Sabtu, 12 Juni 2010

LAN

TCP / IP (Transmission Control Protocol / Internet Protocol) is a group communication protocol governing the accumulation computers on the Internet. The computers are connected to the internet to communicate with TCP / IP protocol, because it uses the same language differences in the type of computer and operating system is not a problem. PC computer with Windows operating systems can communicate with a Macintosh computer or with a Sun SPARC running Solaris. So, if a computer using a protocol prescript and connected directly to the Internet, the computer can connect with computers in the world where paronomasia which is also connected to the internet.
The characteristics of computer networks:
1. share hardware (hardware)
2. sharing software (software)
3. sharing of communication channels (Internet)
4. easily share accumulation
5. facilitate communication between network users
Local Area Network (LAN) is the number of computers linked together in one particular area that is not so broad, as in one office or building. Broadly speaking there are two types of networks or LANs, namely Peer to Peer network and Client-Server networks.

In Person to peer network, every computer connected to the network can act either as a workstation or server. While in Client-Server networks, only one yangbertugas computer as a server and other computers acting as workstations.
Between these two types of networks each have advantages and disadvantages, in which each would be explained.
LAN is composed of several basic elements that include components and software elements, namely
1. Physical Component
Personal Computer (PC), Network Interface Card (NIC), cable, network topologies.
2. Component Software
Network Operating Systems, Network Adapter Drivers, Network Protocols.
Personal Computer (PC)
Individualized type of computers used in the network will greatly determine the performance of the network. Computers with high performance will be able to send and access the fast accumulation in tissue. In the client-server type network, a computer that functioned as the computer is absolutely necessary to have a higher performance compared to the other computers as his workstation, because the computer would be on duty to provide facilities and manage the network operational.
Network Interface Card (NIC)
Based on the type of bus, there are several types of meshwork bill Programme (nic) or meshwork cards, namely ISA and PCI.
We have kind of meshwork bill that is widely used, namely PCI
Ethernet
In a network with access prescript CSMA / CD or Carrier Sense Multiple Access with Collision Detection, a convexity (A) that will send checks the first condition of accumulation of data points. If there is no flow of data / blank it will send its data convexity and convexity when the other (B) that are currently using accumulation point then the convexity (A) will wait and try to check back. In prescript access is possible at any moment occurred several convexity transmit data simultaneously impinging or causing a collision. In this condition, these nodes will be void send accumulation and will try it again when the line is not busy

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