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In terms of PKI, subordinate CAs that issue certificates only to users and to other subordinate CAs are called _______.
leaf CAs
intermediate CAs
root CAs
RAs
The first CA that is installed becomes the root CA. A root CA issues certificates to subordinate CAs. The root CA never usually directly issues certificates to users, computers, applications or services. An intermediate CA is a subordinate CA that can issue certificates to other subordinate CAs or directly to users. While an intermediate CA is subordinate to the root CA, it is considered superior to those subordinate CAs to which it issued certificates. Subordinate CAs which only issue certificates to users, and not to other subordinate CAs, are called leaf CAs. An RA (Registration Authority) verifies user requests for digital certificates and tells the Certificate Authority (CA) to issue them. RAs do not issue certificates.
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