Copyright 2005 The Centers for Quality Teaching and Learning ™ Token Ring and Ethernet Networks...

Copyright 2005 The Centers for Quality Teaching and Learning™

Token Ring and Ethernet Networks

Networking I

Copyright 2005 QTL™

Token Ring & Ethernet Networks

Token Ring

Physical Topology – Usually a star.

Logical Topology – Always a ring.

Media Access Method – Token Passing.

Typical Media Used - Varies, but usually twisted pair cabling.


Token Ring - Facts

Developed in the 1970s by IBM.Sometimes known as IEEE 802.5.Is usually a star-wired ring.Very stable.No collisions since it uses Token Passing.Quite slow and expensive.




Improvements on Token Ring

CDDI

Copper Distributed Data Interconnect

Uses two rings

If one ring fails, the other is in place to keep the network up and running.



Improvements on Token Ring

FDDIFiber Distributed Data InterconnectLike the CDDI network, it uses two rings.Popular on campuses, since its use of fiber-optic cable makes it fast as well as stable.



EthernetPhysical Topology – Usually a star, but bus topologies are also common.Logical Topology – Always a bus.Media Access Method – CSMA/CDTypical Media Used – Varies.



Ethernet - FactsThe most widely used network architecture.Developed by Xerox in the 1970s.Sometimes called IEEE 802.3.Usually a star-wired bus.Because of logical bus topology and CSMA/CD, traffic and collisions are real problems.



Ethernet “Flavors”

Naming system used follows the pattern:

Speed – Baseband\Broadband – Cabling Type Used

It can be tricky determining which cable type is used from the flavor's name.



Ethernet “Flavors” - Examples

10Base-T – Common Ethernet implementation that runs at 10 Mbps using twisted pair cabling.

10Base2 – Ethernet using Thinnet running at 10 Mbps.

10Base5 – Ethernet using Thicknet running at 10 Mbps.

Copyright 2005 The Centers for Quality Teaching and Learning ™ Token Ring and Ethernet Networks...

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