Is it possible to select multiple DNS servers for a domain simultaneously in case one server is unavailable? Can primary and secondary servers be specified separately while maintaining the same settings?

When accessing DNS servers, do they initially connect to the primary or secondary server?

Lastly, can the primary and secondary servers be swapped? For example, switching from ns1.example.com and ns2.example.com to ns2.example.com and ns1.example.com.

If you don't plan to start a fully functional DNS server for secondaries and have no issues with synchronization, it's best to delegate to Google using the account that has metrics configured. Their DNS server capabilities are powerful enough.

Besides Google, another DNS server that helped me was netbreeze.net, which is from Cloudflare.

There are plenty of reasons why having your own NS servers is beneficial. To address this issue, hosts typically configure a pair of name servers in master-slave mode. With this setup, domain zones are created on both servers, but the wizard only manages the domain zone resource records.

On the other hand, the secondary (slave) name server automatically downloads changes from the master. As a result, you'll always have two active name servers with an identical set of domain zones and resource records.

Yes, it is possible to select multiple DNS servers for a domain simultaneously in case one server becomes unavailable. This can be achieved by specifying multiple DNS servers as the authoritative nameservers for the domain. You can set up primary and secondary servers separately while maintaining the same DNS settings.

When accessing DNS servers, the client usually connects to the primary server first. If the primary server is not responding or is unavailable, the client falls back to the secondary server(s) specified.

Yes, the primary and secondary servers can be swapped. For example, you can switch from using ns1.example.com as the primary server and ns2.example.com as the secondary server to using ns2.example.com as the primary server and ns1.example.com as the secondary server.

When it comes to selecting multiple DNS servers for a domain, you can specify as many servers as you want to serve as authoritative nameservers. This helps distribute the DNS load and adds redundancy in case any of the servers become unavailable.

For example, you can set up ns1.example.com, ns2.example.com, ns3.example.com, and so on as your authoritative nameservers. You would typically configure these servers with the same DNS settings and zone information to ensure consistency across all of them.

When a client wants to resolve a domain name, it first queries the primary DNS server. If the primary server is responsive and has the necessary information, it responds with the requested DNS records. However, if the primary server is unresponsive or doesn't have the information, the client will try connecting to the secondary (or backup) DNS server(s) in the list.

The primary and secondary server roles are often used to prioritize the order in which DNS servers are queried, but it's important to note that DNS servers work in a distributed manner, and any server in the list can respond if it has the required information.

As for swapping the primary and secondary servers, it is possible to switch the roles of ns1.example.com and ns2.example.com. This can be done by updating the DNS configuration at the domain registrar or the authoritative DNS server zone file. Keep in mind that after making the swap, it may take some time for the changes to propagate across the DNS network before the new configuration takes effect.