1 00:00:00,300 --> 00:00:02,430 Let's talk about PXP relationship. 2 00:00:02,850 --> 00:00:11,340 This is the collection establishment of D.C. protocol and Pakistan transmission control protocol. 3 00:00:11,940 --> 00:00:14,610 We have some control the transmitting the data. 4 00:00:17,910 --> 00:00:24,770 And we need to establish the connection from the source to this nation before sending any package. 5 00:00:25,560 --> 00:00:31,560 So this is done in a previous event, one communication in a three way handshake. 6 00:00:32,010 --> 00:00:37,200 So first, the source wants to communicate with the nation quietly, simple protocol. 7 00:00:37,890 --> 00:00:41,330 It sends that network packet with the seal flagging it. 8 00:00:41,640 --> 00:00:50,010 So the transport these are generally data being sent is called packets are from network layer and up 9 00:00:50,010 --> 00:00:51,030 to application. 10 00:00:51,420 --> 00:00:53,010 These are generally called packets. 11 00:00:53,250 --> 00:00:55,800 And in the gathering they're called frames. 12 00:00:56,130 --> 00:00:56,960 And it's physical. 13 00:00:56,960 --> 00:01:04,710 It is with but in general, we call it as a package too, because we just deal with the other applications. 14 00:01:05,820 --> 00:01:13,680 So a source will send the packet with synchronize flag on one of these Frex containing some special 15 00:01:13,680 --> 00:01:18,710 purposes and in which one of it is synchronized if this is on. 16 00:01:18,720 --> 00:01:23,430 So we are sending that connection initiation with a packet. 17 00:01:24,260 --> 00:01:30,450 Packaged with the flag, one simple, like you said, so often unseen this package. 18 00:01:30,480 --> 00:01:37,340 This nation understands that someone is going to are wanting to connect to me. 19 00:01:37,610 --> 00:01:47,150 So if the nation wants to accept this connection, it will send simplistic, packaged simplicity. 20 00:01:47,900 --> 00:01:50,990 So interesting, Grace and I for technology. 21 00:01:51,170 --> 00:02:02,500 So this packet number will be the sum total and that synchronise is said to someone and then a card 22 00:02:02,540 --> 00:02:03,950 along with synchronises. 23 00:02:04,730 --> 00:02:09,860 The acknowledgement is also said one, and that packet is sent from this nation to source. 24 00:02:10,250 --> 00:02:16,960 So the source on the simplicity of the destination also wants to connect to me. 25 00:02:17,120 --> 00:02:22,400 So my connection is successful and it was an acknowledgement package. 26 00:02:23,240 --> 00:02:32,380 So this is an acknowledgement and the destination on seeing this acknowledgement packet, understanding 27 00:02:32,380 --> 00:02:38,900 itself that my simplistic package has been reached to the source and it has been seen by the source. 28 00:02:39,180 --> 00:02:47,330 And from then on, what I got that acknowledgement from the source, that means from this part, I can 29 00:02:47,330 --> 00:02:52,420 just send the data to and for to input from the source. 30 00:02:53,900 --> 00:02:56,660 So, OK, this is not trivial. 31 00:02:57,080 --> 00:02:57,920 Let me explain again. 32 00:02:57,950 --> 00:03:00,810 First source wants to connect to the destination. 33 00:03:00,830 --> 00:03:07,760 That's why it sends a packet with Syrian flag one single flag one and then destination on seeing this 34 00:03:07,940 --> 00:03:08,330 flag. 35 00:03:08,630 --> 00:03:16,310 If it wants to connect to the source, then it was in the same place at Flag Zone. 36 00:03:17,300 --> 00:03:24,800 And the source on seeing this implicit acknowledgement, it will understand that this station is also 37 00:03:24,800 --> 00:03:26,850 ready to accept the connection. 38 00:03:26,900 --> 00:03:29,510 That's why it was an acknowledgement packet. 39 00:03:30,230 --> 00:03:36,450 And on seeing the nation, OK, so it's got my signature, an acknowledgement packet. 40 00:03:36,740 --> 00:03:39,570 From here onwards, we can transfer the data. 41 00:03:39,590 --> 00:03:42,470 So this is a three way handshake. 42 00:03:42,860 --> 00:03:45,640 And if you use it for communication establishment. 43 00:03:46,160 --> 00:03:48,770 No, let's talk about the connection termination. 44 00:03:49,970 --> 00:03:55,850 So up to now, Suzanne, this nation has transferred the data and its source want to disconnect from 45 00:03:55,880 --> 00:03:56,720 the destination. 46 00:03:57,020 --> 00:04:02,570 So since the packet with the flag are finished and sort of finished. 47 00:04:02,750 --> 00:04:04,700 So I want to finish the connection. 48 00:04:04,700 --> 00:04:10,810 And on seeing this destination, OK, it understands that source want to disconnect from me. 49 00:04:10,820 --> 00:04:12,720 So to send the acknowledgement packet. 50 00:04:12,980 --> 00:04:19,370 So on seeing this acknowledgement packet source, wait for another packet with a Finnish flag. 51 00:04:19,670 --> 00:04:24,370 So this notion also sends the Finnish flag to the source. 52 00:04:24,620 --> 00:04:28,070 So on seeing these two packets with acknowledgement and finish. 53 00:04:28,230 --> 00:04:32,360 OK, I also got your finished packet. 54 00:04:32,690 --> 00:04:39,410 Now let me send the acknowledgement packet so that from here on what we will, we are no longer friends 55 00:04:39,410 --> 00:04:43,250 and we long we no longer communicate each other. 56 00:04:44,900 --> 00:04:50,840 So this is the TV connection television source will send the footage back to the destination. 57 00:04:52,230 --> 00:04:58,260 Because source wants to disconnect with the National Trust, the initial computer, and then answer 58 00:04:58,260 --> 00:05:05,960 in this packet, the acknowledgement faggoty and also nothing packetized, because this acknowledgement 59 00:05:05,970 --> 00:05:08,450 is to reply to this finished packet. 60 00:05:08,610 --> 00:05:13,220 And this nation also wants to disconnect with the source. 61 00:05:13,230 --> 00:05:20,670 That's why it also sends the Finnish packet and this nation gets refused to back it from the source 62 00:05:20,820 --> 00:05:23,360 saying that I got the finished product from you. 63 00:05:23,380 --> 00:05:26,290 OK, we no longer have the connection. 64 00:05:27,000 --> 00:05:28,860 So this is our DCP connection. 65 00:05:28,860 --> 00:05:29,470 Termination. 66 00:05:29,490 --> 00:05:30,660 I hope you have understood.