easy to wire, quick response, less expensive Disadvantages bad connection to the cable can bring down the entire network Troubleshooting collision occurs when 2 nodes send messages simultaneously
Star Topology • Each host is connected to a central connecting device • The central connecting device can be a hub, a switch, or a SOHO router • This is the most commonly used topology • NOTE: two star Topologies can be connected via their central connecting devices to form a star-bus topology • Advantages • Easy to install and wire • No disruptions to the network when connecting or removing devices. • Easy to detect faults and to add/remove parts. • Management • Disadvantages • Single point of Failure, if hub, switch or concentrator fails , nodes attached are disabled. • Requires more cable length than a linear topology.
Star Topology In star network, each station is connected via a point-to-point link to a central point. The central point may be “passive”, “active”, or “intelligent”. A passive device simply connects the arms of a star, no signal regeneration is performed, such as wiring panels, meaning they act only as connection points and don´t regenerate the signal. An active device is like a passive hub, except that it regenerates signals. Intelligent device not only regenerate signals but also perform activities such as intelligent path selection and network management.
Star-wired Topologies Stars versus a single line Two types: 1. Star-wired bus • (often call the star topology) 2. Star-wired ring
Star-wired Bus Topology • Logically operates as a bus, but physically looks like a star. • Star design is based on hub. All workstations attach to hub. • Unshielded twisted pair usually used to connect workstation to hub. • Hub takes incoming signal and immediately broadcasts it out all connected links. • Hubs can be interconnected to extend size of network. Very popular! Biggest disadvantage: when one station talks, everyone hears it. This is called a shared network . All devices are sharing the network medium.
Star-wired bus physical topology for a LAN
Interconnection of two hubs in a star-wired bus LAN
Bus/Tree Topology Workstation has a network interface card (NIC) provides a physical connection to a network • Attaches to the bus (a coaxial cable) via a tap. • The workstation can send and receive data on the network through NIC • Tap is a passive device • Does not alter the signal • Does not require electricity to operate Baseband signals Digital signals – 10 Mbps Bidirectional and more outward in both directions from the workstation transmitting. Easy to install and maintain • Fewer than 100 workstations Buses can be split and joined, creating trees .
Star & Tree Topology Larger networks use the extended star topology also called tree topology. When used with network devices that flter frames or packets, like bridges, switches, and routers, this topology signifcantly reduces the trafc on the wires by sending packets only to the wires of the destination host.
- Fall '19
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