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.

Copyright 2005 QTL ™ Token Ring - Facts  Developed in the 1970s by IBM.  Sometimes known as IEEE  Is usually a star-wired ring.  Very stable.  No collisions since it uses Token Passing.  Quite slow and expensive. Token Ring & Ethernet Networks

Copyright 2005 QTL ™ Token Ring & Ethernet Networks 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.

Copyright 2005 QTL ™ Token Ring & Ethernet Networks Improvements on Token Ring FDDI  Fiber Distributed Data Interconnect  Like the CDDI network, it uses two rings.  Popular on campuses, since its use of fiber-optic cable makes it fast as well as stable.

Copyright 2005 QTL ™ Token Ring & Ethernet Networks Ethernet  Physical Topology – Usually a star, but bus topologies are also common.  Logical Topology – Always a bus.  Media Access Method – CSMA/CD  Typical Media Used – Varies.

Copyright 2005 QTL ™ Token Ring & Ethernet Networks Ethernet - Facts  The most widely used network architecture.  Developed by Xerox in the 1970s.  Sometimes called IEEE  Usually a star-wired bus.  Because of logical bus topology and CSMA/CD, traffic and collisions are real problems.

Copyright 2005 QTL ™ Token Ring & Ethernet Networks 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.

Copyright 2005 QTL ™ Token Ring & Ethernet Networks 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.