Computer Networking

About Wireless Network

2012-01-04T21:21:00.001+07:00

Wireless is a technology that connects the two devices to exchange data without cable media. Data is exchanged through the medium of light waves (such as infraredtechnology on the remote TV) or radio waves (such as bluetooth on your computer and phone) with a certain frequency.

The advantages of this technology is to eliminate the use of wires, which could beenough to disturb the aesthetics, and also the complexity of the installation to connect more than 2 devices simultaneously. For example: to connect a computer server with aclient computer 100, it takes a minimum of 100 pieces of cable, length varies according to distance from the server the client computer. If kabel2 is not through a special line that is covered (such as cable tray or conduit), it can interfere with views of the eye or theinterior of a building. Unpleasant sights are not found in the relationship between devices with Bluetooth wireless.

Wireless is a wireless technology, in this case is to have telecommunications usingelectromagnetic waves instead of cables. Current wireless technology is growing rapidly, can be seen by naked eye with a growing number of cellular phone usage, but italso develops wireless technology used for Internet access.

For example:

a. Infrared (IR)

b. wireless wide area network (bluetooth)

c. Radio Frequency (RF)

d. wireless personal area network / cellular phone (GSM / CDMA)

e. wireless lan (802.11)

Topology Tree

2011-11-30T09:06:00.004+07:00

Tree topology is the topology of computer networks is shaped like a tree. In the tree topology all the computers do not have the same position. Computers that higher position control computer underneath it, so the computer network is dependent on computers that higher position. For the same computer kedudukanya called peer topology. See the picture below

Tree Topology

Topology STAR

2011-11-29T21:59:00.001+07:00

Star topology is the topology of the most popular. Star topology is a network topology of the most frequently used. Such topology is usually in apikasikan in schools, office buildings, or university. In a star topology, centralized control and all links must pass through the center of the channel data to all nodes or a computer of his choice. Central node is called the primary station or server and the other part is called the secondary station or client. In the star topology, which disrupted the connection between a node and the switch / hub does not affect the network. If the switch / hub disrupted (damaged) then all the nodes which connect to the hub can not communicate with each other. A node is a connection or connection point in the network, while the hub serves to receive signals and pass all of the computer connected to the hub. Star topology has the advantage of centralized control so easily in network management, high flexibility, ease of detection and isolation of faults or damage.If the hub / switch off the the network will die.

STAR Topology

Topology RING

2011-11-26T00:32:00.001+07:00

Ring topology is the topology of computer networks that is shaped like a ring, all computers connected to each other and uninterrupted. The drawback of this topology is that every node in the network will always come and manage the information passed in the network, so if there is a disturbance in a node then the entire network will be disrupted. The advantages of Ring topology is not collision or collisions such as data transmission on the bus topology, since only one node can transmit data at a time.

Topology RING

Topology BUS

2011-11-25T22:52:00.002+07:00

BUS topology is old technology, connected by a cable in a line topology of computer networks that use coaxial cable and use a BNC connector. At each end of the BUS topology there is a 50 Ohm terminator as an end connections. BUS topology advantages include the installation and pemeliharaanya cheap. BUS topology weakness that is less reliable, if one network is broken then all tissues will die.

Topology BUS

Topology of Computer Networks

2011-11-21T17:33:00.000+07:00

Computer network topology is the architecture of a computer network or a picture of the relationship between the planning of dams computer Local Area Network LAN or Wide Area Network WAN. There are several types of computer network topologies are used.

1. BUS topology
2. RING topology
3. STAR topology
4. TREE topology
5. MESH topology
6. HYBRID topology

Router

2011-11-21T17:22:00.000+07:00

The router is a computer networking device that is capable of transmitting data or information from one network to another are different. The router will find the best path to send a message based on the destination address and source address. This process is called routing. Each router knows its local network addresses. The router's capabilities include the following.

1. The router can translate information between LAN Local Area Network and Internet
2. The router will find an alternative path to transmit data via the Internet.
3. Efficiently regulate signaling pathways and can regulate the flow of data between the two protocols.
4. Can manage data between the network topology.
5. Can manage data over coaxial cable, fiber optic or twisted pair

Router

Symbol Router

Bridge Computer Network

2011-11-19T12:45:00.000+07:00

Bridge functions the same as the repeater function in a computer network but the bridge is more intelligent than repeaters. Bridge works at OSI layer 2. Bridge can connect a computer network having a different transmission. For example bridges can connect computers using Ethernet Baseband networks and computer networks that use Ethernet Broadband.

Bridge is able to separate a portion of the traffic due to implementation of the frame filtering mechanism. This mechanism is called store and foward. Nevertheless generate broadcast traffic in the LAN Local Area Network can not be filtered by the bridge. Bridge can know each network segment addresses of each computer next to it. Bridge is like a traffic cop at the crossroads of governing during peak hours in computer networks. Bridge can also be used to connect networks that use different cable types or different computer network topology.

Bridge

Bridge Symbol

Repeater

2011-11-19T12:15:00.000+07:00

Repeater is a device that works at layer 2. Repeater is a device used to amplify signals in a computer network. Repeater will receive signals from a Local Area Network LAN segmentand then transmit back to the same signal strength. In this way the network LAN Local AreaNetwork can be a lot. The use of repeaters between two or more segments require the use of the same physical layer protocol between the cable segments.

Repeater

Symbol Repeater

Switch

2011-11-18T15:39:00.000+07:00

Switch is a concentrator that has a better traffic management in comparison with the hub.Switches are network devices that work layer of data-link, similar to a bridge, or often referred to as a multiport bridge function to connect multiple LAN segments within a larger network. Compare also with the hub.

Switches have the ability to determine the destination MAC address of the packet. Rather than passing the packet to all ports, switches forward it to the port where he addressed.Thus, the switch can drastically reduce network traffic. Switch maintains a list of MAC addresses that are connected to the port-port which it uses to determine where to send the package. Because it operates on MAC addresses instead of the IP address, the switch is generally faster than a router. currently there are many switches that managable. Besides being able to regulate traffic at the moment there are switches that can also give the IP address.

Switch

Symbol Switch

HUB

2011-11-18T11:45:00.000+07:00

The hub is a concentrator on a computer network. Which serves to unite the network cablesfrom each workstation, server, or other device. different hubs with switches. Hub with connections in one direction, meaning that if the computer has to take turns if you want tocommunicate with each other, like a walkie talkie.

HUB

Symbol HUB

Ethernet Card / Network Interface Card

2011-11-17T23:48:00.000+07:00

Ethernet Card is a card that is used for the interconnection network between computerswith the other network devices. How it works ethernet cards based on a broadcast network,every node in a network receives every transmission of data sent by a node to another.every ethernet card has a 42 bit address at all familiar with the MAC (Medium Access Control) address. Address has been implanted into setiam series of ethernet card.

Ethernet Card / Network Adapter

Cable

2011-11-17T23:35:00.000+07:00

There are several types of cables used and the standard data communication in computer networks. These cables must be tested before eligibility before marketed and in use. Keep in mind that nearly 85% of failures in the computer network because of an error inthe communication media used, including cables and connectors as well as kiualitaspemasanganya. Types of cables used in computer networks.

1. Coaxial Cable
2. Twisted Pair Cable (UTP and STP)
3. Fiber Optic Cable

Computer Network Hardware

2011-11-17T17:30:00.001+07:00

In establishing the network is both a Local Area Network (LAN) and Wide Area Network (WAN), we need a media hardware and software. some media hardware needed to build a computer network.

1. Cable
2. Ethernet Card
3. Hub
4. Switch
5. Repeater
6. Bridge
7. Router

WAN (Wide Area Network)

2011-11-17T17:17:00.000+07:00

This type of computer network is a network that already uses wirelless transmission,satellite, or fiber optic cable, as network coverage is broader than Local Area Network (LAN) Wide Area Network (WAN) and Metropolitan Area Network MAN. Notonly covering one city or inter-regional inter-state but is now reaching even the world. WAN is usually more complicated and very complex compared to the LAN and MAN. Use manymeans to connect between the Local Area Network LAN and Metropolitan Area Network MAN to Wide Area Network WAN into a global communications like internet, however the Local Area Network LAN, Metropolitan Area Network MAN and Wide Area Network WAN is not much different in some respects. only thescope of its area being different.

WAN Wide Area Network

Metropolitan Area Network (MAN)

2011-11-17T16:37:00.000+07:00

This type of computer network has a larger scale than the network computer Local Area Network. Computer Network Metropolitan Area Network (MAN) usually covers the entirecity, province or state. for example, a network of several corporate offices within a large citywhich is connected to a computer network with each other.

Metropolitan Area Network (MAN)

Local Area Network (LAN)

2011-11-17T15:55:00.000+07:00

Local Area Network (LAN) is a computer network is the smallest. Computer network that isrestricted to relatively small areas. Generally limited by the environmental area, such as schools, offices, or buildings. The distance between nodes on a Local Area Network (LAN) the maximum is 100 m.

Local Area Network (LAN)

Types of computer networks

2011-11-17T15:42:00.000+07:00

The types of computer networks
In general, a computer network is divided into 3 types:
1. Local Area Network (LAN)
2. Metropolitan Area Network (MAN)
3. Wide Area Network (WAN)

Client Server Computer Networking

2011-11-17T13:06:00.000+07:00

Client Server Computer Networking is a computer networking technology that uses a computer unit that functions as a server, which only provide services for the client computer, and the client also only request a service from the server. Access is done transparently from the client by first logging into the server.

Client can only use the resources provided by the server in accordance with authority granted by the network administrator. Applications that run on the client side can be a resource that is available on the server or application is installed on the client but can onlyrun after connecting to the server.

Type of Client Server computer networking services are:

1. File server
2. Print Server
3. Database Server
4. Document Information Processing

Peer To Peer

2011-11-17T09:16:00.000+07:00

Peer means a co-worker. Peer to peer network is a computer network consisting of multiple computers. Usually consists of over 10 computer. Peer to peer computer network are typically used for laboratory, research, and various other things. Peer to peer computer network is a model in which each personal computer can use the resource on another personal computer, or provide resources to other computers. in other words can function as a client and a server in the same period. This method of peer to peer in windows called workgroup. Each computer in a network are grouped in one working group.

History of Computer Networking

2011-11-17T00:49:00.000+07:00

History of Computer Networking. Three centuries ago, each has a dominance of different centuries. 18th century was dominated by the development of a mechanical system that accompanied the industrial revolution. 19th century is the era of steam engines. the 20th century was dominated by the technology of radio, television and computers. in the 20th century held the role of computers for data collection and data processing. in the 21st century computer network technology capable of reaching all areas of the world. development of technology systems that are used to mark the beginning of the century millennium. since the internet was introduced and marketed Windows 95 operating system by Microsoft, to connect multiple computers to be an easy thing. computer can connect to a (LAN) Local Area Network or (WAN) Wide Area Network.

Computer Networking

2011-11-17T00:21:00.000+07:00

The computer networks is the set of "interconnection" between two or more autonomus computer connected to the wired or wireless transmission. Two computers can be said to be connected if they can exchange data or information, and sharing resources owned. Computer, printer, or other peripherals that are connected in a network of computers called nodes. a computer network comprising at least two computers. In the computer networking system known connections between nodes is Peer to Peer and Client Server

Computer Networking