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firewall is a network security device that monitors incoming and outgoing network traffic and decides to allow or block specific traffic according to a defined set of security rules.
Firewalls have been the frontline of defense in network security for more than 25 years. They put a barrier between protected and controlled internal networks that can be classified or unclassified external networks, such as the Internet.
A firewall can be hardware, software, or both.
Firewall types
Proxy:
A proxy firewall is one of the first types of firewall and works as a transition from one network to another for a specific application. Proxy servers can offer additional features such as caching and content security by preventing direct connections from outside the network. However, this can also affect the throughput capacity and the applications that they can support.
Stateful:
Currently known as the traditional firewall, a stateful firewall allows or blocks traffic according to the state, port and protocol. It monitors all activity from the moment a connection is opened until it is closed. The filtering decisions are made according to the rules defined by the administrator and the context, which means the use of information from previous connections and packets that belong to the same connection.
Unified Threat Management (UTM):
Typically, a UTM device flexibly combines the functions of a firewall with state inspection and intrusion prevention and antivirus. It can also include additional services and, sometimes, cloud management. The UTM focuses on simplicity and ease of use.
Next Generation Firewall (NGFW):
Firewalls have evolved beyond simple packet filtering and stateful inspection. Most companies are deploying next-generation firewalls to block modern threats, such as advanced malware and attacks at the application layer.
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firewall is a network security device that monitors incoming and outgoing network traffic and decides to allow or block specific traffic according to a defined set of security rules.
Firewalls have been the frontline of defense in network security for more than 25 years. They put a barrier between protected and controlled internal networks that can be classified or unclassified external networks, such as the Internet.
A firewall can be hardware, software, or both.
Firewall types
Proxy:
A proxy firewall is one of the first types of firewall and works as a transition from one network to another for a specific application. Proxy servers can offer additional features such as caching and content security by preventing direct connections from outside the network. However, this can also affect the throughput capacity and the applications that they can support.
Stateful:
Currently known as the traditional firewall, a stateful firewall allows or blocks traffic according to the state, port and protocol. It monitors all activity from the moment a connection is opened until it is closed. The filtering decisions are made according to the rules defined by the administrator and the context, which means the use of information from previous connections and packets that belong to the same connection.
Unified Threat Management (UTM):
Typically, a UTM device flexibly combines the functions of a firewall with state inspection and intrusion prevention and antivirus. It can also include additional services and, sometimes, cloud management. The UTM focuses on simplicity and ease of use.
Next Generation Firewall (NGFW):
Firewalls have evolved beyond simple packet filtering and stateful inspection. Most companies are deploying next-generation firewalls to block modern threats, such as advanced malware and attacks at the application layer.