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The Internet Protocol suite.

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TCP IP is a de facto protocol that modern networks use.

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Although you can think of the TCP IP as a single protocol, it's actually a combination of two protocols

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the transmission control protocol, TCP and the Internet protocol IP.

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And these two protocols form part of the Internet protocol suite.

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IP.

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So this is the Internet protocol suite.

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And these diagrams and I will explain all of these diagrams right now here.

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So.

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Um, and this Internet protocol suite.

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This is the conceptual model of how network protocols send network traffic over the Internet that breaks

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down network communication into four layer as shown in here.

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So application layer, transport layer, internet layer link layer and Ethernet IP is link layer IPv4.

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IPv6 is Internet layer, TCP and UDP is transport layer.

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Actually let me add comma here.

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TCP and UDP is transport layer HTTP SMTP, DNS is and etcetera is application layer and is actually

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these protocols are more but just this is just most used protocols in internet protocol suite and these

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are the external connections here.

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So the link layer directly connects to a physical network and also physical network connects directly

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to link layer here.

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So actually, let me get this here.

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Here and here I will apply the same for user application.

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Right?

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Here, whether it is a browser or just an online game, this is what works like that.

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So now I will explain Internet protocol suite.

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So let's get started with the link layer, the this link layer here.

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So this layer is the lowest level and describes the physical mechanisms used to transfer information

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between nodes on a local network and the well known examples include the Ethernet, both wired and wireless

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and the point to point protocol p, p.

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P.

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We also have the internet layer here.

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So this layer provides the mechanisms for addressing network nodes.

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And unlike in the in layer one, this the nodes doesn't have to be located on the local network.

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This level contains the IP on modern networks.

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The actual protocol used could be either IP version four or IP version six.

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And here we also have the transport layer.

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So this layer is responsible for connections between clients and servers and sometimes ensuring the

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correct order of packets and providing service.

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Multiplexing and service multiplexing allows a single node to support multiple different services by

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assigning a different number for each service.

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And this number is called the port.

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So the TCP and user datagram protocol operate on this layer and we also have the application layer.

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So this layer contains network protocols such as the hypertext transfer protocol HTTP, which transfers

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web page contents and the simple mail transport protocol SMTP, which transfers the email and the domain

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name system protocol DNS here, which converts a name to a node on the network.

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Throughout this course, we will focus primarily on this layer.

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Actually, in this section we will focus primarily on this layer, but in our all of our course you

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will learn all of these layers and protocols.

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So see you in next lecture.