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Mis Networking Questions

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2. What are the main telecommunications transmission media and types of networks?

Name the different types of physical transmissions media and compare them in terms of speed and cost?
Twisted wire consists of strands of copper wire twisted in pairs and is the oldest transmission medium. Many telephone systems had twisted wires installed for analog communication but can also be used for digital. The twisted wires used in today’s LANs, such as CAT5, can obtain speeds up to 1 Gbps but is limited to a maximum run of 100 meters. Coaxial cable consists of thickly insulated copper wire that can transmit a larger volume of data than that of twisted wire. Coax was used in early LANs and is still used for longer runs on larger buildings. Coax has a maximum speed of up to 1 Gbps. Fiber-optic cable has bound strands of clear glass fiber – each one the thickness of human hair. Data is transformed into pulses of light that are then sent through the cable by a laser device at rates varying from 500 Kbps to several trillion bits per second. Fiber-optic is considerably faster, lighter, and durable that wire media and well suited to systems requiring transfers of large volumes of data. But it is more expensive and harder to install than other physical media.

Define a LAN, and describe its components and the functions of each component.
LAN is a local area networks connect PCs and other digital devices together within a 500-meter radius and used for many corporate computing tasks. LANs typically connect a few computers in a small office, all of the computers in one building, or all of the computers in several buildings in close proximity. LANs are also used to link long-distance Wide Area Networks (WANs) and other networks around the world. One computer in a LAN is a dedicated file server which provides users with access to shared computing resources including

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