Network PC World

DNS (Domain Name System) plays a critical role in how users and systems find resources on the internet or within internal networks. Whether it's managing an internal domain in an enterprise or delegating parts of a domain for traffic distribution, DNS setups vary widely depending on needs. In this blog post, we’ll break down the different types of DNS setups, including authoritative DNS servers, DNS delegation, and how internal DNS functions within organizations. 1. Authoritative DNS Server An Authoritative DNS server is the final source of truth for a specific domain. When someone queries a domain (e.g., example.com ), the authoritative DNS server for that domain holds the DNS records (A records, CNAME, MX, etc.) and responds with the corresponding IP address. Key Points: Who can host it? Authoritative DNS servers are often hosted by domain registrars (e.g., GoDaddy, Namecheap) or cloud DNS providers (e.g., AWS Route 53, Cloudflare). However, organizations can also host their ...

DNS (Domain Name System) is a crucial part of how the internet works, converting domain names into IP addresses and directing traffic. Within DNS, different types of records serve specific functions. Two key types are SRV (Service Records) and NS (Name Server Records) . SRV (Service) Records SRV records are used to define the location of specific services. These records are crucial when multiple servers can provide the same service (e.g., VoIP, messaging) and a specific server needs to be selected. They contain the following components: Service & Protocol : Defines the service (e.g., _sip , _xmpp ) and protocol ( _tcp , _udp ). Priority & Weight : Direct traffic to the most preferred server. Port & Target : Specify the server's port and hostname. Example: _sip._tcp.example.com SRV 10 60 5060 sipserver.example.com NS (Name Server) Records NS records delegate the authority for a domain to specific name servers. These name servers are responsible for answering DNS queries...