what is DNS namespace

DNS namespace: a hierarchical, tree-structured list of DNS host names and domain names.

Starting at an unnamed root that is used for all DNS operations. Each domain can have additional chaild domains: a typical DNS namespace might be the google.com domain, which contains the us.google.com child domains within the same namespace, and host names also called leaf objests, representsing individual TCP/IP-enabled devices such as server1.austin.us.google.com, hplaserjet.sales.ee.google.com, or www.us.google.com

DNS namespace that you might find on the Internet.

The DNS namespace has a hierarchical structure, and each DNS domain name is unique within a namespace.

• In Diagram at that top of the Internet DNS namespace is root domain. The root domain is represented by "." ( A Period).
  

• Under the DNS root domain, the top-level domains,or first-level domain, are organizational types such as .com , .edu, .org.

• Infrastructure domain : google is the Internet's infrastructure domain name.