I wish all online nursery baby shops were as straight forward and easy to use at the 4little1s.com website. Some online nursery shops make you feel like you are studying for a MCITP exam, so for those of you who would prefer to make life complicated for themselves……
Domain Controllers and their locations.
So how does a windows client connect to its local Domain controller ? When a client connects to the network and starts, it receives an IP address (either via DHCP or static) and is ready to authenticate. First of all it needs to find a domain controller to authenticate to. Basically the client queries the domain for the location of the nearest domain controller and it does this by a query to the _tcp folder which contains the SRV record for all DC’s in the domain. DNS returns a list of the DC’s that match its criteria. If this is the first time a client has booted, it tries to contact all of them ! The first DC that replies advises the client of which SITE it belongs to and then this info is updated into the client’s registry. The client then queries the _tcp folder in the site specific folder of which DNS then provide a list of all the DC’s in the site. The client attempts to bind with all of them, but the first DC that responds first authenticates the client and forms an affinity. If DC that client has an Affinity for is down, the _tcp folder is queried again to find a new one to authenticate to.
- Step 1 – Client query to _tcp to locate SRV record
- Step 2 – DNS provides info
- Step 3 – If first boot try’s all of them !
- Step 4 – DC advises client which SITE it is supposed to be logging into
- Step 5 – Clients registry updated with info
- Step 6 – Client then queries site specific _tcp folder
- Step 7 – DC that responds, authenticates it
- Step 8 – The client is said to form an ‘affinity’ to this DC and uses it for the future
By the way, Kerberos protocol is a subject for another day, but is very interesting indeed !!
Now you may say what on earth has the above have anything to do with nursery furniture, nursery bedding, baby hampers and other baby related items….well, nothing, but it is Friday afternoon and the sun it out !!!! Roll on the weekend.......www.4little1s.com
