Q: When troubleshooting Domain Name System (DNS) problems, which helpful feature do public servers usually support?
or
Q: Which useful feature do public servers often provide while debugging DNS (Domain Name System) issues?
- Port connectivity
- Paths between nodes
- ICMP echo requests
- Virtualization services
Explanation: Recursive DNS resolution is often supported by public DNS servers. This capability is important for debugging issues related to the Domain Name System (DNS). In recursive DNS resolution, the DNS server will contact additional DNS servers on behalf of the client to completely resolve a domain name to its matching IP address. Generally speaking, recursive DNS resolution is the preferred method. Public DNS servers, such as those offered by Google (8.8.8.8, 8.8.4.4) or OpenDNS, often provide recursive resolution. Using them may help debug DNS problems and provide dependable name resolution services.
