# What is the purpose of Istio's 'subjectAltNames' field in DestinationRule?

Istio, Hard (Expert), Security. https://k8wiz.com/uquiz/what-is-the-purpose-of-istios-subjectaltnames-field-in-destinationrule

- A. To specify alternative names for the service
- B. To specify the Subject Alternative Names for certificate verification
- C. To define alternative subjects for authorization
- D. To provide aliases for the service

**Answer:** To specify the Subject Alternative Names for certificate verification

**Explanation:** The 'subjectAltNames' field in Istio's DestinationRule is used to specify the Subject Alternative Names for certificate verification. It allows you to specify which SANs should be expected in the server certificate when establishing TLS connections.