Communication Topology

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Local Area Networks (Hybrid Topology)

A conceptual diagram of a local area network with the features of Bus topology combined with Ring topology. A design that utilizes a single length of cable, also known as the medium, with directly attached LAN stations. All stations share this cable segment. Every station on this segment sees transmissions from every other station on the cable segment; this is known as a broadcast medium. The LAN attachment stations are definite endpoints to the cable segment and are known as bus network termination points. This single cable segment lends itself to being a single point of failure. If the cable is broken, no LAN station will have connectivity or the ability to transmit and receive. For the Ring connection, all stations in a ring topology are considered repeaters and are enclosed in a loop. Ring topology has no end points. The repeater in this case is a function of the LAN-attached station’s network interface card (NIC). Because each NIC in a LAN-attached station is a repeater, each LAN station will repeat any signal that is on the network, regardless of whether it is destined for that particular station. If a LAN-attached station’s NIC fails to perform this repeater function, the entire network could come down. The NIC controller is capable of recognizing and handling the defective repeater and can pull itself off the ring, allowing the ring to stabilize and continue operating.

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