Download e-book for kindle: Network Consultants Handbook by Matthew J Castelli

By Matthew J Castelli

This source for community experts and engineers supplies recommendation on auditing, studying, and comparing any community surroundings. It demonstrates the place and the way to assemble suitable details and the way to research it, and overviews the know-how at every one layer of the community. There are chapters at the open process interconnections version, LAN topologies, Ethernet, FDDI, telecommunications and telephony, body relay WAN research, and voice know-how. different themes contain distant entry, routing protocols, and multiprotocol label switching. pattern kinds for community auditing and documentation are incorporated. Castelli is a expert and firm community layout engineer for an international telecommunications integrator.

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Figure 2-7 is an example of a bus topology. Figure 2-7. Bus Topology Tree Topology The tree topology is a logical extension of the bus topology and could be described as multiple interconnected bus networks. The physical (cable) plant is known as a branching tree with all stations attached to it. The tree begins at the root, the pinnacle point, and expands to the network endpoints. This topology allows a network to expand dynamically with only one active data path between any two network endpoints.

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.

If a cable to one of the workstations fails, the rest of the devices are unaffected unless they need to access resources from the "disconnected" device. Ring Topology All stations in a ring topology are considered repeaters and are enclosed in a loop. Unlike the star (hub-and-spoke) topology, a 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.

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