Domain Name System

[naveenkumarbasupally]

can anyone explain this How DNS works to translate human-readable domain names into IP addresses.

[Martin L]

you can find several good vidoes on youtube

https://www.youtube.com/watch?v=mpQZVYPuDGU&pp=ygURaG93IGRvZXMgZG5zIHdvcms%3D

https://www.youtube.com/watch?v=uOfonONtIuk&pp=ygURaG93IGRvZXMgZG5zIHdvcms%3D

[M02@rt37]

Hello @naveenkumarbasupally,

Please find summarized explanation:

-Device checks its local DNS cache for the corresponding IP address.

-If not in cache, device sends a request to a DNS resolver.

-Resolver contacts root DNS servers to find domain's TLD (e.g., .com).

-Resolver queries TLD DNS servers to find authoritative DNS server for the domain.

-Resolver queries authoritative DNS server for the domain's IP address.

-Authoritative DNS server responds with the IP address.

-Resolver caches the IP address for future use.

-IP address is sent back to the application or browser.

-Application connects to the web server using the IP address.

-Application retrieves content (web page, service, etc.) from the web server.

 

[DuoKristina]

Hi @naveenkumarbasupally !

This community forum is for questions about protecting applications with Duo multifactor authentication and zero-trust access.

Questions about basic networking concepts may be better suited for the Networking community: https://community.cisco.com/t5/networking/ct-p/4461-network-infrastructure.