1 00:00:06,990 --> 00:00:14,910 When you enter the main controller to domain their domain controller advertises its services by creating 2 00:00:15,240 --> 00:00:23,010 service resource records or SRB also known as the key to records in DNS. 3 00:00:23,010 --> 00:00:33,330 Unlike hosted resource records or a resource records which map host names to IP addresses it's our real 4 00:00:33,330 --> 00:00:34,230 records. 5 00:00:34,230 --> 00:00:43,620 Map services to host names for example to publish its ability to provide authentication and Directory 6 00:00:43,710 --> 00:00:47,550 Access at domain controller registers. 7 00:00:47,550 --> 00:00:57,250 Gerber US version 5 protocol and Lightweight Directory Access Protocol or ELL Deb as service records. 8 00:00:57,310 --> 00:01:06,120 This is a real records are ready to several folders within the forests DNS zones within that domain 9 00:01:06,120 --> 00:01:16,970 zone a folder named underscore DCP contains the SRP records for all domain controller center domain. 10 00:01:17,010 --> 00:01:26,010 Additionally within the domain zone is a folder named sites which contains sub folders for each site 11 00:01:26,100 --> 00:01:34,350 that is configured to the domain each site specific folder contains a survey records that represents 12 00:01:34,350 --> 00:01:37,560 services that are available in the site. 13 00:01:37,590 --> 00:01:46,360 For example if a domain controller is located in a site is a review record is that the pass underscore 14 00:01:46,390 --> 00:01:56,430 sides backslash site name backslash underscore to C.P. where site name is a site's name your site's 15 00:01:56,430 --> 00:01:57,180 name. 16 00:01:57,180 --> 00:02:01,020 A typical a service record contains the following information. 17 00:02:01,170 --> 00:02:07,820 The service name and port protocol and hostname service name and port. 18 00:02:07,830 --> 00:02:13,470 This portion of the service record indicates a service with a fixed port. 19 00:02:13,500 --> 00:02:22,800 It does not have to be a well-known board as the records include all DEP which is Port 389 core boroughs 20 00:02:23,010 --> 00:02:33,690 which is Port 88 Cobra's version 5 authentication protocol which is Port 464 64 and global catalog services 21 00:02:33,960 --> 00:02:37,630 which is port sorted to sixty eight. 22 00:02:37,620 --> 00:02:48,180 As for protocol the Transmission Control Protocol or DCP or use and data grim protocol or UDP is indicated 23 00:02:48,240 --> 00:02:56,460 as a transport protocol for service the same service can use both protocols in separate as there were 24 00:02:56,460 --> 00:03:06,390 records Gerber records for example are registered for both to CB and to UDP Microsoft clients use only 25 00:03:06,430 --> 00:03:15,600 DCP but Unix clients can use both UDP anticipate as for hostname information the hostname corresponds 26 00:03:15,600 --> 00:03:24,270 to the host resource record or a resource record for the server that hosts the service when a client 27 00:03:24,310 --> 00:03:33,780 queries for a service the DNS server returns the service record and associated host resource records 28 00:03:34,050 --> 00:03:42,690 so the client does not need to submit a separate where to resolve the service IP address the service 29 00:03:42,690 --> 00:03:51,060 name in a service record follows the standard DNS hierarchy with DOD separate and the components for 30 00:03:51,060 --> 00:04:00,000 example a domain controllers Gerber a service is registered as Gerber as DOD underscored to Sebi DoD 31 00:04:00,210 --> 00:04:10,440 side name DoD side DOD domain name and Cerberus is a Gerber key distribution center that uses to B as 32 00:04:10,440 --> 00:04:17,730 its transport protocol underscore disappear it is and it is the P based service on the site site name 33 00:04:17,730 --> 00:04:25,740 is a site of the domain controller that is registering the service undisclosed sites is all sites that 34 00:04:25,740 --> 00:04:33,570 are registered with DNS and domain name is a domain or zone such as com torso dot com.