Buy Dideo Subscription
Understand what is a computer networking? What are the four pillars of Computer Networking ? Well, computer networking is Communication between two or more computing devices. Example of Computing Devices are :- • Desktop PC • Laptop PC • Mobile Devices • Network Camera • Network Printers Or any other device that can receive and transmit data over a network To happen networking, following four things are mandatory. 1) Transmission Media 2) Network Addresses 3) Protocol and 4) the Topology Let’s understand in brief about transmission media. transmission media may be wired or wireless. Wired transmission media include:- Ethernet Cable (Here, in the photo we can see the short Ethernet cable. This is the cable that we generally use in the Local Area Network for wired network connection. The one end of the cable is generally connected to your router or switch and the another end is connected to your Laptop or Desktop PC. Likewise, Coaxial Cable, it is the cable that we traditionally used to get TV signal. But in networking it is used generally for Wide Area Network. That means from your Internet Service Provider to your home router. • And, Optical Fiber. It works on the basis of light signal. It is also used in the Wide Area Network or the campus network. That means from your Internet Service Provider to your home router. In the campus network, optical fiber may also be used to connect between Switches or routers that are in the long distance. Wireless transmission media works on the basis of Radio Frequency. Some examples of common wireless technology includes • Wi-Fi • Bluetooth • Infrared • Satellite • Or any other technology that works on the basis of Radio Frequency (RF) The second essential thing to happen networking is Network Addresses. There are two types of Network Addresses. The one is Media Access Control (MAC Address) and the other is Internet Protocol Address or the IP Address. We will have separate session about what MAC address is and what is IP address. The third thing that is necessary to happen computer networking is Protocol. Protocol is defined as a set of rules to allow communication. While data transmitting from source to destination, it follows so many set of rules or the protocols. There are thousands of network protocols that are developed to make communication systematic and secured. For example Internet Protocol version 4 (IPv4) address range can be from 0 to 255. If you assign an IP number greater than 255 to a device, it will not accept. Because the protocol doesn’t allow this. Let’s see it practically. Type Windows + R key to open Run. Type ncpa.cpl and hit enter. It takes you to the Network Connections. Right click and click on Properties. Double click on IPv4, click on Use the following IP Address. And give IP address greater than 255, let’s give 270. As we can see, it does not accept the address and the message reads, 270 is not a valid entry. Please specify a value between 1 and 223. But, it’s limiting from 223 because it’s the last number of Class C address range which can be assigned to hosts. From 224 to 255 are used for different purposes. It’s the rule of the Internet Protocol. We will deep dive into the classes of IPv4 addresses in the later sections. But for now, I have shown this to make you understand about a protocol. Other common Protocols:- DHCP, DNS, HTTP, FTP, etc. We will have separate video about these common protocols. Now, the fourth pillar of computer networking is Topology. Topology defines how data flows from source to destination. There are so many types topologies in Networking that you might have heard before such as start topology, Bus topology, etc. But generally, they are represented as Physical Topology and the Logical Topology. Physical Topology defines Physical connection of computing and networking devices and the transmission media. We can also take networking diagrams as the physical topology because they are physically connected in a diagram and configured in the devices. The Logical Topology is Configuration on the networking devices that tells how to flow data from a source to a destination. For example: - path determination. There may be multiple routes to transmit or receive data from source to destination. But the data travels as per the configuration in the networking devices. This is called logical topology that defines how to flow data from a source to a destination. Okay guys, these are the most essential things to happen networking. Hope the information was useful to you. That’s all for now. Thanks for watching this video, see you in the next, until then, have a nice time good bye !
