One Article Review
| Source |  AlienVault Blog |
|---|---|
| Identifiant | 1909203 |
| Date de publication | 2020-09-10 05:01:00 (vue: 2020-09-10 14:13:07) |
| Titre | Firewalls explained: the different firewall types and technologies |
| Texte | This blog was written by a third party author. Finding the right network security tools to secure your sensitive data can be a significant challenge for any organization. Choosing a firewall may seem like a simple task, but companies can get overwhelmed by the different firewall types and options. Making the distinction between a firewall and other security solutions can also pose challenges. Here are the answers to some of the most common firewall questions. What is a firewall? And what isn’t a firewall? A firewall is a network security perimeter device that inspects traffic entering and leaving the network. Depending on the security rules assigned specifically to it, the firewall either permits safe traffic or denies traffic it deems as dangerous. A firewall’s main objective is to establish a barrier (or “wall”) that separates an internal network from incoming external traffic (such as the internet) for the purpose of blocking malicious network packets like malware and hacking. When discussing firewalls, it is critical to clear up any confusion regarding what constitutes a firewall and what does not. For instance, intrusion detection systems, routers, proxy servers, VPNs and antivirus solutions are not firewalls. Many firewall architectures are built into other security solutions, and many security solutions are built into firewalls. How does firewall technology work? Firewalls carefully analyze incoming traffic arriving on a computer’s entry point, called a port, which determines how external devices communicate with each other and exchange information. Firewalls operate using specific firewall rules. A firewall rule will typically include a source address, a protocol, a port number and a destination address. Here’s an analogy to explain the components of a firewall rule. Instead of protecting a network, think of a giant castle. The source address represents a person wishing to enter the castle. The port represents a room in the castle. The protocol represents a mode of transportation, and the destination address represents the castle. Only trusted people (source addresses) may enter the castle (destination address) at all. Or perhaps only people that arrive on foot (protocol). Once inside, only people within the house are permitted to enter certain rooms (destination ports), depending on who they are. The king may be allowed in any room (any port), while guests and servants may only access a certain number of rooms (specific ports). In this analogy, the firewall would act like an elaborate alarm system. Types of firewalls and deployment options Adding to the confusion of what constitutes a firewall, there are numerous firewall types to be aware of. First, firewalls are classified by what they are and where they reside. For example, firewalls can either be hardware or software, cloud-based or on-premises. A software firewall resides on an endpoint (like a computer or mobile device) and regulates traffic directly from that device. Hardware firewalls are physical pieces of equipment that reside between your gateway and network. Cloud-based firewalls, also known as Firewall-as-a-service (FaaS), act like any other internet-based SaaS solutions, performing their work in the cloud. Next, and this is the most common distinction between types, firewalls are classified by functionality. The most common firewall types based on methods of operation are: Packet-filtering firewalls Proxy firewalls NAT firewalls Web application firewalls Next-gen firewalls (NGFW) Packet-filtering firewalls Packet-filtering firewalls, the most basic firewall type, examine packets and prevent them from moving on if the specific security rule is not met. This firewall's function is to perform a simple check of all data packets a |
| Envoyé | Oui |
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| Tags | Malware Threat |
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