A-E

• A-E

  authoritative DNS server

  An authoritative DNS server is authorized by an upper-level DNS server. It is the authoritative information source for a particular domain name.

  Domain Name Service

  Domain Name Service (DNS) provides highly available and scalable authoritative DNS resolution services and domain name management services. It translates domain names or application resources into IP addresses required for network connection. By doing so, visitors' access requests are directed to the desired resources.

P-T

• P-T

  private zone

  A private zone records information about how you want to route traffic for a domain and its subdomains within one or more VPCs.

  PTR record

  A PTR record is used for reverse DNS lookup and resolves an IP address to a domain name.

  public zone

  A public zone records information about how you want to route traffic on the Internet for a domain, such as example.com, and its subdomains.

  record set

  A record set is a collection of resource records of the same type in a zone.

  time to live

  TTL is short for time to live, which specifies the cache period of resource records on a local DNS server. When the local DNS server receives a resolution request of a domain name, it asks the authoritative DNS server of the domain name for the required resource record, and then caches the record for a period of time. During this period, if the local DNS server receives resolution requests of this domain name again, it does not request the record from the authoritative DNS server, but directly returns a result from the record in its cache. The time period during resource records are cached on the local DNS server is specified by the TTL value.