Final answer:
Decentralized communication and packet switching are the elements of the switching network envisioned by Paul Baran that enable all types of computers to communicate with each other.
Step-by-step explanation:
The elements of the switching network envisioned by Paul Baran that would enable all types of computers to communicate with each other are decentralized communication and packet switching.
Decentralized communication means that there is no central authority controlling the network, instead, each computer can communicate directly with other computers. Packet switching refers to the method of breaking data into small packets and sending them individually over the network, allowing multiple computers to share the network's resources efficiently.