Kent wants to encrypt network traffic in transit. What cryptographic protocol is most frequently used to add encryption to existing protocols?

TLS, or Transport Layer Security, is a cryptographic protocol used to secure network traffic in transit. S/MIME, or Secure MIME, is used for digital signatures and encryption for email. MPLS is multiprotocol label switching, a network routing technique. SSH is Secure Shell and is used for encrypted command-line access as well as to tunnel other protocols in some cases.