Networking — DNS basics

DNS basics

DNS uses port 53. Normaly UDP to query, sometimes TCP for zone transfers

To find local DNS resolver , use site like https://browserleaks.com/ip

www.google.com = .com(root domain, .google.com secondary domain)

use command dig to trace different types of records

dig google.com A @8.8.8.8 +trace

DiG HOWTO

To protect DNS spoofing use DNSSec with asymmetric Algorithm