DNS Services in cloud

• How DNS Works
  
• DNS Record Types
  
• DNS Servers can be public or private

Public DNS

• Generally when we buy a domain we get NS Servers info
• AWS sells domains where azure doesn’t. But both AWS and Azure have name servers (Authorative Servers)
• In AWS this is managed by service called as Route 53 and Azure has Azure DNS
• They also offer private DNS servers which are connected to cloud networks.
• Domain Seller Gives a Domain with
• NS Records
• SOA Records

Usecases

1. Domains in private networks
2. Adding entries (A Records) public and private
3. DNS Routing
4. Multi-Region use cases (Active-Active)
5. Active Passive