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What Is Firewall ? | Firewall Explained | Firewalls and Network Security | Simplilearn | Simplilearn | YouTubeToText
YouTube Transcript: What Is Firewall ? | Firewall Explained | Firewalls and Network Security | Simplilearn
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Video Transcript
imagine our houses without a fence or
boundary wall
this would make our properly easy
accessible to trespassers and robbers
and place our homes at great risk right
hence fencing our property helps
safeguard it and keeps trespassers at bay
bay
similarly imagine our computers and
networks without protection
this would increase the probability of
hackers infiltrating our networks
to overcome this challenge just like how
boundary walls protect our houses a
virtual wall helps safeguard and secure
our devices from intruders and such a
wall is known as a firewall
firewalls are security devices that
filter the incoming and outgoing traffic
within a private network
for example if you were to visit your
friend who lives in a gated community
you would first take permission from the
security guard the security guard would
check with your friend if you should be
allowed to entry or not if all is well
your access is granted on the other hand
the security guard would not grant
permission to a trespasser looking to
enter the same premises
here the entry access depends solely on
your friend the resident's discretion
the role of the security guard in this
case is similar to that of a firewall
the firewall works like a gatekeeper at
your computer's entry point which only
welcomes incoming traffic that it has
been configured to accept firewalls
filter the network traffic within your
network and analyzes which traffic
should be allowed or restricted based on
a set of rules in order to spot and
prevent cyber attacks
your computer communicates with the
internet in the form of network packets
that hold details like the source
address destination address and information
information
these network packets enter your
computer through ports the firewall
works on a set of rules based on the
details of these network packets like
their source address a destination
address content and port numbers
only trusted traffic sources or ip
addresses are allowed to enter your network
network
when you connect your computer to the
internet there is a high chance of
hackers infiltrating your network
this is when a firewall comes to your
rescue by acting as a barrier between
your computer and the internet the
firewall rejects the malicious data
packet and thus protects your network
from hackers on the other hand traffic
from trusted websites is allowed access
to your network
this way the firewall carries out quick
assessments to detect malware and other
suspicious activities
thereby protecting your network from
being susceptible to a cyber attack
firewalls can either be hardware or software
software
software firewalls are programs
installed on each computer this is also
called a host firewall
meanwhile hardware firewalls are
equipments that are established between
the gateway and your network linksys
routers are a good example of a hardware firewall
firewall
besides this there are other types of
firewalls designed based on their
traffic filtering methods structure and functionality
functionality
the firewall that compares each outgoing
and incoming network packet to a set of
established rules such as the allowed ip
addresses ip protocols port number and
other aspects of the packet is known as
a packet filtering firewall
if the incoming network traffic is not
per the predefined rules that traffic is blocked
blocked
a variant of the packet filtering
firewall is the stateful inspection firewall
firewall
these types of firewalls not only
examine each network packet but also
checks whether or not that network
packet is part of an established network connection
connection
such firewalls are also referred to as
dynamic packet filtering firewalls
our next type of firewall is called a
proxy firewall
this draws close comparison to how you
give proxy attendance for a friend like
how you take the authority to represent
your friend the proxy firewall pretends
to be you and interacts with the internet
internet
they come between you and the internet
and thereby prevents direct connections
this protects your device's identity and
keeps the network safe from potential attacks
attacks
only if the incoming data packet
contents are protected the proxy
firewall transfers it to you they are
also known as application level gateway
the firewall can spot malicious actions
and block your computer from receiving
data packets from harmful sources in
addition to preventing cyber attacks
firewalls are also used in educational
institutions and offices to restrict
users access to certain websites or
applications it is used to avoid access
to unauthorized content
so here's a question for you which
firewall is also known as application
level gateway
a proxy firewalls b stateful inspection firewalls
firewalls
c packet filtering firewalls d dynamic
packet filtering firewalls
do give it a thought and leave your
answers in the comments section below
three lucky winners will receive amazon
gift vouchers
cyber crimes are today making headlines
every day
and individuals and companies must do
everything possible to secure their information
information
hence using security devices that help
safeguard our networks from falling prey
to deadly cyber attacks is the need of
the hour
we hope you enjoyed this video if you
did a thumbs up would be really
appreciated here's your reminder to
subscribe to our channel and click on
the bell icon for more on the latest
technologies and trends thank you for
watching and stay tuned for more from
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