{"id":2640,"date":"2018-01-12T16:17:31","date_gmt":"2018-01-12T16:17:31","guid":{"rendered":"https:\/\/old.staging-teachcomputerscienceuk.kinsta.cloud\/?p=311"},"modified":"2024-07-24T11:20:13","modified_gmt":"2024-07-24T11:20:13","slug":"firewalls","status":"publish","type":"post","link":"https:\/\/teachcomputerscience.com\/firewalls\/","title":{"rendered":"Firewalls"},"content":{"rendered":"<div class=\"gb-container gb-container-9a5d9069 upsell-block\"><div class=\"gb-inside-container\">\n<div class=\"gb-grid-wrapper gb-grid-wrapper-e2e9a315\">\n<div class=\"gb-grid-column gb-grid-column-742f301f\"><div class=\"gb-container gb-container-742f301f\"><div class=\"gb-inside-container\">\n\n<h2 class=\"gb-headline gb-headline-96b65b15 gb-headline-text\">KS3 Internet Security Resources (14-16 years)<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>An editable PowerPoint lesson presentation<\/li><li>Editable revision handouts<\/li><li>A glossary which covers the key terminologies of the module<\/li><li>Topic mindmaps for visualising the key concepts<\/li><li>Printable flashcards to help students engage active recall and confidence-based repetition<\/li><li>A quiz with accompanying answer key to test knowledge and understanding of the module<\/li><\/ul>\n\n\n<div class=\"gb-button-wrapper gb-button-wrapper-3449eb5a\">\n\n<a class=\"gb-button gb-button-f0689a07 gb-button-text\" href=\"https:\/\/teachcomputerscience.com\/ks3\/networking\/internet-security\/\">View KS3 Internet Security Resources<\/a>\n\n<\/div>\n<\/div><\/div><\/div>\n\n<div class=\"gb-grid-column gb-grid-column-72384cc2\"><div class=\"gb-container gb-container-72384cc2\"><div class=\"gb-inside-container\">\n\n<h2 class=\"gb-headline gb-headline-60c442cf gb-headline-text\">A-Level Network Security Resources (16-18 years)<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>An editable PowerPoint lesson presentation<\/li><li>Editable revision handouts<\/li><li>A glossary which covers the key terminologies of the module<\/li><li>Topic mindmaps for visualising the key concepts<\/li><li>Printable flashcards to help students engage active recall and confidence-based repetition<\/li><li>A quiz with accompanying answer key to test knowledge and understanding of the module<\/li><\/ul>\n\n\n<div class=\"gb-button-wrapper gb-button-wrapper-130f6807\">\n\n<a class=\"gb-button gb-button-52adf96b gb-button-text\" href=\"https:\/\/teachcomputerscience.com\/a-level\/exchanging-data\/network-security\/\">View A-Level Network Security Resources<\/a>\n\n<\/div>\n<\/div><\/div><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A firewall<\/strong> is a security system developed to block a\u00a0connection\u00a0to or from a private\u00a0network. \u00a0Firewalls can be enforced as either hardware or software or a combination of both hardware and software.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Network firewalls are utilised to prohibit unauthorised&nbsp;internet&nbsp;users from accessing private networks or intranets connected to the internet. &nbsp;All messages passing through the intranet, whether coming in or getting out goes through the firewall.<br>The firewall inspects each message and rejects messages that failed from the security&nbsp;checks.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardware and Software Firewalls<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Firewalls enforced can be either hardware or software, but the perfect configuration will contain both. \u00a0Aside from limiting connection to computers and networks, a firewall is also utilised for authorising unknown access to a private network through security authentications.<br>Hardware firewalls can be bought as a separate product, but they are usually included in broadband routers. \u00a0These are regarded as an essential part of system security and network setup. \u00a0Most hardware firewalls possess four network ports to link to other computers. \u00a0Larger networks would require a business networking firewall solution instead.<br>Software firewalls are embedded on computers and can be personalized just like other software programs. \u00a0This lets you manage its function and safety features. \u00a0A software firewall protects your computer from those trying to access your computer illegally.<br>Operating systems also have embedded firewalls. \u00a0Windows Firewall\u00a0is a Microsoft Windows application that detects malicious activities and alerts users. \u00a0The application can spot and block hackers, viruses and worms from inflicting damage to your computer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><b>Firewall Filtering Techniques<\/b><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Firewalls screen all information entering the network and computer system. &nbsp;They are used in the home and office in preserving networks.<br>The following firewall techniques can stop possible harmful information from getting through:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Packet Filter<\/strong> \u2013 screens each&nbsp;packet&nbsp;coming to and from the network and admits or repels it based on rules defined from the start. &nbsp;Packet filtering is efficient and apparent to users, but it is hard to setup. &nbsp;In addition, it is vulnerable to&nbsp;IP (Internet Protocol) spoofing.<\/li><li><strong>Application Gateway<\/strong> \u2013 applies security components to specific applications, such as&nbsp;FTP&nbsp;(File Transfer Protocol) and&nbsp;Telnet&nbsp;servers. &nbsp;This is very efficient, but can inflict a performance decline.<\/li><li><strong>Circuit-level Gateway<\/strong> \u2013 packets can move between the hosts without further checking once the UDP (User Datagram Protocol) or TCP (Transmission Control Protocol) connection has been established. &nbsp;Security components are applied when the connection is built.<\/li><li><strong>Proxy Server<\/strong> \u2013 holds back all messages coming to and from the network. &nbsp;The&nbsp;proxy server&nbsp;masks the true network addresses efficiently.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many firewalls use two or more of these techniques jointly. \u00a0A firewall is regarded as the first line of security in safeguarding private information. \u00a0For better security protection,\u00a0data\u00a0can be\u00a0masked.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><b>Types of Firewall<\/b><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Proxy firewall \u2013 acts as the gateway from one network to another. &nbsp;It stops direct connections from outside the network.<\/li><li>Stateful inspection firewall \u2013 allows or blocks traffic depending on its condition. &nbsp;It monitors all activity throughout the connection.<\/li><li>Unified threat management (UTM) firewall \u2013 offers stateful inspection firewall functionalities plus interference inhibition and antivirus.<\/li><li>Next-generation firewall (NGFW) \u2013 blocks modern threats and application-layer attacks.<\/li><li>Threat-focused NGFW \u2013 offers advanced threat detection and improvements.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><b>Firewalls in the Perimeter-less Age<\/b><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The function of a firewall is to stop detrimental traffic from reaching the resources that it is shielding. \u00a0Some security experts feel this is an obsolete way of keeping information and the resources it resides on safe. \u00a0They contend that while firewalls still have a part to play, modern networks have so many entry points and different types of users that more robust access control and security at the host is a better technological tactic to network security.<\/p>\n\n\n\n<h3 class=\"gb-headline gb-headline-03b3995b gb-headline-text\">Further Readings:<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Firewall_(computing)\" target=\"_blank\" rel=\"noopener\">Firewall (computing)<\/a><\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/teachcomputerscience.com\/wp-content\/uploads\/2019\/08\/070-virus.png\" alt=\"A firewall is a security system developed to block a\u00a0connection\u00a0to or from a private\u00a0network. \u00a0Firewalls can be enforced as either hardware or software, or a combination of both hardware and software.\" class=\"wp-image-5762\" width=\"337\" height=\"337\" title=\"\" srcset=\"https:\/\/teachcomputerscience.com\/wp-content\/uploads\/2019\/08\/070-virus.png 512w, https:\/\/teachcomputerscience.com\/wp-content\/uploads\/2019\/08\/070-virus-150x150.png 150w, https:\/\/teachcomputerscience.com\/wp-content\/uploads\/2019\/08\/070-virus-300x300.png 300w\" sizes=\"auto, (max-width: 337px) 100vw, 337px\" \/><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"<p>A firewall is a security system developed to block a\u00a0connection\u00a0to or from a private\u00a0network. \u00a0Firewalls can be enforced as either hardware or software or a combination of both hardware and software. Network firewalls are utilised to prohibit unauthorised&nbsp;internet&nbsp;users from accessing private networks or intranets connected to the internet. &nbsp;All messages passing through the intranet, whether &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Firewalls\" class=\"read-more button\" href=\"https:\/\/teachcomputerscience.com\/firewalls\/\" aria-label=\"Read more about Firewalls\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[29],"tags":[204,47],"class_list":["post-2640","post","type-post","status-publish","format-standard","hentry","category-security","tag-article","tag-hide-old-upsell","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"acf":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/teachcomputerscience.com\/wp-json\/wp\/v2\/posts\/2640","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/teachcomputerscience.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/teachcomputerscience.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/teachcomputerscience.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/teachcomputerscience.com\/wp-json\/wp\/v2\/comments?post=2640"}],"version-history":[{"count":2,"href":"https:\/\/teachcomputerscience.com\/wp-json\/wp\/v2\/posts\/2640\/revisions"}],"predecessor-version":[{"id":607078,"href":"https:\/\/teachcomputerscience.com\/wp-json\/wp\/v2\/posts\/2640\/revisions\/607078"}],"wp:attachment":[{"href":"https:\/\/teachcomputerscience.com\/wp-json\/wp\/v2\/media?parent=2640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/teachcomputerscience.com\/wp-json\/wp\/v2\/categories?post=2640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/teachcomputerscience.com\/wp-json\/wp\/v2\/tags?post=2640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}