What is one potential problem that could arise when using Cloud DNS?

DNS propagation delays can be a significant issue when using Cloud DNS, as they occur when changes made to DNS records take time to be recognized by the global DNS system. When a DNS record is updated, such as when changing the IP address associated with a domain name, it may take time for this change to propagate across various DNS servers around the world. This delay can lead to inconsistencies where some users may access the old IP address while others see the new one, depending on which DNS server is queried.

This challenge is inherent in the nature of how DNS works, as it relies on a distributed system where changes must be reflected across multiple servers. While Cloud DNS generally offers high availability and resilience, the propagation delays are a well-known characteristic of DNS operations that can affect the immediacy of access to the updated resources. Understanding these delays and planning for them is crucial for network engineers when managing domain records, ensuring that users experience minimal disruption and access the correct resources in a timely manner.