What does the "CN" stand for in the subject line of a Kubernetes certificate?

What does the "CN" stand for in the subject line of a Kubernetes certificate?

• A. Organization
• B. Common Name
• C. Certificate Name
• D. Canonical Name

Answer: (B)

Common Name is what CN stands for in a certificate’s subject. In X.509 certificates, the subject includes attributes like CN, O, OU, and C, where CN identifies the entity the certificate represents—such as the server or user. In Kubernetes tls use, the CN can indicate the certificate’s identity, while the Subject Alternative Name (SAN) lists the DNS names or IP addresses the certificate is valid for. This is why the term Common Name is the correct interpretation of CN. Other options refer to different, nonstandard or different fields (for example, Organization is a separate attribute, while Certificate Name and Canonical Name aren’t the standard subject fields). Example: Subject contains CN=kube-apiserver, illustrating the identity the certificate is for.

Common Name is what CN stands for in a certificate’s subject. In X.509 certificates, the subject includes attributes like CN, O, OU, and C, where CN identifies the entity the certificate represents—such as the server or user. In Kubernetes tls use, the CN can indicate the certificate’s identity, while the Subject Alternative Name (SAN) lists the DNS names or IP addresses the certificate is valid for. This is why the term Common Name is the correct interpretation of CN. Other options refer to different, nonstandard or different fields (for example, Organization is a separate attribute, while Certificate Name and Canonical Name aren’t the standard subject fields). Example: Subject contains CN=kube-apiserver, illustrating the identity the certificate is for.