Security group rules in AWS support the Internet Control Message Protocol (ICMP) and User Datagram Protocol (UDP) for defining inbound and outbound traffic rules. These protocols are commonly used for network communication and monitoring. The WGU Cloud Deployment and Operations Study Guide (Section
3.2, Security Groups) states, "Security groups support protocols like ICMP for diagnostic traffic and UDP for streaming or low-latency applications, allowing fine-grained control over instance access." BGP and MPLS are routing or network layer protocols not supported by security group rules.