2018-12-19

Active Directory Site Topology 에 따른 Client affinity



Client affinity

Domain controllers use site information to inform Active Directory clients about domain controllers present within the closest site as the client. For example, consider a client in the Seattle site that does not know its site affiliation and contacts a domain controller from the Atlanta site. Based on the IP address of the client, the domain controller in Atlanta determines which site the client is actually from and sends the site information back to the client. The domain controller also informs the client whether the chosen domain controller is the closest one to it. The client caches the site information provided by the domain controller in Atlanta, queries for the site-specific service (SRV) resource record (a Domain Name System (DNS) resource record used to locate domain controllers for AD DS) and thereby finds a domain controller within the same site.

By finding a domain controller in the same site, the client avoids communications over WAN links. If no domain controllers are located at the client site, a domain controller that has the lowest cost connections relative to other connected sites advertises itself (registers a site-specific service (SRV) resource record in DNS) in the site that does not have a domain controller. The domain controllers that are published in DNS are those from the closest site as defined by the site topology. This process ensures that every site has a preferred domain controller for authentication.

날개죽지가 3년여 전부터 아프더니 이젠 자주 아프다. 도수치료도 잠깐이고 결국 스트레칭을 해야 하는데 쉽지 않다. 어깨까지 결리고, 점차 늙어가는 육신에 통증이 더해가며 시간은 점점 빠르게 지나간다..