Firewall Security Definition

Firewall protection is the one that controls and monitors the network traffic whether it is incoming or outgoing on predetermined rules of security.

Simply saying

It is basically a barrier or a shield applied specifically to save your PC, phone or tablet from the malwares of external world that exist in abundance on the internet.

A barrier against malwares

Functioning in simple words

It is either a piece of hardware or a software program that helps to keep the hackers, viruses, and worms to stay away from your computer. Simply speaking it screens out all the malicious activities from our network.

Advantages• Packet filter is used to inspect the header of the packet to know

its destination and where it came from.

• All this info is equated to judge whether the packet should be allowed or intercepted.

• Specific ports are used by the next Generation firewalls, which designed to filter the network and traffic based on internet.

• Proxy firewall security enables protocol aware logging. This makes easy to identify any attack.

• A backup of logs is also gained by using this that exist on the servers that are protected by the proxy.

• Installed properly at a proper time saves the company or even a person a huge sum of money.

Disadvantages

• The main function of firewalls is the restriction to a network. This can also block the legitimate users.

• The blockage of legitimate employees to access the network of the company can also lead to low productivity levels.

• Usually, these blockages are applied using strict policies so the employees might use the backdoor methods for accessing the network.

• Also firewalls don’t protect against the internal wreckage and damage,

• Which allows the unethical employees to take advantage of the weak points in the network.

• Hardware firewalls are normally more expensive and need specialized staff to maintain, install and monitor the operations.

Types of attacks against which networks are protected

• IP spoofing attacks

• Denial of service attacks (DoS attacks)

• Man in the middle attack

• Firewall security is also essential in sniffer attack

Firewall based on circuit level gatewaysadvantages

• Performance of network is not affected of affected very less.

• The direct connection between the trusted client and the untrusted host is terminated

• It possess much high level of security as compared to packet filter firewalls

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