DomainNameService
Domain Name Service (DNS)
mapping between IP-Adressen and names that can be remembered!
- b.
iem.at<->193.170.191.181
- 1 addresse <-> 1 name
- 1 addresse <-> many names
- virtual hosts (e.g.
193.170.191.183<->{www.iem.at, sonenvir.at})
- virtual hosts (e.g.
- many addresses <-> 1 name
- load balancing (z.b.
google.at<->{193.170.141.249, 193.170.141.212, 193.170.141.234,...})
- load balancing (z.b.
mapping of additional data:
MX record (mail exchange)
mail-server for iem.at is mail.iem.at
TXT record ("free text field")
SPF (Sender policy framework)
"who (which server) is allowed to send emails on behalf of X?"
v=spf1 +mx +a +ip4:193.170.191.182 ~all
SRV (ZeroConf service)
"is there a server available, that allows me to ... print?"
_print._tcp 3600 IN SRV 10 0 389 printer.example.com.
