Practice Quiz

CompTIA Network+

Category - Media & Topologies

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Which of the following highlights the difference between a smart jack and a simple NID?
  1. A smart jack is solely used to diagnose line faults in telephone lines that carry DSL signals
  2. A smart jack acts as a lightning arrestor in addition to its capabilities as a NID
  3. A smart jack can automatically fix any issues within the telephone wiring
  4. A smart jack is a type of NID that has diagnostic capabilities
Explanation
Answer: D -A smart jack is a type of Network Interface Device, or NID, that has diagnostic capabilities.

Key Takeaway: The network interface device, or NID, is a device that serves as the demarcation point between the carrier's local loop and the customer's premises wiring. NIDs that provide several diagnostic capacities are colloquially called smart jacks as an indication of their built-in intelligence. They are typically used for more complicated types of telecommunications service, such as T1 lines.
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