As you know, DNS is the technology behind surfing the internet. Domain Name System, DNS, turns domains into IPs. There are several DNS servers, each with a specific role in this process. Let’s explore these DNS server types in detail.
DNS Server Types
DNS Resolver
The DNS resolver is the first server you interact with when you try to visit a website. It is responsible for starting the IP-finding process. When you enter a website address into your browser, your device queries the DNS resolver. The resolver then begins the task of finding the correct IP address. If it already has the answer cached from previous requests, it sends it back instantly. If not, it starts querying other DNS servers to get the information.
Root Name Server
This server is sitting at the top of the DNS hierarchy. It's the starting point for any DNS query. A few dozen root name servers worldwide don’t know the specific IP addresses for domains; however, they do know where to find the servers responsible for the top-level domains (TLDs) like .com or .org. When the DNS resolver queries a root name server, it directs the resolver to the TLD server that handles the domain of interest. This step is crucial as it narrows the search to a more manageable level.
TLD Name Server
TLD name servers manage the last part of a domain name, such as .com, .org, or .net. Each TLD has its own set of name servers that handle the domains within that TLD. For instance, if you are looking for example.com - the TLD name server for .com knows where to find the authoritative name servers for example.com. When the DNS resolver queries the TLD name server, it gets the address of the authoritative name server for the specific domain. This step directs the resolver to the next server with the final answer.
Authoritative Name Server
The authoritative name server holds the actual DNS records for domain names. This server has the final say in translating a domain name into an IP address. When the DNS resolver contacts the authoritative name server, it gets the precise IP address for the domain you are interested in.
There are two types of authoritative name servers: primary & secondary. The primary authoritative server has the original DNS records. The secondary server is a backup that gets updated with the same information to ensure reliability.
Forwarding DNS Server
A forwarding DNS server is a specialized DNS server that only forwards queries to other DNS servers. It doesn’t hold any DNS records itself. This server is often used in larger networks to manage DNS requests more efficiently. When a forwarding DNS server receives a query, it sends the request to another DNS server, usually an external one - and then passes the response back to the original requester. This setup can help reduce the load on the internal DNS infrastructure and streamline DNS resolution processes.
Caching DNS Server
A caching DNS server stores DNS query results temporarily to speed up subsequent requests. When a caching DNS server receives a query, it first checks its cache to see if it already has the IP address for that domain. If it does, it quickly provides the answer without needing to query other DNS servers. Caching reduces the time and resources required for DNS lookups and improves overall network performance. However, the information stored in the cache can become outdated - which is why cached data has a Time-to-Live (TTL) value that determines how long it can be stored before it needs to be refreshed.
Conclusion
The DNS server and its types have their roles. From the initial query to the final response - each type of DNS server plays a vital part. They work together to keep the internet running smoothly.
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