Are L2TP, IPsec and IKE/IKEv2 separate types of VPNs or not?

Question

VPN

I'm kind of confused about these kinds of VPNs. Please explain which of them are separate, self-sufficient types of VPN, and which are not? So far, I understand it this way:
1. L2TP is a self-sufficient protocol, but does not encrypt the connection. Uses UDP port 1701.
2. IPsec has two modes - transport, which is used primarily for L2TP encryption, and tunnel, which is already a self-contained VPN. Port - ?
3. IKE/IKEv2 Sometimes referred to as one of the protocols in the IPsec protocol suite, sometimes referred to as a VPN in its own right. Uses UDP ports 500 and/or 4500
Which of these is correct?

Answer 1

I wonder which is easier - ask on a toaster or read Wikipedia ?
IPSec is a family of protocols that includes AH (Authentication Header), ESP (Encapsulated Security Payload), and ISAKMP (Internet Security Association Key Management Protocol).
Both versions of IKE are part of the ISAKMP protocol used for key exchange and initial negotiation. But others can also be used (I haven’t seen it live).
The main port is 500. Port 4500 is used if NAT-T is detected
This is not a VPN. And not VPN types. These are the protocols. And what of them can be built - yes, anything, including VPN.