AWS Certified Advanced Networking Specialty Practice Exam

A hospital is having connection issues with AWS PrivateLink. What is a potential issue they might face?

1. Sending traffic over User Datagram Protocol (UDP)

2. Using outdated hardware with no IPv6 support

3. Not having sufficient bandwidth available

4. Incorrect firewall rules in the provider VPC

The correct answer is: Sending traffic over User Datagram Protocol (UDP)

Using AWS PrivateLink allows secure access to services hosted on AWS without exposing them to the public internet. In this context, the potential issue of sending traffic over User Datagram Protocol (UDP) can arise from how PrivateLink functions. PrivateLink primarily supports TCP traffic, which is connection-oriented and ensures that packets are delivered in sequence and without loss. UDP, on the other hand, is a connectionless protocol that does not guarantee delivery, order, or integrity of data packets. Since PrivateLink typically operates with TCP and is designed to provide reliable communication, using UDP could lead to packet loss or connection issues, thereby resulting in communication failures when attempting to establish a connection to services through PrivateLink. The other options present a range of potential issues, but they relate to other aspects of connectivity, hardware limitations, or network setup rather than directly affecting the fundamental operation of AWS PrivateLink itself in the same way that using an unsupported protocol would. This protocol mismatch specifically highlights a critical aspect of how services are expected to communicate over PrivateLink, underscoring the importance of using a compatible traffic type.