Firewalls & network security services are known to all those who use the internet and stands important as a protective shield to your network. Today, internet is a basic necessity of computer (or any digital media) users. However, it also invites invader’s attack on the network security which can lead to build up a malicious traffic on your system by encouraging unauthorized access to and from a network.
How does a firewall network security plan works:
A firewall is responsible for bringing in only safe and relevant traffic to your private network or computer system. It keeps a check on any unauthorized access to your computer and automatically refuses and decrypt’s unwanted information through the network.
It uses one or a combination of the following three methods to monitor traffic flowing in and out of the network.
This is the earliest and very basic type of firewall protection that inspects packets of information and flags inappropriate content or suspicious files. It uses a pre-defined set of rules to detect the packet’s source and destination address, protocol, and destination port number.Although the transport layer is used to obtain the source and destination port numbers, the packet filter firewalls mainly work on the first three layers of the OSI reference model.
Introduced in 1994, the Stateful Packet Inspection provided additional information about the origin of a packet – whether it is a part of an existing connection or not. This eventually led to speeding up of packet processing. Stateful firewalls, without further analysis, allow packets that are part of an existing connection and evaluate others according to the rules set for new connections.
With the increasing web server attacks, application-layer firewalls emerged in 1999 to protect servers as well as the applications. This enabled the firewalls to filter packets on any OSI layer up to the application layer. The advantage of application layer filtering is that it lets you block specific content like malware or certain websites and recognize when certain protocols such as HTTP, FTP & DNS are being misused.
It acts as an intermediary between systems. The proxy firewall prevents establishing direct connections between both the sides; they are forced to conduct a session through the proxy, which can block or allow traffic according to the pre-defined set of rules.
Firewalls are an inseparable part of the packages provided by managed IT support services providers (MSSPs). Net Activity, Inc. a leading provider of internet security services, Cleveland includes firewall security as a service with management of threats from the network operational center.
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