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.
Packet Filtering
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.
Stateful Inspection
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.
Application Filtering
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.
Proxy Service
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.
Contact us on (216) 503-5150 ext 206 or write to us at http://www.netactivity.us/contact.html.
To know more about network security services refer to: http://www.netactivity.us/security-services.html
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