The Internet Protocol suite.
TCP IP is a de facto protocol that modern networks use.
Although you can think of the TCP IP as a single protocol, it's actually a combination of two protocols
the transmission control protocol, TCP and the Internet protocol IP.
And these two protocols form part of the Internet protocol suite.
IP.
So this is the Internet protocol suite.
And these diagrams and I will explain all of these diagrams right now here.
So.
Um, and this Internet protocol suite.
This is the conceptual model of how network protocols send network traffic over the Internet that breaks
down network communication into four layer as shown in here.
So application layer, transport layer, internet layer link layer and Ethernet IP is link layer IPv4.
IPv6 is Internet layer, TCP and UDP is transport layer.
Actually let me add comma here.
TCP and UDP is transport layer HTTP SMTP, DNS is and etcetera is application layer and is actually
these protocols are more but just this is just most used protocols in internet protocol suite and these
are the external connections here.
So the link layer directly connects to a physical network and also physical network connects directly
to link layer here.
So actually, let me get this here.
Here and here I will apply the same for user application.
Right?
Here, whether it is a browser or just an online game, this is what works like that.
So now I will explain Internet protocol suite.
So let's get started with the link layer, the this link layer here.
So this layer is the lowest level and describes the physical mechanisms used to transfer information
between nodes on a local network and the well known examples include the Ethernet, both wired and wireless
and the point to point protocol p, p.
P.
We also have the internet layer here.
So this layer provides the mechanisms for addressing network nodes.
And unlike in the in layer one, this the nodes doesn't have to be located on the local network.
This level contains the IP on modern networks.
The actual protocol used could be either IP version four or IP version six.
And here we also have the transport layer.
So this layer is responsible for connections between clients and servers and sometimes ensuring the
correct order of packets and providing service.
Multiplexing and service multiplexing allows a single node to support multiple different services by
assigning a different number for each service.
And this number is called the port.
So the TCP and user datagram protocol operate on this layer and we also have the application layer.
So this layer contains network protocols such as the hypertext transfer protocol HTTP, which transfers
web page contents and the simple mail transport protocol SMTP, which transfers the email and the domain
name system protocol DNS here, which converts a name to a node on the network.
Throughout this course, we will focus primarily on this layer.
Actually, in this section we will focus primarily on this layer, but in our all of our course you
will learn all of these layers and protocols.
So see you in next lecture.