Multiple choice cisco-ccna

Which of the following is a digital-interface device used to connect a router to a digital circuit like a T1?

  1. A channel service unit/digital service unit (CSU/DSU)

  2. An Ethernet card

  3. DTE

  4. None of the above.

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A Correct answer
Explanation

A CSU/DSU (Channel Service Unit/Digital Service Unit) is the device that connects a router's serial interface to a digital circuit like T1/E1. It performs signal conversion, timing, and line termination functions. An Ethernet card connects to LAN networks, DTE is the router itself (Data Terminal Equipment), and the CSU/DSU is specifically required for WAN digital circuit connections.