# What is the default protocol used by Istio for service-to-service communication?

Istio, Easy (Beginner), Networking. https://k8wiz.com/uquiz/what-is-the-default-protocol-used-by-istio-for-service-to-service-communication

- A. HTTP/1.1
- B. HTTP/2
- C. gRPC
- D. TCP

**Answer:** HTTP/2

**Explanation:** Istio uses HTTP/2 as the default protocol for service-to-service communication. HTTP/2 provides features like multiplexing, header compression, and server push that make it well-suited for microservices communication.