In a three-level CA hierarchy, the middle-level servers are referred to as Intermediate type of CA.
A CA hierarchy begins with the root CA at the top. Under the root sit several intermediate CAs. The Root CA will give the intermediate CA certificate. The intermediate CA will then give another CA, one level down, or sign end commodity certificates.
The root CA is self-signed and marks all subordinate CAs instantly below it. These in turn sign the entities below them, either more subordinate CAs or the ultimate end entity certificates. You can view this hierarchy in motion by considering the details of any certificate.
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