ISQM 370 Final
Terms
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- Local Area Network (LAN)
- covers a limited geographic distance, such as an office, office building, or a group of buildings within close proximity.
- WIDE AREA NETWORK (WAN)
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covers large geographic distances, such as a state, a country, or even the entire world.
The Internet is a WAN.
A WAN is often a collection of connected LANs. - CLIENT/SERVER NETWORK
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is a network that contains one or more host computers (called “serversâ€) that provide some type of service to the other computers (called “clientsâ€).
Client/server networks are the emerging blueprint for all networks today. - NETWORK TOPOLOGY
- refers to the physical arrangement of computers in a network. Network topologies include bus, ring, and star
- BUS TOPOLOGY
- all computers are connected to a single cable over which all communications travel.
- STAR TOPOLOGY
- - has a central hub from which all other computers radiate.
- Network Server
- A computer system that serves as a central repository of data and programs shared by users in a network.
- Wired
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TWISTED-PAIR CABLE - two insulated copper wires twisted in a spiral.
FIBER OPTIC CABLE - uses a very thin glass or plastic fiber through which pulses of light travel. - Wireless Media
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INFRARED uses a red light (below the visibility of the human eye) to transmit information (short distance).
TERRESTRIAL MICROWAVES transmit high-speed radio signals in a path between relay stations (dish-shaped antenna) (medium distance).
SATELLITES are basically microwave transmission systems in space (long distance). - PEER-TO-PEER NETWORK
- treats all computers equally and is used primarily in small networks.
- Bandwith
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The capacity for information flow is called It is usually measured in bits/second.
Twisted Wire 500 BPS to 10 MBPS
Microwave 256 KBPS to 100 MBPS
Satellite 246 KBPS to 100 MBPS
Fiber-optic 500 KBPS to 10 GBPS