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You can have more than two for a domain but usually three is tops unless you have multiple server farms where you would want to distribute the DNS lookup load. It's a good idea to have at least one of your DNS servers at a separate location. This can be helpful in the event one location goes down.

Can multiple DNS names be used for the same IP? Yes, one name has the A record, with the IP address, the other names have CNAME record, pointing back to the original, or "canonical" name.

When searching for example.com, our request is pointed toward the .com TLD. The resolver then makes a request to the .com TLD. The TLD server then responds with the IP address of the domain's nameserver, example.com. Lastly, the recursive resolver sends a query to the domain's nameserver.

Yes, two servers can have the same public IP address but typically cannot connect to the same network. It is often achieved through Network Address Translation (NAT), where a router or firewall assigns different port numbers to each server to distinguish between them.

To put it simply, the easy-to-remember domain name is resolved into IP. The service is completed by the DNS server, which resolves the domain name to an IP address, and then binds a subdirectory to the domain name on the host of this IP address.

Yes it can. A hostname is converted to a ip adress, there is no problem to having multiple dns names for a single address. If this is a webserver, the http request contains the hostname, and the webserver knows where to process the request.

Yes, it is possible for two different domains to have the same IP address. This is because an IP address (Internet Protocol address) is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication.