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To a technical protocols, you need to understand the basics of network, computer and computer networking.

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The more you understand how common networks are pooled and functions, the easier it will be to apply

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that knowledge to capturing, analyzing and exploiting new protocols.

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These course I will introduce basic network concepts you will encounter every day when you, uh, you

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are analyzing it through protocols.

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I will also lay the groundwork for a way to think about or protocols make it easier to find previously

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unknown security usurious during your analysis network architecture and protocols.

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And to me, right here, something actually, this is the network.

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And we have, for example, uh, Workstation actually tells us.

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So this is the work station, for example.

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And here.

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Um, so let's at uh, one looks at well, left up again here, for example, and.

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And workstation here.

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And, for example, it's a server again.

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This is a server and it's another server.

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Here so.

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These are the networks, so we will introduce more deeply about them so that this figure shows actually

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five nodes connected with a common network, so each node might have a different operating system or

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hardware, but as long as each node follows a set of rules or network protocol.

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Surely.

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Oops!

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It's right down here.

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OK.

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Network protocol, network protocol.

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Here.

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So, um, but as long as the whole of the set of rules or an extra protocol, it can communicate with

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the other nodes on the network, communicate correctly.

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All nodes on network must understand the same network protocol.

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And it's our protocol serves many functions, including, uh, one or more, for example.

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Let's write it down here.

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Uh, text.

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So that.

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So, um, mobs.

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So.

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Network protocol functions.

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Yes.

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Network protocol.

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Functions.

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So what is what network network?

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I already told you that network critical serves many functions, including including, for example,

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maintaining mean terror and maintaining, uh, maintaining a station, states base stations state.

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So now what maintenance assurance that means these protocols typically implement mechanisms to create

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new connections and terminate existing connections.

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Um, create new connections and terminate.

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Actually, can I do like that?

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Yes, and terminate it.

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Meaning connections here.

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So these are the functions of network protocols, and this is also identifying nodes for addressing

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what's.

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I know it's.

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So what Identifying the most for addressing means.

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OK, so data must be um.

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Troy, this.

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Others think so data the main must be addressed threat and transmits it to correct not on a network.

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So saying some protocols implement and addressing mechanism to identify specific nodes or group groups,

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actually some protocols.

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Actually, not some put yes, some protocols implement, implement and addressing mechanism and the

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racing mechanism.

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Mechanism to identify to widen ify spaces.

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Specific UM, nodes or groups of nodes, lots of or nodes, nodes or.

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Rural groups of lots.

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And here it is.

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And if a political serves many function, as you know, one of them is controlling for controlling controlling

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flow.

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So the amount of data transferred across a network is limited, politicos can implement ways of managing

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data flow to increase throttled and reduced latency.

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And we have also guaranteeing the order of trance transmitted data.

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The order of transmitted data, so many networks do not guarantee that the order in which the data is

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sent will match the order in which it's received a protocol can be reorder the data to ensure is delivered

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in the correct order.

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And we also have detecting.

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And correcting or errors?

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Errors.

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So many networks are not hundred presence, reliable data can be corrupted.

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It's important to detect corruption and ideally correct it.

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And we have to have lastly formatting, formatting and encoding data.

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Data, so the data isn't always in the form of suitable for transmitting on a network.

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So a protocol to specify ways of encoding data, such as encoding English text into English text, uh,

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into my binary files.

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So, um.

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We have all seen health protocol suites here.

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Let's come here so.

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The CPI is the de facto protocol that modern networks use.

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He's simply a pea.

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So.

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These protocols, actually, I'll you you can think of this party IP as a single protocol.

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It's actually a combination of two protocols, so that's what this trip means.

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And here next.

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But here this key IP is, uh, combination is home.