Final answer:
DNS is the application layer protocol that can help find the appropriate CDN server by translating domain names to IP addresses.
Step-by-step explanation:
The application layer protocol that could help finding the appropriate CDN (Content Delivery Network) server is DNS (Domain Name System).
DNS is responsible for translating domain names into IP addresses. When a client application wants to access a website, it sends a DNS query to a DNS resolver. The DNS resolver then looks up the IP address associated with the domain name, allowing the client to establish a connection to the correct server.
This process is crucial for CDNs, as they rely on DNS to direct clients to the nearest server location based on their geographical location or other factors.