Map Development Area (MDA)
Location:
_/_
internet
_/_
dns
_/_
dns-server
| dns-server |
|
|
|
-
procedure
-
when request arrives it can do one of four things: answer the request with an IP address by looking in its cache -- contact another name server (recursive) -- return IP address from another name server to client (iterative) -- return an error message because the requested domain name is invalid or does not exist
-
Comment:
-
accepts requests from programs or from other name servers to convert domain names into IP addresses, or back
-
Comment:
-
uses the world-wide largest and most active distributed databases
-
Comment:
-
each database contains records (A, MX, NS, SOA, CNAME, PTR)
-
Comment:
-
every name server has a list of all of the known root servers
|
|
|
