![]() Actually the router we know is actually different from the ones the ISP use.The routers used by ISP actually acts a point or a node which connects other routers from other ISPs So usually the router is used when we are connecting two networks together. This is specially used in cell phone networks However for the WAP to communicate with the device it must have WNIC This provides the NIC function in a wireless networkĪ central device used to connect device to a wireless network It contains a hard coded MAC address which is a 48 bit code in hexadecimals ![]() This is not a device but actually a component in a device which uniquely identifies a device on the internet. Is a computer which provides a specific service or an application ![]() This causes data collisions and thus corruptions The hub is also used as a central device but the message is usually send to all the other devices. The switch is the advanced version of the hub as it provides more features than the hub. So for commmunications within a particular network such as a WAN we don't need a router. It records the Network addresses of the devices in each connected segment.įor example if we want to extend a bus topology with a star topology we could use a bridge and a repeater to produce a larger LAN and a hybrid network.Ī central device which is used to connect devices in a star topology which can send a unicast message The reason why the word amplifier is wrong is that a amplifier boost both the interference and the signal whereas the repeater boosts the signal only.Ī device which connects two segments of LAN. We must know in depth the functions of each deviceĪ device connecting two wires which provides a full strength signal to the second wire. There are many devices or hardwares in a particular network and they have there own functions This delay is called latency LAN Hardware Usually the main reason why we don't use Satelites is because they are highly expensive and difficult to maintain and also as they are very far away they have a delay in transmission. Thus this is used in high speed telecommunciations and internet communications. The Low earth orbit satelites has the lowest orbital radius. This is called medium earth orbit satelites which is used for GPS and 10 are required for global coverage These are satelites which has an orbital period of one day and it is about 35000km above the surface of the earth.Īlso the satelite will positioned above the same point above the earth always.ģ are required to enable global coverage and is usually used for long distance telephone communications or networks There are 3 types of satelites depending on their positions Instead of using wired transmission for world wide communications we can use satelites which uses wireless transmission (microwaves). Wired transmission is used for internet communications and also telephone communications Satelites It is used in Lan networks to reduce the amount of cabling but usually we use twisted pair for LAN networks Wireless transmission is used in connecting mobile phones to the WAP For this reason we use infrared only for short range transmission Practical uses of Wireless and Wired transmission Understand that infrared has a short range compare to microwaves and radiowaves. There is no clear trend for interference, however wireless transmission has more interference than wired transmissionĪlso the need for repeaters is less often used than for wired transmissionĭepending on the situation the type of wireless transmission used depends ![]()
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