What elements might the data link layer add to its pdu a physical addresses b logical addresses c data d crc?

The data link layer typically adds physical addresses (also known as MAC addresses) to its Protocol Data Unit (PDU) to ensure that data is delivered to the correct device on a local network. Additionally, it often includes a CRC (Cyclic Redundancy Check) for error detection, ensuring the integrity of the transmitted data. Logical addresses and the original data payload are not added at this layer; logical addressing is handled at the network layer above it.