Naming, Trading, Directory and Discovery Services (CDK – chap.9)

Types of DNS RecordsRecord type Meaning Main contentsA A computer address IP numberNAn authoritative name server Domain name for serverS CNAME The canonical name for an alias Domain name for aliasSO Marks the start of data for a zone Parameters governing the zoneA WKS A well-known service description List of service names and protocolsPTR Domain name pointer (reverse Domain namelookups)HINFO Host information Machine architecture and operatingsystemMX Mail exchange List of < preference, host > pairsTXT Text string Arbitrary textDNS APIThere exist a number of routines which will allow DNS searching andmapping of:• network names to network address numbersgethostname( ), gethostbyname( ), gethostbyaddress( )• protocol names to protocol numbersgetprotobyname( ), getprotobynumber( ),• service names to port numbersgetservbyname( ), getservbyport( ),Ian Johnson 64 Distributed Systems