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  A firewall is a software or hardware system designed to prevent unauthorized access to an individual computer or network of computers. They are used mostly as a first line of defense to protect your device or network from online threats such as hackers, viruses, Trojans, and worms. Every time you are connected to the Internet, your computer is exposed to all sorts of dangerous programs and malicious people that want to infiltrate your computer to steal your personal information, send spam emails to your inboxes, or use your computer to launch attacks on other computers. A good firewall system blocks attackers from trying to infiltrate your system and prevents your data and information from flowing out to the bad guys. Like a brick wall, a firewall acts as a barrier to protect your computer from online threats Fire walls have a similar function as the drawbridge and the portcullis grate in front of the entrance on a medieval castle-controlling who can go in and out. While a castle h

Hub:- A hub is basically a multiport repeater A hub connects multiple wires coming from different branches, for example, the connector in star topology which connects different stations. Hubs cannot filter data, so data packets are sent to all connected devices, they do not have the intelligence to find out the best path for data packets which leads to inefficiencies and wastage. Types of Hub Active Hub: These are the hubs that have their own power supply and can clean, boost, and relay the signal along with the network It serves both as a repeater as well as a wiring center. These are used to extend the maximum distance between nodes.  Passive Hub: These are the hubs that collect wiring from nodes and power supply from the active hub. These hubs relay signals onto the network without cleaning and boosting them and can't be used to extend the distance between nodes. Intelligent Hub: It works like active hubs and includes remote management capabilities. They also provide flexible