Exam Essentials
Understand the purpose of DNS.
DNS is a standard set of protocols that defines a mechanism for querying and updating address information in the database, a mechanism for replicating the information in the database among servers, and a schema of the database.
Understand the different parts of the DNS database.
The SOA record defines the general parameters for the DNS zone, including who the authoritative server is. NS records list the name servers for a domain; they allow other name servers to look up names in your domain. A host record (also called an address record or an A record) statically associates a host’s name with its IP addresses. Pointer records (PTRs) map an IP address to a hostname, making it possible to do reverse ...
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