HOW DIFFERENT WORK HUB AND SWITCH


Hub and Switch is one of the tools used in building a computer network which the network usually consisting of two or more computers. Usually these tools are used in building a LAN (Local Area Network). Menggukan second device topology is the star topology. Here is an explanation both of these tools.

Ø Hub

Hub is a device on the network that conceptually operates at Layer 1 (Physical Layer). That is, the hub does not filter to translate something, just knowing the speed of data transfer and arrangement of pins on the cable. The workings of this tool is to send a data packet signal to all ports on the hub so that the data packet is received by all computers connected to the hub except the sending computer. Transmitted signal is repeated even though the data packet has been received by the destination computer. This causes the function colossion more common.

For example when there is transmission of data packets from port A to port B and at the same time there is transmission of data packets from port C to port D, there will be a collision (collision) because it uses the same line (same broadcast path) so that data packets will become damaged resulting in retransmission of data packets. If this happens then it happens Collison can interfere with delivery of a new data packet and replicates. This resulted in reduced data transfer speed. Therefore, physically, the hub has LED lights that indicate the collision occurred.

When the data packet is sent through one port on the hub, then the transmission of data packets will be seen and sent to any other port on the hub so that the bandwidth be divided into the existing port. The more available ports on the hub, then the available bandwidth becomes smaller for each port.

This makes the transmission of data on the hub with a lot of ports that are connected to the computer becomes slow.

Ø Switch

Switch is a device on a network that is conceptually located at Layer 2 (Datalink Layer). That is, the switch at the time pengirimkan data follow the MAC address on the NIC (Network Interface Card) so that the switch know to whom this package will be accepted. If any collision is a collision that occurred on the ports that are exchanging data packets. For example when there is transmission of data packets from port A to port B and at the same time there is transmission of data packets from port C to port D, then it will not crash (collision) because the address is different and does not use the same line. The more available ports on the switch, it will not affect the available bandwidth for each port.

When the data packet is sent through one port on the switch, then the transmission of data packets will not appear and was not sent to any other ports so that each port has the full bandwidth. This causes the speed of data transfer more secure.

From the description above can be concluded that the switches better than hubs, both conceptually and in principle the comparison works that can make the collosion.