कौन सा संचार मोड दोनों दिशाओं में डेटा संचरण का समर्थन करता है, लेकिन एक समय में केवल एक ही दिशा में?

Which switching technique establishes a dedicated end-to-end physical communication path between the source and destination before data transmission begins?

In computer networks, combining multiple signals into a single signal for transmission over a shared physical medium is called _______.