{"id":118,"date":"2021-06-12T12:14:54","date_gmt":"2021-06-12T12:14:54","guid":{"rendered":"https:\/\/infosec.klbproductions.nl\/?p=118"},"modified":"2021-06-12T12:14:54","modified_gmt":"2021-06-12T12:14:54","slug":"firewalls-explained","status":"publish","type":"post","link":"https:\/\/security.klbproductions.org\/?p=118","title":{"rendered":"Firewalls Explained"},"content":{"rendered":"\n

Thanks for watching another episode of Infosec Hub, today we will explain the concept of a firewall. I know most of the viewers and subscribers to my channel are more into the technical measures you can take to keep you computers and network safe, so this one is for all of you. To secure your computers and applications on a network level, the firewall is a good place to start.<\/p>\n\n\n\n

So what is a firewall ? <\/p>\n\n\n\n

A firewall is a system designed to prevent unauthorised access to a private network, the private network being your home network or a company network for instance. The attempt to access that network comes from the internet. In IT terms, the WAN, wide area network is the internet, the LAN, local area network is your own network. All computers on your private network have internet access but the firewall is placed at a central place in your network, all requests will go trough the firewall. So what do the professionals at CISCO say that a firewall is ?<\/p>\n\n\n\n

According to CISCO a provider from network devices such as switches, routers, VoIP phones a firewall is as follows;<\/p>\n\n\n\n

A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n

There are several implementations of firewalls, I will go over the most common implementations;<\/p>\n\n\n\n

Stateful inspection firewall<\/strong><\/p>\n\n\n\n

Now thought of as a \u201ctraditional\u201d firewall, a stateful inspection firewall allows or blocks traffic based on state, port, and protocol. It monitors all activity from the opening of a connection until it is closed. Filtering decisions are made based on both administrator-defined rules as well as context, which refers to using information from previous connections and packets belonging to the same connection.<\/p>\n\n\n\n

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Next generation firewall<\/strong><\/p>\n\n\n\n

Firewalls have evolved beyond simple packet filtering and stateful inspection. Most companies are deploying next-generation firewalls<\/a> to block modern threats such as advanced malware and application-layer attacks.<\/p>\n\n\n\n

According to Gartner, Inc.\u2019s definition, a next-generation firewall must include:<\/p>\n\n\n\n