{"id":98333,"date":"2024-07-18T11:32:00","date_gmt":"2024-07-18T09:32:00","guid":{"rendered":"https:\/\/firstcolo.blackpeppers.de\/glossary\/firewall\/"},"modified":"2026-03-12T23:53:14","modified_gmt":"2026-03-12T22:53:14","slug":"firewall","status":"publish","type":"glossary","link":"https:\/\/firstcolo.blackpeppers.de\/en\/glossary\/firewall\/","title":{"rendered":"Firewall"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"98333\" class=\"elementor elementor-98333 elementor-55106\" data-elementor-post-type=\"glossary\">\n\t\t\t\t<div class=\"elementor-element elementor-element-544f42cc e-flex e-con-boxed e-con e-parent\" data-id=\"544f42cc\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-36854181 e-con-full e-flex e-con e-child\" data-id=\"36854181\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-7cc2500d e-con-full e-flex e-con e-child\" data-id=\"7cc2500d\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-4c6d2a26 e-con-full e-flex e-con e-child\" data-id=\"4c6d2a26\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-788a5ecc elementor-widget elementor-widget-heading\" data-id=\"788a5ecc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">What is a firewall?<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2a39d74 elementor-widget elementor-widget-text-editor\" data-id=\"2a39d74\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>A firewall is a security system that protects computers and networks from unauthorized access. This is done by monitoring data traffic between the local computer and external networks such as the internet. Its primary task is to defend against malicious software such as viruses or spyware, as these could attempt to steal sensitive data or disrupt computer systems.  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2138ebe7 e-flex e-con-boxed e-con e-parent\" data-id=\"2138ebe7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6c9b339c elementor-widget elementor-widget-heading\" data-id=\"6c9b339c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How it works<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-462b17b3 elementor-widget elementor-widget-text-editor\" data-id=\"462b17b3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>The firewall acts as a control instance: it checks access permissions for programs and external computers. It decides which data packets are allowed through and which are blocked. The configuration determines whether programs are allowed to access the internet. The firewall also regulates communication between computers on the network.   <\/p><p>Firewalls do not initially distinguish whether access is malicious; instead, they act based on predefined rules. These relate to: <\/p><ul><li><strong>Access permissions<\/strong>: By default, firewalls block external IP addresses that request access. Users can manually add exceptions. <\/li><li><strong>Installation prompts<\/strong>: Programs that access the internet require confirmation. This ensures that the firewall prevents malware from being installed. <\/li><li><strong>Network visibility<\/strong>: In public networks, it can reduce the computer\u2019s visibility to make attacks more difficult.<\/li><li><strong>Blocking active content<\/strong>: Technologies such as ActiveX or Flash can be blocked to prevent potentially harmful content from being executed.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-258864c elementor-widget elementor-widget-heading\" data-id=\"258864c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Ports<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5d4c8600 elementor-widget elementor-widget-text-editor\" data-id=\"5d4c8600\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Firewalls regulate data traffic via ports. Each program uses specific ports, which can be opened or closed as needed. This prevents unwanted data traffic, but it can also lead to program errors if required ports are not enabled.  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5d12af3 elementor-widget elementor-widget-heading\" data-id=\"5d12af3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Types<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-284eedcf elementor-widget elementor-widget-text-editor\" data-id=\"284eedcf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>There are two main types:<\/p><p>The <strong>personal firewall<\/strong> is installed on the computer, monitors data traffic, and prevents unauthorized access. It is often part of the operating system. <strong>External firewalls<\/strong>, on the other hand, are positioned between the home network and the internet: they analyze incoming traffic and stop threats before they reach the network. Typically, these firewalls are integrated into a router.  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0109398 elementor-widget elementor-widget-heading\" data-id=\"0109398\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Limitations<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-078efd4 elementor-widget elementor-widget-text-editor\" data-id=\"078efd4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Although firewalls provide basic protection, it is advisable to combine them with antivirus software. This detects and blocks malware based on up-to-date virus definitions, providing more comprehensive protection. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-66ea52af e-con-full e-flex e-con e-child\" data-id=\"66ea52af\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3f71507a elementor-widget elementor-widget-button\" data-id=\"3f71507a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Home<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-318dde8f elementor-widget elementor-widget-button\" data-id=\"318dde8f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/firstcolo.blackpeppers.de\/en\/knowledge\/glossary\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Glossary<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>What is a firewall? A firewall is a security system that protects computers and networks from unauthorized access. This is done by monitoring data traffic between the local computer and external networks such as the internet. Its primary task is to defend against malicious software such as viruses or spyware, as these could attempt to [&hellip;]<\/p>\n","protected":false},"author":43,"featured_media":97354,"menu_order":0,"template":"","meta":{"content-type":"","footnotes":""},"glossary-categories":[],"glossary-tags":[],"class_list":["post-98333","glossary","type-glossary","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Firewall | firstcolo Glossary<\/title>\n<meta name=\"description\" content=\"A firewall is a security system that protects computers and networks from unauthorized access and malware.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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