What is a Firewall | Computer & Networking Basics for Beginners | Computer Technology Course скачать в хорошем качестве

What is a Firewall | Computer & Networking Basics for Beginners | Computer Technology Course

What is a Firewall, Computer & Networking Basics for Beginners, Computer Technology Course In terms of computer security, a firewall is a piece of software. This software monitors the network traffic. A firewall has a set of rules which are applied to each packet. The rules decide if a packet can pass, or whether it is discarded. Usually a firewall is placed between a network that is trusted, and one that is less trusted. When a large network needs to be protected, the firewall software often runs on a computer that does nothing else.A firewall protects one part of the network against unauthorized access. Different kinds of Firewalls: Packet filtering / Network Layer Data travels on the internet in small pieces; these are called packets. Each packet has certain metadata attached, like where it is coming from, and where it should be sent to. The easiest thing to do is to look at the metadata. Based on rules, certain packets are then dropped or rejected. All firewalls can do this. It is done at the network layer.Stateful packet inspectionIn addition to the simple packet filtering (above) this kind of firewall also keeps track of connections. A packet can be the start of a new connection, or it can be part of an existing connection. If it is neither of the two, it is probably useless and can be dropped.Application-layer firewalls do not just look at the metadata; they also look at the actual data transported. They know how certain protocols work, for example FTP or HTTP. They can then look if the data that is in the packet is valid (for that protocol). If it is not, it can be dropped.Types of firewalls: In general, there are two types of firewalls: • Software-based firewalls: these are often run as additional programs on computers that are used for other things. They are often known as personal firewalls which can be updates on personal computers. • Hardware-based firewalls: Hardware based firewalls run on a dedicated computer (or appliance). Often, these offer a better performance than software firewalls, but they are more expensive. ....... Our Mantra: Information is Opportunity. Knowledge is Power. Be Informed - Be Powerful! SUPPORT US: SUBSCRIBE / LIKE / SHARE / COMMENT :) Subscribe Link: https://goo.gl/qbyzFb ....... CONNECT US: Website: http://www.simplyinfo.net Facebook:   / simplyinfo.net   Twitter:   / simplyinfo9   YouTube:    / simplyinfo9   Slideshare: https://www.slideshare.net/SimplyInfo9 Pinterest:   / simplyinfo9   Instagram:   / simplyinfo9   YouTube Subscribe Link: https://goo.gl/qbyzFb ....... OTHER PLAYLISTS TO EXPLORE: Games & Sports: https://goo.gl/uTXRWB Jobs & Career Info: https://goo.gl/cbCDXy Business Management: https://goo.gl/1sDjfW Information Technology: https://goo.gl/nWYpK8 Physics Concepts: https://goo.gl/FnLmes Education & Learning: https://goo.gl/54TR8A Filmmaking Concepts: https://goo.gl/RQL5qn Psychology Concepts: https://goo.gl/oYNNKA Indian Law Concepts: https://goo.gl/m98pWn Economics Concepts: https://goo.gl/yymX98 ....... About Simplyinfo.net: We provide the best info bytes videos in a very simple and effective way to learn, to revise and to master micro-content information. We simplify information in a wide variety of categories. Contact Us: simplyinfo9@gmail.com Be Blessed with Love, Health & Happiness. Cheers & Have Fun :) Team SimplyInfo.net P.S. CLICK BELOW LINK TO SUBSCRIBE FOR UPDATES. SUBSCRIBE LINK: https://goo.gl/qbyzFb