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IP ADDRESSING SERVICES - Coggle Diagram
IP ADDRESSING SERVICES
DNS DOMAIN NAME SERVICE
DNS Message Format
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When a client makes a query, the server DNS process first looks at its own records to resolve the name. If it is unable to resolve the name by using its stored records, it contacts other servers to resolve the name.
After a match is found and returned to the original requesting server, the server temporarily stores the numbered address in the event that the same name is requested again.
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DNS Hierarchy
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Each DNS server maintains a specific database file and is only responsible for managing name-to-IP mappings for that small portion of the entire DNS structure.
When a DNS server receives a request for a name translation that is not within its DNS zone, the DNS server forwards the request to another DNS server within the proper zone for translation.
Examples of top-level domains:
- .com - a business or industry
- .org - a non-profit organization
- .au - Australia
The nslookup Command
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When the nslookup command is issued, it displayed the default DNS server for your host
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