In which technology is network level encrypted not natively incorporated?

Kerberos is a ticket-based authentication protocol (RFC 4120) that verifies identities using a Key Distribution Center, but it does not natively encrypt the network traffic itself. It issues session keys used by applications to optionally encrypt communications, but network-level encryption is not built into the protocol. Encryption of the channel must be handled separately, for example by layering Kerberos over a TLS session.

SSL (Secure Sockets Layer) was explicitly designed to encrypt network communications at the transport layer, so encryption is natively incorporated.

TLS (Transport Layer Security) is the direct successor to SSL and natively provides network-level encryption for data in transit.

IPsec (Internet Protocol Security) operates at the network layer (Layer 3) and natively encrypts IP packets, making encryption a core part of the protocol.