Networking of Computer |Ethical Hacking Free Course – Part 2
Ethical Hacking Free Course: Episode 2; Everything about computer networking!
Imagine, if you were the only person in the world, would you have to tension over something? You had no fear of losing anything, no desire to get anything, no greed, longing, and restlessness. May always be pleased with the Creator, to give you such a gift! In the computing world, if there was no “networking” term, many modern computing techs would not even be imagined, such as the Internet! As soon as all the problems are connected to many computers at the same time, the bad guys will try to break your security, and security specialists will become very essential. Without networking of computer terms, the hacking terms might not have even been heard. As you can see from the above example, there is so much competition in the world, there is so much competition, so much jealousy. I’m going to start from the bottom up, and that is computer networking. But I will try to arrange the whole course a little differently. When discussing networking, that does not mean that I will only publish serial episodes about networking hacking! To discuss the network, I might go through WiFi, then switch to WiFi security testing, then switch to a different term of networking, then maybe switch to the web server related topic. Control the entire course in such a way that you never lose interest! Why not study in the house! So, hopefully, you have a rough idea of the course’s next episodes! Let’s go straight to the computer networking without having to say anything unnecessary…
When multiple computers start working together in the same protocol, it is simply a simple computer of networking or. Whenever you try to connect another computer to another computer or try to talk, you must create a network. You also do networking while transferring files or songs from one phone to another using Bluetooth. So it’s just as easy to understand the water, computer networking is born only by adding multiple computers to the same network. However, there are some profound things to note. Think about it, when you’re adding another computer to one computer, there are more things coming up! First of all, the computer itself is a term, then how they are connected among themselves. If connected via cable, then a wireless network and if not connected to a wireless network.
Two computers may be able to connect directly to one another by making direct connections, but if the number of computers is increased, then a third-party device will be needed, which will maintain all the connections. For example, you can easily connect one or two plugs directly to a wall socket, but if a TV, fridge, mobile, laptop charger is required to connect together, then multi-plugs are required. In networking, routers, hubs, and switches do the same.
This time Bass put the computers in one connection, but technically the network will not be built, unless computers start working on the same protocol, every computer must understand everyone’s language. Suppose I speak Bengali and you say Chinese, will the communication between you and me ever be possible? Another hardware part that helps complete networking is the network card on your computer. Previously, it was needed to be isolated, but now it is dedicated to all computers.
IP Address And Computer network
Now suppose you have joined multiple computers into one network, but how does a particular computer interact with a particular computer? Suppose you have added 10 electric device to a multi-plug, now if you give current to it, each device will receive current. But if you want to provide a specific current to a specific electric device, it is important to have an identity of the connected device. The same is true of computer networking. An IP address is the virtual identity of a computer, making it easier to find any computer connected to the network.
An IP address, usually “22.214.171.1241” – looks like this. But there may be different types of IP addresses and the type may also change numerically. So we will work according to the above reference. First, we connected the computers together to the network and now we have the unique identity of all the computers, that is, it can be possible to send special data or commands to any particular computer.
Now, of course, there are two separate areas of computer networking. If you make a network in your home or office by connecting the wires together or wirelessly, it will be called a local network. If you combine your local network with thousands of external networks, that is what the Internet is called. I will not say anything more about the details of the internet, I have published the article AlReady Best, you can read it. Local networks and the Internet work much the same way, but things are different. For example, when you are at home, you sit there, because of your home, right? Again, when you are out, or in the office, there is another rule you have to follow because there is somebody else sitting.
The IP address I mentioned above is IP version 4 – that already is over. When you are connected to the Internet, of course, it means that you are connected to millions of devices. But there must be a unique address, right? Bat version 4 is over. We are addressing this IP4 deficit using a network address translation process. There is a dedicated post with an IP address, which is a must-see!
As I said before, there are many types of IP addresses, and the rules are all different for networking. Private IP, Public IP, Static IP, and Dynamic IP. Private IP is the IP address used by your local network. As I said earlier, IP4 is over, but if you use an IP on a private network that is on a different or another network device, nothing will happen to your network. Why not own network, own rules! 10.0.0.0 to 10.255.255.255 | 172.16.0.0 to 172.31.225.255 | And these range IPs are used as private IPs – from 192.168.0.0 to 192.168.255.255. Now in the meantime, your computer may be the private IP of “192.168.0.10” but this is not your Internet IP, it is your own IP. No public IP is required to be connected to the Internet.
Public IP is the IP that the Internet Service Provider provides you. You turn on the computer, and you are connected to the Internet, what does that mean? This means that you have connected your Internet Service Provider’s computer, and received a public IP from it. Friends, this is where network address translation or NAT is used. Your router only accepts public IPs and hides private IPs from your local or home network. The router provides a private IP to all connected devices, and when requested from a computer to the Internet, the router receives the request and sends it to the public IP. Asha’s request comes back to the router from the public IP, the router sends it to the private IP of your computer, because the router knows exactly where the private IP request came from, and where to send it! Do you understand? This is how the Internet has been kept alive using NAT.
Dynamic IP | Static IP
Most public IP addresses change. That means once you connect the Internet, you are given a public address, but when you disconnect and reconnect you are given another public IP, especially mobile operators do more of this. So if an IP is changed, then it is called dynamic IP. Suppose you are not using the Internet, then you do not need to keep it with the public IP? This ISP gives the other customer that IP. There is a shortage of IP addresses, you understand!
However, if you want to host a website, a static IP address is required. If the IP continues to change, no one will be able to contact your computer. And websites are hosted on the same computer as your computer. Just like your home network is connected to public IP and gets internet access, the server network also has to be connected to public IP. Got it, it’s the same everywhere. If you wish to receive courier service regularly in your home, then a specific and non-permanent address will be required. If the address is going to change, tell me how to find your home again and again.
Websites use domain names (such as wirebd.com) directly without IP, which is often easier to remember and has many benefits. But it is not possible to connect a computer without IP. So when you enter the domain name into the browser, the browser starts searching for the DNS or domain name server. The DNS contains that information, which domain is targeted to that IP, after which the site is loaded from Just 1 IP. The World Wide Web article can be found in more detail.
The advantage of having a domain name is that it is easy to remember and DNS can be changed. That means if you transfer a site from one server to another, that means the IP address is changed only if you change the DNS to a site, there is no need to change the site name. The user does not understand whether the server has been changed. But updating your ISP DNS record can be a little late, so if the IP behind the domain changes, then the previous IP without getting that IP from the record goes down, so the site may be down. That’s why you can’t get in once after changing the WireBD server.
Local Area Network (LAN)
Although you have a good idea about LAN from the above discussion, it is important to have a little discussion! As I mentioned earlier, computers that are physically close to each other and are connected to each other via wireless or wireless networks are called LANs. Connections within the LAN can be made using Ethernet cable, or WiFi, and routers, hubs, switches, etc. are required.
Devices are connected directly to each other on the LAN. Any device can make a connection to any device and send or receive data, called a peer-to-peer network, to tell how the Torrent Network works. But a large network like the Internet does not work like this, there is a central web server computer, any request goes to the server first, then the file/webpage goes to the client computer.
Now the question is, how much is it possible to create this local area network? It is possible to create a local area network from two devices to thousands or millions of devices, but even if there are millions of devices you cannot connect to the rest of the world. But the local network of millions of devices can be called your own Internet.
Wide area networks
As mentioned earlier, there are many types of computer networking, and the role and importance of each one are different, the Wide Area Network is one of them, you can call the Internet WAN. Here WAN refers to the computer network at a distance. The computer of the Internet networking is spread all over the world. The network device connects the router, the LAN, and the WAN together. That means when you are connected to the Internet from the local network, it means you make a connection to the WAN. But WanQue cannot be called the complete Internet. Suppose you have created a bank network, each bank has a local network and bank branches are spread over different parts of the city. But how long can it be called the internet, as long as you connect to this van with a connection from an ISP? So you can say, ISP provides internet connection in any LAN or WAN.
Types of Network | Computer network, such as;
- WLAN – Wireless Local Area Network
- MAN – Metropolitan Area Network
- SAN – Storage Area Network, System Area Network, Server Area Network, or occasionally Small Area Network
- CAN – Site Area Network, Switch Area Network, or sometimes Group Area Network
- PAN – Personal Area Network
Wireless Local Area Network is largely dependent on WiFi or separate wireless technologies, which can be called WAN over a LAN. The Metropolitan Area Network may be spread over several locations, ranging from LAN to smaller but smaller to WAN. When connected to a database or storage-specific computer networking using Fiber Channel technology, it is called a SAN or storage area network. Cluster area networks can be created by connecting large and high configured computers together into a network.
So this was the second part of the Basic Part 1 course for all things networking. Finishing today’s course here, because I pulled too long, maybe a lot of information was already known to you, but even then it is better to practice once. Some Practical Issues will be shown in the Networking of computer Part II. For example, finding the IP of the network card below, finding the local IP, using the DNS tool and the details and practical discussions, we will see how to create a static IP from the dynamic IP, with the MAC address details in the front! Hope you will definitely learn something interesting there! Let me know what the course of this episode looked like. Please note below if you have any questions!
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