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A namespace server is a server that manages a namespace, which is a hierarchical system used to organize and name resources in a distributed computing environment, such as a computer network or the internet.
DNS delegation is the process of assigning authority over a subdomain to a separate DNS server, which becomes responsible for managing and resolving the records within that subdomain. This allows for greater scalability and flexibility in managing large DNS zones and can improve the performance and reliability of the DNS infrastructure.