##### 7.1.2.3.1 Technically Constrained Non-TLS Subordinate CA Extensions | __Extension__ | __Presence__ | __Critical__ | __Description__ | | ---- | - | - | ----- | | `authorityKeyIdentifier` | MUST | N | See [Section 7.1.2.11.1](#712111-authority-key-identifier) | | `basicConstraints` | MUST | Y | See [Section 7.1.2.10.4](#712104-ca-certificate-basic-constraints) | | `crlDistributionPoints` | MUST | N | See [Section 7.1.2.11.2](#712112-crl-distribution-points) | | `keyUsage` | MUST | Y | See [Section 7.1.2.10.7](#712107-ca-certificate-key-usage) | | `subjectKeyIdentifier` | MUST | N | See [Section 7.1.2.11.4](#712114-subject-key-identifier) | | `extKeyUsage` | MUST[^eku_ca] | N | See [Section 7.1.2.3.3](#71233-technically-constrained-non-tls-subordinate-ca-extended-key-usage)| | `authorityInformationAccess` | SHOULD | N | See [Section 7.1.2.10.3](#712103-ca-certificate-authority-information-access) | | `certificatePolicies` | MAY | N | See [Section 7.1.2.3.2](#71232-technically-constrained-non-tls-subordinate-ca-certificate-policies) | | `nameConstraints` | MAY | \*[^name_constraints] | See [Section 7.1.2.10.8](#712108-ca-certificate-name-constraints) | | Signed Certificate Timestamp List | MAY | N | See [Section 7.1.2.11.3](#712113-signed-certificate-timestamp-list) | | Any other extension | NOT RECOMMENDED | - | See [Section 7.1.2.11.5](#712115-other-extensions) |