Cisco 100-105 Exam

Which network device functions only at Layer 1 of the OSI model?

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D
  • E. Option E
Answer: Option B.
Explanation: 

Most hubs are amplifying the electrical signal; therefore, they are really repeaters with several ports. Hubs and repeaters are Layer 1 (physical layer) devices.

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