtilitiesCommunications

Institute of Technology Sligo - Dept of Computing Communications Pager/ Cellular Postal Service LANs/WANsTelephoneTV/Radio

Institute of Technology Sligo - Dept of Computing LANs and WANs  Local Area Networks (LANs)  Operate locally  Multi-user high speeds  Wide Area Networks (WANs)  Operate over larger areas  Access over serial low speeds

Institute of Technology Sligo - Dept of Computing Hub Local Area Networks  What was the first type of computer network called?  Do you know the name of the first device used to connect computers?

Institute of Technology Sligo - Dept of Computing Hub LAN segmentation; MAC addresses BridgeSwitch Router Faster bridge; Full bandwidth Path determination; Packet switching LAN Devices (Tollbooths)  Connects PCs; Repeats signals

Institute of Technology Sligo - Dept of Computing Modem Analog to Digital; Remote LAN connections Router Path determination; Packet switching WAN Devices (Tollbooths)

Institute of Technology Sligo - Dept of Computing Routers connect LANs & WANs

Institute of Technology Sligo - Dept of Computing Routers are the “Tollbooths” of the Information Superhighway

Institute of Technology Sligo - Dept of Computing In Our Highway Analogy...  What is flowing?  Traffic  What different forms flow?  Cars, Trucks, Buses, etc.  What rules govern flow?  Traffic Laws & Rules of Courtesy  Where does the flow occur?  Streets

Institute of Technology Sligo - Dept of Computing In Computer Networks...  What is flowing?  Data  What different forms flow?  Text, Video, Audio  What rules govern flow?  Standards & Protocols  Where does the flow occur?  Wires, Fiber, Atmosphere

Institute of Technology Sligo - Dept of Computing LAN Media (Highways)  Coaxial Cable  Shielded & Unshielded Twisted Pair (STP & UTP)  Fiber Optics  Wireless

Institute of Technology Sligo - Dept of Computing Coaxial Cable  Used for Cable TV  Almost obsolete as a LAN media  Types:  10Base2  10Base5

Institute of Technology Sligo - Dept of Computing Category 5 UTP  Easy to Install  Cheap & Reliable  Types:  10BaseT  100BaseTX

Institute of Technology Sligo - Dept of Computing Fiber Optics  Uses Light  Very Fast!  Types:  100Base-FX  1000Base-LX

Institute of Technology Sligo - Dept of ComputingMediaBandwidthDistance 10Base Mbps185m 10Base Mbps500m 10BaseT10Mbps100m 100BaseTX100Mbps100m 100Base-FX100Mbps2000m 1000Base-LX1000Mbps3000m Comparing Speed & Distance

Institute of Technology Sligo - Dept of Computing WAN Services  The topic of Semester 4  For now, just know that the following are WAN services...  Modem  ISDN  Frame Relay  T1/E1  T3  STS-1, STS-3, STS-48 (SONET)

Institute of Technology Sligo - Dept of Computing Bandwidth Do we get the full 100Mbps? No! What do we call what we actually get? Throughput When we say our Lab is capable of 100Mbps, what do we call that speed?

Institute of Technology Sligo - Dept of Computing Throughput  Bandwidth  Why?  PCs & Servers  Other Users  Routing  Topology Design  Type of Data  Time of Day

Institute of Technology Sligo - Dept of Computing Why is Bandwidth Important?  It is finite  It can save money (How?)  Key measure in design & performance  Demand increases constantly