CyberCertPrepNetwork FundamentalsOSI & TCP/IP ModelsEASYFree question
Which layer of the OSI model is responsible for converting digital bits into electrical, optical, or radio signals for physical transmission?
- A.Layer 2 (Data Link)
- B.Layer 1 (Physical)
- C.Layer 3 (Network)
- D.Layer 4 (Transport)
Why B is correct
Layer 1 (Physical) deals with the physical medium: electrical voltages (copper Ethernet), light pulses (fiber optic), or radio waves (Wi-Fi). It defines cable types, connector specifications (RJ45, SFP), signaling methods, bit rates, and encoding schemes (e.g., 4B/5B, 8B/10B). Layer 2 (Data Link) operates above this, packaging bits into frames with MAC addresses.
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