Network Devices

Computer network (the network) is a system that consists of computers that are designed to be able to share resources (printers, CPU), communicate (email, instant messaging), and access to information (web browser).

The purpose of the network is the computer in order to achieve its goals, any part of the computer network may request and provide the service (service). Parties requesting / receiving service is called the client (the client) and that provide / send service called the waiter (server). This design is called a client-server system, and is used in almost all computer network applications.

Two computers, each of which has a network card, then connected via a wired or wireless data transmission medium, and there is a network operating system software to form a simple computer network. If you want to create a computer network that broader scope, it would require additional equipment such as Hub, Bridge, Switch, and Router as an interconnection equipment.

1. HUB

Hub Interface Atar computer, all types of communication can only be passed by the hub. hub is used for a simple network form (eg only to connect multiple computers in a local IP group) when there is an incoming packet to a port on the hub, it will be copied to the other ports on the same hub and all the computers that are connected at the hub the same can read the package. When the hub is a lot of abandoned and replaced with a switch. Reason for this replacement is usually because the hub is the data transfer rate is slower than switches. Hubs and switches have a data transfer rate up to 100 Mbps and even switch has been developed to speed 1 Gbps.

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2. SWITCH

Switch A device that filters / filter and pass (allows through) package in a LAN. switcher works at the data link layer (layer 2) and sometimes at the Network Layer (Layer 3) is based on OSI Model Layer. so it can work for any protocol packets. LAN using the switch to communicate on the network called Switched LAN or the physical ethernet network called Switched Ethernet LANs.

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3. ROUTER

Router Tool in charge to deliver data packets in the network. can be used if the router is connected to at least two different networks so that the settings need to be on the side of a gateway router.Router a place where two or more LAN network to connect. Routers use HEADERS introductory tables and lists (Forwarding Table) to determine the best position to deliver a packet network and also using protocols such as ICMP, HTTP to communicate with other LAN with the best configuration for a path between any two hosts.

Here's the picture:

Router Cisco

AP ROUTER

4. BRIDGE

Definition of a bridge is bekarja at the data link layer of the OSI. Adal bridge tool used on a network that serves to divide a large network into smaller segments. read bridge MAC address (media access control0 of ​​each data packet is received which would then learn dridging table to decide what to do next bridge on the data packets, whether passed or ignored. menpunyai if the switch on their own collision domains on each port, as well as the bridge has a collision domain ttetepi he can also share it on a large collision domain into smaller, dah bridge will only pass packets of data between segments - segment if only segment that is necessary.

 There are three types of network bridges are common:

• Local bridge: a bridge that connects the local network segments.
• Bridge Remote: can be used to make a connection (link) between the LAN to create a Wide Area Network.
• Wireless bridge: a bridge that can combine wired LAN and wireless LAN networks.