1 00:00:17,070 --> 00:00:22,150 Let us begin the application level protocols in this lecture. 2 00:00:22,290 --> 00:00:30,690 We will see the hypertext transfer protocol, that is the GDP, the hypertext transfer protocol. 3 00:00:31,110 --> 00:00:35,970 Its GDP is a protocol used mainly to access data on the World Wide Web. 4 00:00:37,020 --> 00:00:42,090 It is a protocol for transferring your webpages, which are designed using a language called Esteemable, 5 00:00:42,330 --> 00:00:45,150 which stands for hypertext markup language. 6 00:00:46,440 --> 00:00:50,330 It should be used as the services of DCB on the well-known board. 7 00:00:50,340 --> 00:01:00,600 It is GDP Burgen one point one is the most common used version to its GDP works by using a user agent 8 00:01:00,600 --> 00:01:01,650 to connect to a server. 9 00:01:02,310 --> 00:01:09,810 The user agent could be a web browser or despite the server, must be located using the are the you 10 00:01:09,810 --> 00:01:15,390 are always content its GDP colon slash slash at the start. 11 00:01:16,080 --> 00:01:22,260 Its GDP is a glance through protocol by which two machines communicate using a reliable, connection 12 00:01:22,260 --> 00:01:24,600 oriented transport service such as the TCP. 13 00:01:25,650 --> 00:01:30,290 Its GDP can be implemented on top of any other protocol on the Internet. 14 00:01:31,830 --> 00:01:37,590 The lifetime of connection corresponds to a single request response sequence to Buhr. 15 00:01:37,590 --> 00:01:43,800 Its GDP server implementation reads every request as if it was a brand new request. 16 00:01:44,910 --> 00:01:48,990 Its GDP pages are stored on your computer and Internet guesses. 17 00:01:49,950 --> 00:01:56,280 The pages load faster, but they are stored on systems that you don't have potentially control, like 18 00:01:56,280 --> 00:01:57,870 ISP caching proxies. 19 00:01:59,040 --> 00:02:09,060 Its GDP server is implemented by the HDB server Microsoft, IIS, Jigsaw, Zopp and many other HTP functions 20 00:02:09,060 --> 00:02:12,120 as a combination of FTB and S&P. 21 00:02:13,620 --> 00:02:21,780 Although its GDP uses the services of DCB, its GDP itself, the state protocol, the client. 22 00:02:21,780 --> 00:02:28,470 Initialise that lazies the transaction by sending request, the server replies back by sending a response. 23 00:02:29,610 --> 00:02:37,170 Its GDP is called a stateless protocol because each command is executed independently without any knowledge 24 00:02:37,170 --> 00:02:38,260 of other commands. 25 00:02:39,420 --> 00:02:45,420 This is the main reason that it is difficult to implement websites that react intelligently to the user 26 00:02:45,420 --> 00:02:45,900 input. 27 00:02:46,180 --> 00:02:55,590 Now we will discuss the advantages and drawbacks of HDB, starting with the advantages its GDP is bad 28 00:02:55,590 --> 00:03:03,030 from independent, which allows straight prospect for importing no random support required to run properly. 29 00:03:03,480 --> 00:03:08,040 It can be used over firewalls, for example, global applications. 30 00:03:09,060 --> 00:03:10,580 It is not connection oriented. 31 00:03:10,980 --> 00:03:17,160 There is no need for network over there to create and maintain Sishen state information contending with 32 00:03:17,160 --> 00:03:17,940 the drawbacks. 33 00:03:18,840 --> 00:03:23,310 Integrity is not there so someone can easily alter with the content. 34 00:03:24,390 --> 00:03:28,470 HDB is insecure as there is no encryption methods for it. 35 00:03:29,070 --> 00:03:34,710 Therefore, it is subjective towards the man in the middle and eavesdropping on the sensitive information. 36 00:03:35,400 --> 00:03:41,940 There is no authentication, so you will not have any clear idea with whom you are initiating a communication. 37 00:03:43,140 --> 00:03:49,800 Authentication is send in the clear anyone who intercepts the request and can know the username and 38 00:03:49,800 --> 00:03:51,240 password being used. 39 00:03:51,630 --> 00:03:55,200 Now let's have a quick recap of what we learned in this lecture. 40 00:03:55,980 --> 00:03:58,650 We started with the general definition of HTP. 41 00:03:59,280 --> 00:04:02,730 Then we saw advantages and drawbacks of its GDP. 42 00:04:03,330 --> 00:04:07,830 What we observed was its GDP has more drawbacks than advantages. 43 00:04:08,070 --> 00:04:14,820 Therefore, in the next lecture, we will see the more encrypted version of its GDP is the its GDP is.