1 00:00:00,420 --> 00:00:05,770 Now, let us move on to the last lecture of the DNS server in this lecture. 2 00:00:05,790 --> 00:00:08,610 We are going to see the different types of the DNS. 3 00:00:09,180 --> 00:00:11,520 Not the first type is a dynamic DNS. 4 00:00:12,690 --> 00:00:20,010 At one time, all the DNS records had to be manually entered into the DNS over and then edited manually, 5 00:00:20,010 --> 00:00:20,610 then changes. 6 00:00:21,420 --> 00:00:26,520 For example, earlier, let's say there were 10 websites and there were 10 domain names and there were 7 00:00:26,520 --> 00:00:27,480 10 IP addresses. 8 00:00:27,630 --> 00:00:29,040 It was simple at that time. 9 00:00:29,040 --> 00:00:29,370 Right. 10 00:00:29,640 --> 00:00:35,190 But to date, there are millions of Web site on the Internet and the DNS administrator can just add 11 00:00:35,190 --> 00:00:38,170 and remove and delete and update their DNS records manually. 12 00:00:38,550 --> 00:00:43,110 It is a lot of tedious task to do all those things manually. 13 00:00:43,950 --> 00:00:51,090 And therefore, today, domain name server is a dynamic server and works in concert with the LCP function. 14 00:00:51,840 --> 00:00:57,840 Hosts register their names with their DNS server as they receive their IP address configuration from 15 00:00:57,840 --> 00:00:59,120 the DHC server. 16 00:01:00,120 --> 00:01:06,300 Some older operating systems are not capable of self registrations, for example, Windows XP, but 17 00:01:06,300 --> 00:01:13,770 the DCP server can even be configured to perform the registration on behalf of these clients with their 18 00:01:13,770 --> 00:01:14,640 DNS server. 19 00:01:15,690 --> 00:01:19,550 This doesn't mean that manual records cannot be created if desired. 20 00:01:19,830 --> 00:01:25,110 In fact, some of the record types that we have discussed should be created manually. 21 00:01:25,360 --> 00:01:28,860 That is the IMEX record and the C name record. 22 00:01:28,890 --> 00:01:30,690 That is the canonical name record. 23 00:01:32,460 --> 00:01:40,680 The next type of the DNS is internal and external DNS DNS servers can be located in the demilitarized 24 00:01:40,680 --> 00:01:41,080 zone. 25 00:01:41,190 --> 00:01:45,840 We have seen earlier or inside the Internet, as you can see on the screen. 26 00:01:47,800 --> 00:01:54,490 When located in the demilitarized zone, the DNS servers will only contain the records of the devices 27 00:01:54,490 --> 00:02:02,740 that are placed inside the DMZ, implementing separate internal and external DNS servers might require 28 00:02:02,740 --> 00:02:05,360 you to include external resource records. 29 00:02:05,980 --> 00:02:08,080 Now, you need to know this. 30 00:02:08,080 --> 00:02:14,800 When the Active Directory for its truth uses the same DNS name as the external network, or when you 31 00:02:14,800 --> 00:02:19,670 want to reference the externally accessible resources by their true IP addresses. 32 00:02:20,050 --> 00:02:21,010 Well, don't worry. 33 00:02:21,020 --> 00:02:25,450 This is a lot of things you actually don't need to know the different types of DNS. 34 00:02:25,450 --> 00:02:31,450 I just told you because it is my duty to provide all the knowledge that is required for you to conduct 35 00:02:31,450 --> 00:02:32,140 your interviews. 36 00:02:34,070 --> 00:02:39,950 Well, that's it, folks, we have successfully completed the networking devices of DNS servers. 37 00:02:40,310 --> 00:02:41,240 Wait, wait, wait. 38 00:02:41,690 --> 00:02:46,040 There are other networking devices as well, but those are pretty simple. 39 00:02:46,040 --> 00:02:49,690 And you just need to understand the basic working behind them. 40 00:02:50,240 --> 00:02:55,700 Again, if you are really enjoying this, cause I would like to request you to please read our course, 41 00:02:55,700 --> 00:03:00,160 and I'm waiting for your rating to be appeared on the screen. 42 00:03:00,650 --> 00:03:06,980 So in the next lecture, I will tell you of one of the most interesting servers that we keep using all 43 00:03:06,980 --> 00:03:07,540 the time. 44 00:03:07,550 --> 00:03:09,380 That is the proxy server.