It's the layer that defines the Actual physical properties from the transmission medium, including voltage levels, bit prices, connectors and cables. What's more, it handles the transmission and reception of bits around the medium. Explanation: The TCP/IP design consists of four layers: software, transportation, World wide web, and network entry. https://sparedirectory.com/listings813137/a-simple-key-for-outcall-massage-therapist-near-me-reviews-unveiled