{"id":770,"date":"2021-07-17T19:21:08","date_gmt":"2021-07-17T19:21:08","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=770"},"modified":"2021-09-11T07:05:52","modified_gmt":"2021-09-11T07:05:52","slug":"what-is-firewall","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/networking\/what-is-firewall\/","title":{"rendered":"What is firewall ?"},"content":{"rendered":"<div class=\"TextHeading\">\n<div class=\"hddn\">\n<h2 id=\"what-is-firewall\" class=\"color-pink\" style=\"text-align: justify;\">What is firewall ?<\/h2>\n<ul style=\"text-align: justify;\">\n<li>A\u00a0<a href=\"https:\/\/www.wikitechy.com\/technology\/how-to-get-firewall-access-on-android-without-root\/\" target=\"_blank\" rel=\"noopener\">firewall<\/a>\u00a0is a piece of hardware or software that helps prevent malware and malicious attacks from entering a computer or a network of computers through the\u00a0<a href=\"https:\/\/www.wikitechy.com\/technology\/free-internet-tricks-2017\/\" target=\"_blank\" rel=\"noopener\">Internet<\/a>.<\/li>\n<li>Firewalls have been a first line of defense in network security for over 25 years. They establish a barrier between secured and controlled internal networks that can be trusted and untrusted outside networks, such as the Internet.<\/li>\n<li>A firewall can be hardware,software or both.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"text-center row\" style=\"text-align: justify;\"><\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"hardware-firewalls\" class=\"color-green\">Hardware firewalls<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Hardware firewalls are systems that are independent of the computers they protect that filter the Internet as information passes into a computer.<\/li>\n<li>Most broadband Internet routers have their own firewall built in.<\/li>\n<li>In general, hardware firewalls work by examining the data that flows in from the Internet and verifying whether that information is safe.<\/li>\n<li>The ZyXEL ZyWALL, which is a Unified Security Gateway with a firewall and other security features.<\/li>\n<li><b>Cost:<\/b>\u00a0$100 to ~$500<\/li>\n<li>NAT, DCHP, Email Notification.<\/li>\n<li>Easier for computers to locally share folders\/Printers.<\/li>\n<li>Additional function available & can protect other devices.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"ImageContent\" style=\"text-align: justify;\">\n<div class=\"hddn\"><img decoding=\"async\" class=\"img-responsive center-block aligncenter\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/networking\/hardware-firewalls.png\" alt=\"zyxel firewall\" \/><\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"software-firewalls\" class=\"color-green\">Software firewalls<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Software firewalls are designed to protect a computer by blocking certain programs from sending and receiving information from a local network or the Internet.<\/li>\n<li>The Windows Firewall, an example of a firewall software program included with Microsoft Windows.<\/li>\n<li><b>Cost:<\/b>\u00a0Free to $30 per computer.<\/li>\n<li>Each machine need to be configured.<\/li>\n<li>Firewall may be interfere with local network sharing.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"ImageContent\">\n<div class=\"hddn\" style=\"text-align: justify;\"><img decoding=\"async\" class=\"img-responsive center-block aligncenter\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/networking\/software-firewalls.png\" alt=\"Software firewall\" \/><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Answer : A firewall is a piece of hardware or software&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4590],"tags":[195,201,4609,360,221,203,199,363,4908,15908,4606,205,4903,4907,4890,4893,4915,4895,4891,4904,4889,222,362,4892,4900,4902,196,212,213,4911,710,4913,207,4605,366,4905,4912,4896,204,217,288,367,483,206,4894,4910,4608,200,4898,197,4607,4909,4888,4897,4901,4906,4899],"class_list":["post-770","post","type-post","status-publish","format-standard","hentry","category-networking","tag-accenture-interview-questions-and-answers","tag-allstate-solutions-pvt-ltd-interview-questions-and-answers","tag-applied-mate-interview-questions-and-answers","tag-atos-interview-questions-and-answers","tag-bharti-airtel-interview-questions-and-answers","tag-capgemini-interview-questions-and-answers","tag-casting-networks-india-pvt-limited-interview-questions-and-answers","tag-ciena-corporation-interview-questions-and-answers","tag-comodo-firewall","tag-comodo-india-interview-questions-and-answers","tag-css-corp-pvt-ltd-interview-questions-and-answers","tag-dell-international-services-india-pvt-ltd-interview-questions-and-answers","tag-firewall","tag-firewall-definition","tag-firewall-device","tag-firewall-examples","tag-firewall-protection","tag-firewall-security","tag-firewall-software","tag-firewalls","tag-firewalls-types","tag-flipkart-interview-questions-and-answers","tag-hcl-technologies-interview-questions-and-answers","tag-how-does-a-firewall-work","tag-how-does-a-hardware-firewall-work","tag-how-firewall-works","tag-ibm-interview-questions-and-answers","tag-indecomm-global-services-interview-questions-and-answers","tag-infosys-technologies-interview-questions-and-answers","tag-managed-firewall","tag-mavenir-interview-questions-and-answers","tag-microsoft-firewall","tag-mphasis-interview-questions-and-answers","tag-ncr-corporation-interview-questions-and-answers","tag-netapp-interview-questions-and-answers","tag-network-firewall","tag-network-firewall-security","tag-network-firewall-software","tag-oracle-corporation-interview-questions-and-answers","tag-peoplestrong-interview-questions-and-answers","tag-r-systems-interview-questions-and-answers","tag-rbs-india-development-centre-pvt-ltd-interview-questions-and-answers","tag-reliance-industries-ltd-interview-questions-and-answers","tag-sap-labs-india-pvt-ltd-interview-questions-and-answers","tag-software-firewall-definition","tag-stateful-firewall","tag-tata-communications-interview-questions-and-answers","tag-tech-mahindra-interview-questions-and-answers","tag-types-of-firewall","tag-unitedhealth-group-interview-questions-and-answers","tag-virtela-interview-questions-and-answers","tag-virtual-firewall","tag-what-is-a-firewall-on-a-computer","tag-what-is-firewall","tag-what-is-firewall-in-networking","tag-windows-firewall","tag-working-of-firewall-with-diagram"],"yoast_head":"<!-- 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