While troubleshooting a client application connecting to the network, the security administrator notices the following error: Certificate is not valid.
Which of the following is the BEST way to check if the digital certificate is valid?
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A. B. C. D.B.
The best way to check if a digital certificate is valid is by using a Certificate Revocation List (CRL).
A CRL is a list of revoked digital certificates that have been issued by a Certificate Authority (CA). It is used to check whether a particular certificate has been revoked by the CA before its expiration date.
When a digital certificate is issued, it is assigned a unique serial number. If the private key associated with that certificate is compromised or if there are other security concerns, the CA will revoke the certificate and add its serial number to the CRL. The client application can then check the CRL to ensure that the certificate is still valid.
The other options listed in the question are not appropriate for checking the validity of a digital certificate in this context:
PKI (Public Key Infrastructure) is a system of digital certificates, certificate authorities, and other related components that enable secure communications over a network. It is not a tool for checking the validity of a specific certificate.
CSR (Certificate Signing Request) is a message sent from an applicant to a CA to request the issuance of a digital certificate. It is not used to check the validity of a certificate.
IPSec (Internet Protocol Security) is a protocol suite used to secure IP communications. It is not used to check the validity of a digital certificate.