HI MY NAME IS SHE HAVE SOME teach ethics.
Welcome you all to Cisco firewalls course.
In this video we will cover the different types of firewalls and how they can be implemented within
your network by the end of this video.
You will be able to understand what types of firewalls can be used in your network and what is the purpose
of each type of firewall.
So let's start
our slide here explains that different types of firewalls.
The first type is packets filtering firewalls and this is actually the most basic and all this type
of firewall is not used anymore.
This type of firewall actually inspects information such as the destination and source IP address packet
type and port number but actually it does not open the packet to inspect the contents it just inspects
the header of the packets.
So as I said it's not used anymore.
It's the oldest type.
The second type is the state full inspection firewalls this cut kind or type of firewalls combined both
packet inspection technology which is the packet filtering firewalls The first type plus it applies
some kind of DCP handshake verification which means actually both the sender and receiver can actually
operate and send and receive packets at the same time and be able to transfer multiple streams of DCP
data simultaneously.
This type of firewalls actually create a level of protection greater than the first type OK we will
cover these states for inspection firewalls in a separate video and we will clarify actually how they
operate and what are the general characteristics of the states for inspection firewalls.
They will be covered in a separate video.
All right.
So the third type is the application firewalls which we call actually a proxy firewall.
I'm sure most of you heard about a proxy firewall or a proxy server why it's called application firewalls
because the operate at at the application layer which is Layer 7 of the O is I model the actually work
by filtering incoming traffic between your network which is your local network local land and the traffic
source which is coming from the outside the proxy or application of firewalls might also put four deep
layer inspections checking the actual contents of the information packets so the don't only check the
packet header the Check also the content the actual content of the packet which is actually the body
of the packet the last type is the next generation firewalls which also will be covered in a separate
video and this is what we used today actually next generation firewalls what they do.
They do deep packet inspection checking the actual contents of the data packets plus the integrate some
other technologies as well like intrusion prevention system IP.
So what we can see here is the next generation firewall is all in one firewall.
It's a firewall for packet inspection plus they can perform some intrusion prevention system that detects
detect intrusions and they prevent them.
So it's all in one solution.
All right.
So let's move through the next slide here.
We will talk about the application or proxy firewall as you can see here in this speaker the proxy firewall
resides between your internal network which is a home or office network or your enterprise or company
local network and the Internet which is the outside network as I said the proxy firewall or the application
firewall since it operates at the application layer which is Layer 7.
It actually works on applications like its TTP which is working on airport 80 FTB file transfer protocols
so they provide protocol our security analysis for the protocol they support example HDP FTB even DNS
and telnet.
OK all those are considered protocols or applications that work at Layer 7.
OK so let's clarify this application firewalls expand the operations by detecting and operating on Layer
7 and instead of just operating at the transport layer as the regular firewalls.
OK the main advantages of the application firewalls is that the hide internal IP addresses the IP addresses
are hidden or shielded.
So that means if an outside user tries to communicate with an internal user the IP address of the Internet
user is hidden the outside users can only communicate with the proxy firewall which will have actually
like a common IP address it will communicate with the outside users on behalf of the inside user.
So this is the main advantage that the policy of the Internet network is hidden
there is a shield between the inside and the outside network OK.
That's all for our 3G today and the next video we will cover what we call a state full and stateless
firewalls.
I hope you enjoy the video.
Thank you very much for watching.