# Which challenge type is NOT supported by the ACME issuer in cert-manager?

cert-manager, Medium (Advanced), Concepts. https://k8wiz.com/uquiz/which-challenge-type-is-not-supported-by-the-acme-issuer-in-cert-manager

- A. HTTP-01
- B. DNS-01
- C. TLS-SNI-01
- D. TLS-ALPN-01

**Answer:** TLS-SNI-01

**Explanation:** TLS-SNI-01 is not supported by the ACME issuer in cert-manager as it has been deprecated by Let's Encrypt due to security concerns. The supported challenge types are HTTP-01, DNS-01, and TLS-ALPN-01.