WHAT IS RECURSIVE DNS SERVER?

 RECURSIVE DNS SERVER 

WHAT IS RECURSIVE DNS SERVER?

A recursive DNS server is a type of DNS server that acts as an intermediary between your device and the authoritative DNS servers that hold the actual IP addresses for domain names.

for example: 

Imagine you're trying to find a friend's house using only their street name. It's tough, right? That's where a recursive DNS server comes in. It's like a helpful guide who takes your request (a website name) and figures out the exact address (IP address) for you. 

HERE'S HOW IT WORKS:

1. YOU MAKE A REQUEST:

When you type a website address like "[invalid URL removed]" into your browser, your device sends a request to its configured DNS server. This is usually your internet service provider's (ISP) recursive DNS server.

2. THE SERVER INVESTIGATES:

The recursive server doesn't directly know the IP address. It starts by asking other DNS servers for clues, like a detective following a trail.

3. FINDING THE RIGHT ADDRESS:

 The server keeps asking questions until it finds the authoritative DNS server that holds the actual IP address for the website you're looking for.

4. ROOT SERVER LOOKUP:

 If the recursive server doesn't have the answer in its cache, it starts by querying a root DNS server. Root servers provide the addresses of top-level domain (TLD) servers (like ".com", ".org", ".net").

5. RESPONSE:

Once the recursive server obtains the IP address, it returns it to your device, allowing your browser to connect to the website.

KEY POINTS:

1. CACHING: 

To make things faster, recursive servers remember past requests. This way, if you visit the same website again, the server can quickly provide the answer.  

2. EFFICIENCY:

  They handle the complex process of finding the authoritative servers, making it easier for end-users and devices.

3. COMMON USE:

Most internet users rely on recursive DNS servers provided by their ISPs.

CONCLUSION:

There are no consequences to using a recursive DNS server. In fact, they are essential for most internet users.  Seamlessly translating website names into IP addresses, making our online experience smooth and effortless.