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The key is the private cryptographic information used for encrypting traffic.
The certificate is the public cryptographic information used for encrypting traffic.
https://en.wikipedia.org/wiki/Public-key_cryptography
If you want to terminate SSL on your F5, you need both the key and certificate installed and configured in an SSL profile. Depending on your use case you may need an intermediate certificate configured in your SSL profile as well, which the Certificate Authority can provide.
Hope this answers your question!
Thank you so much for confirming this for me. Can we say in any cases, once the certificate need to import to F5, the Key also need to import to the F5? If so, why do not put the certificate and its key together, and then import it for one time?