Network medium 015 028 the network medium is the

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Network Medium 0:15-0:28 The network medium is the physical hardware that connects network devices together and allows them to communicate with each other. There are actually quite a few different types of network media, the most common of which is copper wiring. Copper Wiring 0:29-0:43 Copper wiring uses electrical impulses to transmit binary computer data from one device to another.Copper wiring is usually implemented in the form of twisted pair cables and RJ45 connectors.However, some networks use coaxial cables. Fiber Optic 0:44-0:58 Another common network medium is fiber optic cables. Instead of electrical signals, fiber optic cables use light pulses to transmit data across the network. Fiber optic cables can transfer information much faster than copper wiring. Wireless 0:59-1:26 Different than the previous two network media types is the wireless network medium. Networks that use wireless communication typically use analog radio signals to transmit data between devices.However, another type of wireless communication method is by using infrared light to transmit data. This is similar to fiber optic communication but with infrared there is no cable between the two devices and this brings up an important point about network media. Bounded vs Unbounded 1:27-2:05 Network media can be categorized into two general groups, bounded or unbounded. If a network medium is bounded it means there is a physical boundary that contains the communications. For example, copper wiring uses a cable made of plastic sheaths to contain communications. Fiber optic cables use reflective material and protective casings. An unbound network medium doesn't have any type of physical casing. Instead, the radio waves or light waves are transmitted through the air. A good way to remember the two is that bounded media use cables, unbounded media do not. Connectivity Devices 2:06-2:28 In addition to the network medium, networks use special components called connectivity devices to connect computers to a network and also control the flow of data through a network. Let's take a look at how this is done. In this example network, we have four computers. Each of these computers needs to be able to connect to the network somehow, this is the job of the network interface card or NIC. NIC 2:29-3:21 Network interface cards are sometimes installed in an expansion slot but most NICs are integratedwith the computer's motherboard. Now, the NIC alone can't do much. It allows a network cable to connect to the computer but the other end of the cable needs to connect to something. Now it's possible for the other end of the cable to be connected to one of these computers. This would allow these two computers to communicate with each other. However, two computers communicating isn't much of a network. What we need is a single device to which all these computers can connect.
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