Whenever you request to open a website, the request travels to the ISP who uses its DNS server to look up the correct IP address for that URL. The ISP can effectively see every activity that you do online. A DNS leak occurs when the DNS queries travel outside the encrypted VPN tunnel, allowing the ISP from noticing your web activity. It also allows malicious users on rogue networks to intercept the communication.
OysterVPN has built mitigations to prevent DNS leaks. The VPN app ensures that your DNS queries are encrypted and the device always uses our DNS server instead of the ISP's.
Root, Top Level Domain, and Authoritative are nameservers that hold part of the information about all websites on the internet. The DNS resolver first contacts the root server for information about the website's address, which then points the resolver to TLD and Authoritative servers for the remaining information, such as the extension (.com, .net, .org) of the domain.
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