Basic devices for network connection:
Today, we will see which with the basic devices for network connection.
Computer networks are groups of computers connected by a wired structure or by a wireless system, which allows them to share files and services with each other. To achieve a good performance of these networks, it is necessary to have several devices to make the connections and unite our network with other networks, and offer a much more secure and efficient communication system.
Among the so-called basic devices that are used for network design, we have the following:
Modems.
Hubs.
Repeaters.
Bridges.
Routers
Gateways.
Brouters.
Later, we will describe each of these components so that the reader has an idea of what each one is used for.
The popular modems are devices that have the important function of communicating the computer equipment that is part of a network with the outside world, that is, it is the device where the main network cable is connected and that receives the information from the line telephone. These devices can connect multiple networks to each other.
The modem operation is simple. The sending computer or network sends digital signals that are converted to analog signals in the sending modem and travels through telephone lines to its destination, where the receiving modem converts the analog signal back into a digital signal that can be interpreted by a computer.
The modem has a serial communication interface (RS-232) and an RJ-11 telephone line interface. The data transmission rates of current modems range from 57500 bps to 76800 bps.
Another basic device for connecting networks is the Hub. This device allows the network to be expanded to as many computers as we wish, using the star point topology, which consists of dividing the network point into as many outputs as the Hub has.
Hubs receive data through the input connection and offer multiple outputs to connect to multiple computers. In most networks, we can connect Hubs in series to increase the number of teams that can be connected in a network.
When signals are transmitted through cables, they tend to degrade as they go further. This phenomenon can also be seen in wireless networks. Fortunately, there is an answer to this situation, which is to use the famous repeaters.
These devices take the distorted signal from a cable or signal and regenerate it to transmit the network signal or data too much more remote locations, using the OSI reference model.
Repeaters can only work on signals or data packets that work with the same communication protocols, that is, it will be impossible for a repeater to improve the signal of an Ethernet network and send it to a Token Ring network.
Repeaters are devices that must be used to connect remote segments of a LAN network. These do not perform any kind of filtering or re-routing, they only connect network segments and restore degraded signals.
Bridges are devices that have a purpose very similar to that of repeaters, but unlike these, they can divide a network to isolate one wing from it and to carry out the repairs that are required.
Bridges are generally used to:
Extend the length of a network segment.
Increase the number of computers on a network.
Reduce the bottleneck effect of a network.
Split overloaded networks.
Linking physical media
These devices can switch and route the information packets that are transmitted through the communication protocol information exchange network.
There are different types of routers, static, dynamic and broadcast routers, and they can work with cables or wirelessly, increasing the range of these devices that manage to manage all the information that passes to a segment of the network.
Computer networks:
 |
| LAN |
Computer networks are groups of computers connected by a wired structure or by a wireless system, which allows them to share files and services with each other. To achieve a good performance of these networks, it is necessary to have several devices to make the connections and unite our network with other networks, and offer a much more secure and efficient communication system.
Among the so-called basic devices that are used for network design, we have the following:
Modems.
Hubs.
Repeaters.
Bridges.
Routers
Gateways.
Brouters.
Later, we will describe each of these components so that the reader has an idea of what each one is used for.
Modems:
The popular modems are devices that have the important function of communicating the computer equipment that is part of a network with the outside world, that is, it is the device where the main network cable is connected and that receives the information from the line telephone. These devices can connect multiple networks to each other.
The modem operation is simple. The sending computer or network sends digital signals that are converted to analog signals in the sending modem and travels through telephone lines to its destination, where the receiving modem converts the analog signal back into a digital signal that can be interpreted by a computer.
The modem has a serial communication interface (RS-232) and an RJ-11 telephone line interface. The data transmission rates of current modems range from 57500 bps to 76800 bps.
Hubs:
Another basic device for connecting networks is the Hub. This device allows the network to be expanded to as many computers as we wish, using the star point topology, which consists of dividing the network point into as many outputs as the Hub has.
Hubs receive data through the input connection and offer multiple outputs to connect to multiple computers. In most networks, we can connect Hubs in series to increase the number of teams that can be connected in a network.
Repeaters:
When signals are transmitted through cables, they tend to degrade as they go further. This phenomenon can also be seen in wireless networks. Fortunately, there is an answer to this situation, which is to use the famous repeaters.
These devices take the distorted signal from a cable or signal and regenerate it to transmit the network signal or data too much more remote locations, using the OSI reference model.
Repeaters can only work on signals or data packets that work with the same communication protocols, that is, it will be impossible for a repeater to improve the signal of an Ethernet network and send it to a Token Ring network.
Repeaters are devices that must be used to connect remote segments of a LAN network. These do not perform any kind of filtering or re-routing, they only connect network segments and restore degraded signals.
Bridges:
Bridges are devices that have a purpose very similar to that of repeaters, but unlike these, they can divide a network to isolate one wing from it and to carry out the repairs that are required.
Bridges are generally used to:
Extend the length of a network segment.
Increase the number of computers on a network.
Reduce the bottleneck effect of a network.
Split overloaded networks.
Linking physical media
Router:
Routers are perhaps the best-known devices on networks. These devices have the particularity of carrying out the work of a bridge offering a series of extra benefits, such as, for example, the possibility of determining the fastest way to send data through the network and, of course, filtering traffic in a given network segment.These devices can switch and route the information packets that are transmitted through the communication protocol information exchange network.
There are different types of routers, static, dynamic and broadcast routers, and they can work with cables or wirelessly, increasing the range of these devices that manage to manage all the information that passes to a segment of the network.
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