DNS in Depth | Domain name system |

• DNS is essential for the functioning of the internet as it maps domain names to IP addresses.
• DNS follows a process involving recursive resolvers, root name servers, top-level domain servers, and authoritative name servers.
• Recursive resolvers receive DNS queries from clients and forward them to other servers until the IP address is resolved.
• Authoritative name servers hold the final DNS records and provide the IP address for a specific host name.
• The authoritative server can have a subdomain that can be contacted to fetch the IP for a particular hostname.
• DNS lookup information is often cached locally or remotely, which speeds up the process.
• There are eight steps in a DNS lookup process, and when information is cached, some steps are skipped.
• Recursive queries require a DNS server to respond with the requested resource record or an error message.
Chapters :
• 00:00:00 Understanding the Domain Name System
• 00:03:14 Understanding DNS Resolution
• 00:06:17 The DNS Resolution Process
• 00:10:53 Understanding Name Servers
• 00:17:29 DNS Lookup Process
• 00:23:02 DNS Resolution Process
• 00:26:43 DNS Queries and Caching