Tollbooths & Highways Devices, Media, & Bandwidth By: Allan Johnson.

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Presentation transcript:

Tollbooths & Highways Devices, Media, & Bandwidth By: Allan Johnson

Compare Networks by... What is flowing What different forms flow What rules govern flow Where does the flow occur

Examples of Networks Utilities

Examples of Networks BiologicalUtilities

Examples of Networks SocialBiologicalUtilities

Examples of Networks TransportationSocialBiologicalUtilities

Examples of Networks TransportationSocialBiologicalUtilitiesCommunications

Pager/ Cellular Postal Service LANs/WANsTelephoneTV/Radio

LANs & WANs Local Area Networks (LANs) Operate locally Multi-user high speeds Wide Area Networks (WANs) Operate over larger areas Access over serial low speeds

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? Hub

LAN Devices (Tollbooths) Connects PCs; Repeats signals Hub LAN segmentation; MAC addresses BridgeSwitch Router Faster bridge; Full bandwidth Path determination; Packet switching

WAN Devices (Tollbooths) Modem Analog to Digital; Remote LAN connections Router Path determination; Packet switching

Routers connect LANs & WANs

Routers are the “Tollbooths” of the Information Superhighway

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

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

LAN Media (Highways) Coaxial Cable Shielded & Unshielded Twisted Pair (STP & UTP) Fiber Optics Wireless

Coaxial Cable Used for Cable TV Almost obsolete as a LAN media Types: 10Base2 10Base5

Category 5 UTP Easy to Install Cheap & Reliable Types: 10BaseT 100BaseTX

Fiber Optics Uses Light Very Fast! Types: 100Base-FX 1000Base-LX

Comparing Speed & Distance MediaBandwidthDistance 10Base Mbps185m 10Base Mbps500m 10BaseT10Mbps100m 100BaseTX100Mbps100m 100Base-FX100Mbps2000m 1000Base-LX1000Mbps3000m

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)

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

Throughput  Bandwidth Why? PCs & Servers Other Users Routing Topology Design Type of Data Time of Day

Why is Bandwidth Important? It is finite It can save money (How?) Key measure in design & performance Demand increases constantly

Good Luck On Your First Test!! That’s It For Chapter 1!!