Question: When an Interconnection Certification Authority (CA: Certification Authority) is removed from a telecom network, what is the required action for its unexpired certificates issued to Security Edge Protection (SEG) or Transport Layer Security (TLS) CAs?
Option 1: Immediately revoke all certificates and update Certificate Revocation Lists (CRLs) and Online Certificate Status Protocol (OCSP) servers.
Option 2: Allow the certificates to expire naturally without updating CRLs or OCSP servers, as they are tied to the removed CA.
Option 3: Transfer certificate management to another trusted Interconnection CA before removal.
Option 4: Notify all affected SEG and TLS CAs but do not necessarily update CRLs or OCSP servers.
Explanation: When an Interconnection CA is removed, ensuring the security of the network is paramount. Allowing unexpired certificates to remain valid without a way to verify their status (via CRLs or OCSP servers) could pose a security risk. Thus, immediately revoking these certificates and updating the relevant lists/servers is necessary to maintain network integrity. This action ensures that any attempt to use a certificate from the removed CA will be identified as revoked, enhancing overall network security.