8.28.2009
♥ LAN
LAN-- Local Area Network
A local area network (LAN) is a computer network covering a small physical area, like a home, office, or small group of buildings, such as a school, or an airport.
A local area network (LAN) is a computer network covering a small physical area, like a home, office, or small group of buildings, such as a school, or an airport.
2 Technologies Commonly Used
* Ethernet
*WI-FI
INFOS
*Ethernet was developed at Xerox PARC in 1973–1975,and filed as U.S. Patent 4,063,220. In 1976, after the system was deployed at PARC, Metcalfe and Boggs published their seminal paper
>>Xerox PARC, is a research and development company in Palo Alto, California with a distinguished reputation for its contributions to information technology
Cabling
*Early LAN cabling had always been based on various grades of co-axial cable, but IBM's Token Ring used shielded twisted pair cabling of their own design, and in 1984 StarLAN showed the potential of simple Cat3 unshielded twisted pair—the same simple cable used for telephone systems. This led to the development of 10Base-T (and its successors) and structured cabling which is still the basis of most LANs today. In addition, fiber-optic cabling is used increasingly for high-bandwidth local networking.
*Early LAN cabling had always been based on various grades of co-axial cable, but IBM's Token Ring used shielded twisted pair cabling of their own design, and in 1984 StarLAN showed the potential of simple Cat3 unshielded twisted pair—the same simple cable used for telephone systems. This led to the development of 10Base-T (and its successors) and structured cabling which is still the basis of most LANs today. In addition, fiber-optic cabling is used increasingly for high-bandwidth local networking.
Strenght
*can be installed simply , upgraded, expaneded with little difficulty or moved and rearranged without disrupption
Ad-Hoc Topology
*An Ad-Hoc network is two or more computers connected to each other, without the use of a hub or connector, temporarily. The connection can be wired, wireless, Infrared or Bluetooth. This type of network is frequently used in a wireless network. For wired connections a cross-over cable is used. A cross-over cable looks like an Ethernet cable except two of the wires inside the connector are reversed. When configuring a wireless ad-hoc connection the wireless cards on each machine talk directly to each other. Ad-Hoc networks are commonly used to transfer and share files and printers. They are most often found in a home network.
Features
>Two or more computers connected to each other, without the use of a connecting device.
>Two or more computers connected to each other, without the use of a connecting device.
>The connection can be wired, wireless, Infrared or Bluetooth
For wired connections a cross-over cable is used. A cross-over cable looks like an Ethernet cable except two of the wires inside the connector are reversed.
>Commonly used for wireless networks, particularly infrared or Bluetooth (think PDA).
>Ad-Hoc networks are commonly used to transfer and share files and printers, they are most often found in a home networking environment.
>When configuring a wireless ad-hoc connection the wireless cards on each machine talk directly to each other.
Advantages
Cost effective. If wired, the only expense is the cross-over cable.
Easy to set up for small or short term connections
Disadvantages
Not intended for a long-term setup
Not expandable - generally only able to connect 2 systems via any one media at a time. (Could have a crossover cable connecting 2 portables & each computer is connected via IR or Bluetooth to a PDA … but that is about as extended as the network could get).
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