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Embed code for: 01.5 Physical vs. Logical Topologies
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01.5 Physical vs. Logical Topologies
9/11/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/1/pages/5 1/4 Physical vs. Logical Topologies Section 1: Exploring the Functions of Networking Each type of network has both a physical and a logical topology. The physical topology of a network refers to the physical layout of the devices and cabling. You must match the appropriate physical topology to the type of cabling that you will install, such as twisted pair, coaxial, or fiber. Therefore, understanding the type of cabling that is used is important in understanding each type of physical topology. The logical topology defines the logical path that data will travel from one point to another. First, look at some of the types of physical topologies that you may encounter. Bus: In early bus topologies, computers and other network devices were cabled together in a line using coaxial cable. Modern bus topologies establish the bus in a hardware device and connect the host devices to the bus using twistedpair wiring. Ring: In a ring topology, computers and other network devices are cabled together with the last device connected to the first to form a circle or ring. Each device is connected to exactly two neighbors and has no direct connection to a third. The physical connection can be made using either coaxial or fiber wiring. 9/11/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/1/pages/5 2/4 Star: The most common physical topology is a star topology. In this topology, a central cabling device connects the computers and other network devices. This category includes star and extendedstar topologies. The physical connection is commonly made using twistedpair wiring. Mesh: In a mesh topology, every network device is cabled together with many others. Redundant links increase reliability and selfhealing. The physical connection is commonly made using fiber or twistedpair wiring. The logical topology is the path along which data travels from one point in the network to another. 9/11/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/1/pages/5 3/4 It is possible for the logical and physical topology of a network to be the same type, but physical and logical topologies often differ. For example, an Ethernet hub is an example of a physical star topology with a logical bus topology. Click the Play button to watch a short video about logical and physical topologies. 9/11/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/1/pages/5 4/4 A physical star topology is by far the most common implementation of LANs today. Ethernet uses a logical bus topology in either a physical bus or a physical star topology. An Ethernet hub is an example of a physical star topology with a logical bus topology. Up Next: Interpreting a Network Diagram