What is Firewall ?

Firewall

A firewall is a network security system designed to prevent an unauthorized access to or form a private network. It acts as a barrier between a trusted network and be implemented in both hardware and software or a combination of both.

In a easy way, You can say, In a computer, a firewall is a network security that monitors and controls incoming and outgoing network traffic.

Firewall (like moat) must be installed in the server or workstations. It protects the system from unauthorized access and ensures that requests for transaction can be made to a system from an authorized workstation only.

What Firewalls Do ?

 Basically, firewalls need to be able to perform the following tasks:

• Act as an intermediary 
• Defend resources
• Record and report on events
• Validate access
• Manage and control network traffic

Types of Firewalls

Proxies firewalls/Server

A proxies server may acts as a firewall by responding to input packets in the manner of an application, while blocking other packets. Proxy servers can provide additional functionality direct connections from outside the network. However, this also may impact throughput capabilities and the applications they can support.

Next-generation firewalls (NGFW)

Firewall 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 application-layer attracts. It is combine traditional firewall technology with additional functionality.

Unified threat management (UTM) firewalls

A UTM device typically combines, in a loosely coupled way, the functions of a stateful inspection firewall with intrusion prevention and antivirus.

Stateful multilayer inspection (SMLI)

Like NGFW firewalls SMLI also examine the entire packet and only allow them to pass if they pass each other layer individually. It monitors all activity from the opening of connection untill it is closed. These firewalls examine packets to determine  the state of communication to ensure all initiated communication is only place with trusted sources.

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