Lecture18 - Thursday, May 29 Homework #5 is due Lab #5...

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1 Thursday, May 29 Homework #5  is due Questions? Lab #5 report is due Friday before midnight Program #2  is due Thursday, June 5 Questions? No office hours today Extra hours tomorrow
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2 Today's Topics LAN topologies (logical, physical) Example multi-access technology Ethernet
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3 A little more about Physical Layer: LAN topologies Networks may be classified by "shape"  Three most popular:  Star  Ring  Bus  Networks may be classified by “shared medium"  Cable Wireless Others …
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4 Star topology All computers attach to a central point:  "Center" of star is usually a server or a switched hub
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5 Star topology Don't be confused by a diagram. “Topology” refers to logical connections (not physical layout) A likely diagram of a star topology LAN:
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6 Star topology If implemented with a hub, the hub must be  "programmable" (switched) more later on this
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7 Ring topology  Computers connected in a closed loop  First passes data to second, second passes data to third, etc.
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8 Ring topology  Refers to logical connections (not physical layout) In practice, there is a short connector cable from the  computer to the ring
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9 Ring topology  Can be implemented inside a “box" Don't confuse with Star topology
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10 Bus topology  Single cable connects all computers  Each computer has connector to shared cable Computers must synchronize and allow only one computer to transmit  at a time  Terminator Terminator
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11 Bus topology  Can be implemented inside a “box" Don't confuse with Star topology
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12 Ethernet  (RFC 826, 894, 895) Dominant wired LAN technology cheap $20 for NIC first widely used LAN technology simpler, cheaper than token LANs and ATM kept up with speed race: 10 Mbps – 10 Gbps  Metcalfe’s Ethernet Sketch (1976)
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13 Example  bus  topology:  Ethernet (original) Widely used LAN technology  Standard now managed by IEEE - defines formats, voltages,  cable lengths, etc. See 
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Lecture18 - Thursday, May 29 Homework #5 is due Lab #5...

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