#Domeinnamen: Wat is CNAME record, A record, AAAA record?


Een CNAME record (Canonical Name record), is een type record, dat zich binnen een domeinnaam bevindt. Met behulp van een CNAME record kan je een verwijzing gaan maken naar een A record. 

Domeinnaam en subdomein

Theoretisch kan men zeggen dat domeinnamen een intuïtieve manier zijn om een website te benoemen en te vinden. Elke domeinnaam vervangt een rij nummers (een IP-adres) door één of meerdere woorden. Doordat die rij nummers vervangen wordt, wordt het voor bezoekers gemakkelijker om je website te onthouden en terug te vinden. Een subdomein is het gedeelte voor de domeinnaam en extensie en is in de DNS aan te maken. Het subdomein wordt ook wel First Level Domain genoemd.

DNS

Domain Name System (DNS) zet domeinnamen om naar IP adressen. Hier kan je je voorkeuren kenbaar maken en instellen waar het domein, subdomeinen en mailrecords naar toe mogen verwijzen. 

A record

Met een A Record kan je subdomeinen en domeinen apart naar ip-adressen laten verwijzen. Wanneer alle records en subdomeinen naar hetzelfde IP adres verwijzen, kan je het hoofddomein met een A record naar het IP adres laten verwijzen en de overige records en subdomeinen via een CNAME naar dit A record laten verwijzen. Wanneer je te maken krijgt met een wijziging, hoeft er maar eentje aangepast te worden. 

AAAA record

Met een AAAA record kan je (sub)domeinen laten verwijzen naar een IPv6 adres. Dat is de opvolger van IPv4 adressen, die zo goed als uitgeput zijn. Het verschil tussen deze twee is dat IPv4 adressen bestaan uit 32 bits en hun opvolgers, IPv6, uit 128 bits. IPv6 heeft ook genoeg ter beschikking dus hoeft men zich daar zeker nog geen zorgen over te maken. Bovendien heeft IPv6 ook een betere routing en netwerk configuratie, wat ervoor zorgt dat NAT overbodig is. Ook qua beveiliging zitten ze op IP niveau, wat zeker goed is en er wordt voldoende mobiele ondersteuning verzorgd.

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