The third option
I think that is correct but please forgive me if I am incorrect
The protocols that would secure a tunnel for credential exchange using port 636 is Lightweight Directory Access Protocol Secure (LDAPS).
What is LDAPS?
Lightweight Directory Access Protocol Secure (LDAPS) is known to be a protocol that uses a PKI certificate to be able to secure LDAP connections over the network and it often uses TCP port 636.
Hence, The protocols that would secure a tunnel for credential exchange using port 636 is Lightweight Directory Access Protocol Secure (LDAPS).
Learn more about LDAPS from
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