Network Topologies Objectives Simple Physical Topologies Bus Bus (continued)

Network Topologies Objectives Simple Physical Topologies Bus Bus (continued) www.phwiki.com

Network Topologies Objectives Simple Physical Topologies Bus Bus (continued)

Posada, Uriel, Executive Producer has reference to this Academic Journal, PHwiki organized this Journal Network Topologies Objectives Describe the basic in addition to hybrid LAN physical topologies, in addition to their uses, advantages in addition to disadvantages Describe the backbone structures that as long as m the foundation as long as most LANs Simple Physical Topologies Physical topology: physical layout of nodes on a network Three fundamental shapes: Bus Ring Star May create hybrid topologies Topology integral to type of network, cabling infrastructure, in addition to transmission media used

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Bus Single cable connects all network nodes without intervening connectivity devices Devices share responsibility as long as getting data from one point to another Terminators stop signals after reaching end of wire Prevent signal bounce Inexpensive, not very scalable Difficult to troubleshoot, not fault-tolerant Bus (continued) Advantages of Bus Topology Works well as long as small networks Relatively inexpensive to implement Easy to add to it

Disadvantages of Bus Topology Management costs can be high Potential as long as congestion with network traffic Ring Simple Physical Topologies Physical topology Physical layout of a network A Bus topology consists of a single cable—called a bus— connecting all nodes on a network without intervening connectivity devices

Advantages of Bus Topology Works well as long as small networks Relatively inexpensive to implement Easy to add to it Disadvantages of Bus Topology Management costs can be high Potential as long as congestion with network traffic Simple Physical Topologies Ring topology Each node is connected to the two nearest nodes so the entire network as long as ms a circle One method as long as passing data on ring networks is token passing Active topology Each workstation transmits data

Advantages of Ring Topology Easier to manage; easier to locate a defective node or cable problem Well-suited as long as transmitting signals over long distances on a LAN H in addition to les high-volume network traffic Enables reliable communication Disadvantages of Ring Topology Expensive Requires more cable in addition to network equipment at the start Not used as widely as bus topology Fewer equipment options Fewer options as long as expansion to high-speed communication Star

Simple Physical Topologies Star topology Every node on the network is connected through a central device Star (continued) Any single cable connects only two devices Cabling problems affect two nodes at most Requires more cabling than ring or bus networks More fault-tolerant Easily moved, isolated, or interconnected with other networks Scalable Supports max of 1024 addressable nodes on logical network Advantages of Star Topology Good option as long as modern networks Low startup costs Easy to manage Offers opportunities as long as expansion Most popular topology in use; wide variety of equipment available

Disadvantages of Star Topology Hub is a single point of failure Requires more cable than the bus Hybrid Physical Topologies: Star-Wired Ring Star-Wired Bus

Backbone Networks: Serial Backbone Daisy chain: linked series of devices Hubs in addition to switches often connected in daisy chain to extend a network Hubs, gateways, routers, switches, in addition to bridges can as long as m part of backbone Extent to which hubs can be connected is limited Backbone Networks: Serial Backbone (continued) Distributed Backbone

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Collapsed Backbone Parallel Backbone Logical Topologies Logical topology: how data is transmitted between nodes May not match physical topology Bus logical topology: signals travel from one network device to all other devices on network Required by bus, star, star-wired physical topologies Ring logical topology: signals follow circular path between sender in addition to receiver Required by ring, star-wired ring topologies

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