Domain records resolve to an Internet Address.
An IP address needs to resolve quickly & reliably!
Yes – start small and upgrade whenever you require more domains with no limits.
Updates happen within minutes across all global locations, when a DNS record is changes, updates are provisioned automatically shortly following saving record.
This is a type of Distributed Denial of Service attack – meant to try and disable your online services by overloading servers. Without Domain Name Server protection all your services could be interrupted during an attack attempt.