WEBVTT 00:00.260 --> 00:03.960 Hey everyone, and welcome to the Knowledge Portal Video series. 00:03.980 --> 00:07.520 Today we will be speaking mostly about protocols. 00:07.550 --> 00:09.650 Now protocol is quite important. 00:09.650 --> 00:14.040 Specifically when you are studying about networking as well as cryptography. 00:14.060 --> 00:18.650 So let's go ahead and understand protocols with some kind of a simple use cases. 00:20.090 --> 00:27.890 Now, in order for a communication to happen between two entities, a common language is very important. 00:27.890 --> 00:33.440 And this is the reason why humans have languages which are used to communicate. 00:33.500 --> 00:40.310 Now, the reason why we are able to communicate is because we speak a common language. 00:40.310 --> 00:44.180 So I speak English and you must be understanding English. 00:44.180 --> 00:47.690 And this is the reason why the communication happens. 00:47.840 --> 00:55.490 Now, if two people do not speak the same language, then ideally the communication of verbal communication 00:55.490 --> 00:58.550 is very difficult and it cannot happen. 00:59.880 --> 01:06.750 So when we talk about today's world, there are a lot of languages like English, Chinese, Hindi, 01:06.780 --> 01:11.610 Gujarati, Sanskrit, and there are a lot of languages which are available. 01:11.610 --> 01:18.030 And the people who wants to communicate verbally have to speak a common language. 01:18.030 --> 01:21.930 And this is same for computers as well. 01:22.260 --> 01:23.460 Similarly. 01:23.460 --> 01:28.980 So if you have two computers who want to talk with each other, so this is computer one and computer 01:28.980 --> 01:36.900 two, then they need to speak a common language because if computer one speaks entirely different language 01:36.900 --> 01:41.940 and computer two speaks entirely different, then the communication would not happen. 01:41.940 --> 01:49.410 And this is the reason why we have a set of standard protocols. 01:49.410 --> 01:52.110 So consider protocol as languages. 01:52.110 --> 01:59.970 So we have set of languages which are used in inter communication and all of the computers which want 01:59.970 --> 02:05.490 to communicate with each other has to follow a certain language or I would say had to follow a certain 02:05.490 --> 02:06.390 protocols. 02:06.930 --> 02:11.490 So you might have already done this. 02:11.490 --> 02:14.900 Let's assume there is a computer one and there is a computer two. 02:14.910 --> 02:18.540 Now you want both of them to communicate with each other. 02:18.540 --> 02:19.560 So what do you do? 02:19.590 --> 02:26.160 You have something called as a LAN cable and you attach the LAN cable from a computer one to computer 02:26.160 --> 02:26.730 two. 02:26.940 --> 02:35.550 And once the LAN cable is attached, there is a specific language or a specific protocol which is used 02:35.550 --> 02:38.520 in the local and local area environment. 02:38.550 --> 02:43.800 And through that common protocol, the communication will happen. 02:44.520 --> 02:51.000 So there are various kind of protocols which are used for a specific use cases. 02:51.000 --> 02:58.620 So for file transfer, you have a very famous file transfer protocol for DNS, you have domain name 02:58.620 --> 02:59.550 system protocol. 02:59.550 --> 03:07.890 Similarly, TCP IP that you might have heard transmission control protocol, Internet protocol for secure 03:07.890 --> 03:12.510 file transfer, Sftp and Http, something that you might have heard. 03:12.660 --> 03:22.050 So each of these protocol has a certain use cases, and for that use cases, each of these protocols 03:22.050 --> 03:22.560 are used. 03:22.560 --> 03:31.320 So in combine, all of these protocols are combined together and it gives us a great Internet experience. 03:32.040 --> 03:39.030 So when we talk about TCP protocol, which is transmission control protocol, it has its own language 03:39.030 --> 03:41.250 and a own way of communicating. 03:41.250 --> 03:48.270 So you might have heard about TCP three way handshake like before a communication takes place, there 03:48.270 --> 03:51.180 is a three way handshake like Cincinnati and act. 03:51.300 --> 03:57.270 So this three way handshake occurs before any communication takes place as far as transmission control 03:57.270 --> 04:00.270 protocol is taken care of. 04:00.300 --> 04:07.080 So we, if we want to understand how the protocol works, we have to understand the language which they 04:07.080 --> 04:08.700 use to communicate with. 04:09.000 --> 04:13.890 So this is the basic about the protocols. 04:13.890 --> 04:21.570 Definitely we can spend an entire course understanding each of these protocols, but in today's lecture 04:21.570 --> 04:28.500 we just went ahead and understand a high level overview on what the protocol means and in the subsequent 04:28.500 --> 04:34.680 lectures, whenever it is necessary, we will take one of the protocols and we'll dig deep down and 04:34.680 --> 04:38.130 understand on how the individual protocol works. 04:39.180 --> 04:40.230 So this is it. 04:40.230 --> 04:41.340 About this lecture. 04:41.340 --> 04:46.170 I hope this has been informative for you and I look forward to see you in the next lecture.