Which two statements about the WAN OSI Layer 1 are true? (Choose two.)

Which two statements about the WAN OSI Layer 1 are true? (Choose two.)

• It describes how data will be encapsulated into a frame.
• It describes the electrical, mechanical, and operational components needed to transmit bits.
• It includes protocols such as PPP, HDLC, and Ethernet.
• It includes protocols such as SDH, SONET, and DWDM.

Explanation: The WAN OSI Layer 1 describes the electrical, mechanical, and operational components needed to transmit bits, and includes protocols such as SDH, SONET, and DWDM.

Exam with this question: 7.2.9 Check Your Understanding - WAN Operations