1 00:00:00,480 --> 00:00:06,810 Oh, yes, I would do the same, whether it stands for open systems interconnection, whether it is 2 00:00:06,810 --> 00:00:13,860 a conceptual framework used to describe the functions of a networking system that I imagine characterizes 3 00:00:14,040 --> 00:00:21,360 computing functions into a universal set of rules and requirements in order to support interoperability 4 00:00:21,360 --> 00:00:26,760 between different products and software in the executive branch model, the communications between a 5 00:00:26,760 --> 00:00:30,060 computing system and split into seven different abstractions. 6 00:00:30,060 --> 00:00:36,760 Then the physical datalink networking, now transport last session, presentation and application. 7 00:00:37,170 --> 00:00:39,120 So let's have a look here, as you can see. 8 00:00:39,420 --> 00:00:41,430 So here are then seven layers. 9 00:00:41,430 --> 00:00:44,540 We have we have the application are the end user. 10 00:00:44,550 --> 00:00:47,630 They are actually be EFTPOS as such DNS. 11 00:00:47,820 --> 00:00:54,000 We have that presentation there, the syntax there, which is SLAC and as such a map to be. 12 00:00:54,150 --> 00:01:00,480 And you can see that the presentation, like the FTB is exists in the presentation and the application. 13 00:01:01,510 --> 00:01:07,150 We have the session left for zinc and zinc to port at the eye sockets window and so forth and so on, 14 00:01:08,050 --> 00:01:08,840 transport there. 15 00:01:09,100 --> 00:01:16,140 So he is responsible for the TCAP and UTB exists in the transport that into interconnections. 16 00:01:16,510 --> 00:01:18,730 We have the network, the Becket's. 17 00:01:18,730 --> 00:01:20,710 I'd be ICMP, I'd be sick. 18 00:01:20,710 --> 00:01:28,990 ICMP We have the datalink that frames Ethernet PBP or Triple B, we have switch and bridge. 19 00:01:29,260 --> 00:01:31,360 So you can see it is inside the datalink. 20 00:01:31,660 --> 00:01:36,530 We have the physical finally, which is the physical structure, the Cox fibres, wireless hubs, baby 21 00:01:36,530 --> 00:01:36,710 steps. 22 00:01:36,790 --> 00:01:43,840 And so OK, by the way, the doctors will be here inside this layer or categorised inside this layer. 23 00:01:44,860 --> 00:01:46,340 Now, let's start with the physical there. 24 00:01:46,840 --> 00:01:53,080 Now, this is the lowest layer of the Amazon which is concerned with electrically or optically transmitting 25 00:01:53,110 --> 00:01:58,360 raw, unstructured data bits across the network from the physical layer of the sending device to the 26 00:01:58,360 --> 00:02:00,310 physical layer of the receiving device. 27 00:02:00,520 --> 00:02:07,360 OK, so from Sinding to receiving, it can include specifications such as voltage bean layout, cabling 28 00:02:07,360 --> 00:02:08,620 and radio frequencies. 29 00:02:08,830 --> 00:02:15,310 At the physical layer, one might find physical resources such as network cabling, repeaters, network 30 00:02:15,310 --> 00:02:16,480 adapters or modems. 31 00:02:17,200 --> 00:02:18,480 Now for the player. 32 00:02:19,420 --> 00:02:26,320 At the Datalink lab, directly connected nodes are used to perform not to not transfer where the heart 33 00:02:26,330 --> 00:02:35,350 is back into frames, so that can now also corrects errors that may be that may have occurred at the 34 00:02:35,350 --> 00:02:41,060 physical level and the Datalink Claire incumbencies to suppliers of its own. 35 00:02:41,080 --> 00:02:48,400 So the first media access control, which is the provides floor control and multiplexing for device 36 00:02:48,400 --> 00:02:52,090 transmission over into the second, which is the L.L.C.. 37 00:02:52,090 --> 00:02:58,990 The logical control provides flow and it'll control over the physical medium as well as identifies the 38 00:02:59,050 --> 00:03:02,040 line protocols for the network man. 39 00:03:02,680 --> 00:03:10,000 Then it is responsible for receiving Prem's from the datalink layer and delivering them to their intended 40 00:03:10,210 --> 00:03:10,780 destinations. 41 00:03:10,780 --> 00:03:16,930 AMOC based on the addresses contained inside the Pentagon and finds the destination by using logic and 42 00:03:16,930 --> 00:03:20,000 addresses such as I.B. the Internet protocol best. 43 00:03:20,020 --> 00:03:26,920 Their doctors are crucial component used to quite literally around information where it needs to go 44 00:03:26,920 --> 00:03:27,780 between Mitra's. 45 00:03:28,960 --> 00:03:37,540 And by the way, the doctor categorized in this plan or in the cell that transported it makes the delivery 46 00:03:37,540 --> 00:03:39,300 and error checking of data packets. 47 00:03:39,460 --> 00:03:45,490 It regulates their size sequencing and ultimately the transfer of data between systems and hosts. 48 00:03:46,000 --> 00:03:54,100 One of the most common examples of the transport layer is the TCB or the transmit control, the transmission 49 00:03:54,100 --> 00:03:57,550 control protocol, or they would be so TCAP and you'd be out here. 50 00:03:58,740 --> 00:04:04,740 The session left such a large contrast, the conversations between different computers obsession, such 51 00:04:04,740 --> 00:04:11,400 an connection between machine is set up, managed and terminated, terminated at five, which is a decision 52 00:04:11,400 --> 00:04:18,180 that so essential services also include authentication and reconnections for the presentation layer. 53 00:04:19,180 --> 00:04:26,110 The layout, the presentation that formats or translated that for a beginning layer based on the syntax 54 00:04:26,110 --> 00:04:28,710 or semantics that the application exits. 55 00:04:29,020 --> 00:04:33,430 So because of this, I don't want to call the syntax down. 56 00:04:33,730 --> 00:04:37,990 This NURCAN also handed the encryption and decryption required by the application. 57 00:04:39,860 --> 00:04:45,400 And finally, we have the application now, which is at this, they are both the end user and the application 58 00:04:45,400 --> 00:04:48,670 now interact directly with the software application. 59 00:04:48,950 --> 00:04:59,660 This lab sees network services provided to end user applications such as Web browser or Office 365 365 60 00:04:59,990 --> 00:05:00,490 application. 61 00:05:00,500 --> 00:05:06,710 They are identified as communication partners, resource availability and synchronises communication.