Cisco Certified Network Associate (CCNA) Practice Exam

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What type of modem is specifically designed for leased line connections?

  1. Cable modem

  2. DSL modem

  3. CSU/DSU

  4. Router modem

The correct answer is: CSU/DSU

A CSU/DSU, or Channel Service Unit/Data Service Unit, is specifically designed for leased line connections, which often use dedicated lines provided by telecommunications carriers. The CSU/DSU serves as a bridge between the router or network device and the digital circuit, managing the connection and ensuring that the signals are reformatted for proper communication over the leased line. In contrast, other types of modems, such as cable modems and DSL modems, are used for residential or small business broadband access, connecting to cable or DSL lines rather than leased lines. A router modem, typically combines the functionalities of a router and a modem, but is not designed for dedicated leased line services. This specificity of the CSU/DSU in handling leased line connections makes it the correct choice for this question.

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