tollbooths & highways devices, media, & bandwidth by: allan johnson
TRANSCRIPT
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Tollbooths & Highways
Devices, Media, & Bandwidth
By: Allan Johnson
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Compare Networks by... What is flowing What different forms flow What rules govern flow Where does the flow occur
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Examples of Networks
Utilities
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Examples of Networks
Biological
Utilities
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Examples of Networks
SocialBiological
Utilities
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Examples of Networks
Transportation
SocialBiological
Utilities
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Examples of Networks
Transportation
SocialBiological
Utilities
Communications
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Communications
Pager/Cellular
PostalService
LANs/WANs
Telephone
TV/Radio
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LANs & WANs Local Area Networks (LANs)
Operate locally Multi-user access @ high speeds
Wide Area Networks (WANs) Operate over larger areas Access over serial links @ low speeds
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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
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LAN Devices (Tollbooths) Connects PCs;
Repeats signalsHub
LAN segmentation; MAC addresses
Bridge
Switch
Router
Faster bridge; Full bandwidth
Path determination; Packet switching
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WAN Devices (Tollbooths)
Modem Analog to Digital;
Remote LAN connections
Router Path determination;
Packet switching
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Routers connect LANs & WANs
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Routers are the “Tollbooths”
of theInformation
Superhighway
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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
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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
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LAN Media (Highways) Coaxial Cable Shielded & Unshielded Twisted Pair
(STP & UTP) Fiber Optics Wireless
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Coaxial Cable
Used for Cable TV Almost obsolete as
a LAN media Types:
10Base2 10Base5
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Category 5 UTP
Easy to Install Cheap & Reliable Types:
10BaseT 100BaseTX
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Fiber Optics
Uses Light Very Fast! Types:
100Base-FX 1000Base-LX
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Comparing Speed & Distance
Media Bandwidth Distance
10Base2 10-100Mbps 185m
10Base5 10-100Mbps 500m
10BaseT 10Mbps 100m
100BaseTX 100Mbps 100m
100Base-FX 100Mbps 2000m
1000Base-LX 1000Mbps 3000m
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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)
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When we say our Lab is capable of 100Mbps, what do we call that speed?
BandwidthDo we get the full 100Mbps?
No!What do we call what we actually get?
Throughput
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Throughput Bandwidth Why?
PCs & ServersOther UsersRoutingTopology DesignType of DataTime of Day
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Why is Bandwidth Important?
It is finite It can save money (How?) Key measure in design &
performance Demand increases constantly
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Good Luck
On Your
First Test!!
That’s It For Chapter 1!!