Certified Kubernetes Application Developer (CKAD) Practice Test

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What protocol is often specified in the Volumes section of a Kubernetes Pod definition for accessing a database?

HTTP
TCP
UDP
FTP

The correct answer is: TCP

In the context of accessing a database from a Kubernetes Pod, the protocol typically specified in the Volumes section is TCP. This is because most databases communicate over the TCP protocol, which provides a reliable, ordered, and error-checked delivery of a stream of data between applications. TCP is particularly well-suited for database interactions, as it ensures that all packets are delivered without loss and in the correct order, which is critical for maintaining data integrity. When a Pod needs to connect to a database service, it often specifies the database's service address along with the port that listens for TCP connections. Using TCP allows for robust communication, as it handles flow control and retransmission of lost packets, making it the preferred choice for stateful applications like databases. Other protocols such as HTTP, UDP, and FTP have different characteristics and are used for specific use cases. For example, HTTP is typically used for web services and APIs, UDP is a connectionless protocol used for applications that require speed over reliability (like video streaming or gaming), and FTP is used for file transfers. However, none of these protocols are standard for direct database access in Kubernetes contexts, making TCP the appropriate choice for this situation.