CCNA (200-301) WAN Practice Questions

CSU/DSU Interface

Home     Previous      Next

Q3. Your router is connect to the service provider through a CSU/DSU. Choose appropriate interfaces used in correct order, starting from the router interface.

A. 60-pin D-shell connector --> EIA/TIA 232 --> RJ 45

B. 60-pin D-shell connector --> RJ 45 --> EIA/TIA 232

C. RJ 45 --> 60-pin D-shell connector --> EIA/TIA 232

D. EIA/TIA 232 --> RJ 45 --> 60-pin D shell connector

Correct Answer: A


Traditionally, the router interface on a serial link is a 60-pin D-shell connector. The CSU/DSU may have EIA/TIA 232 interface to the router. The CSU/DSU interface to the service provider could be RJ-11, RJ-45 etc.

Home     Previous      Next

Disclaimer: All Simulation Exams practice tests, study guides and/or material are neither sponsored by, nor endorsed by, nor affiliated with Cisco® Systems or any other company. All trademarks are trademarks of their respective owners and duly acknowledged. CCNA, CCENT, ICND2, CCNP, CCIE,CCDA are registered trade marks of Cisco®Systems. The practice tests material is a copyright of and the same is not approved or endorsed by respective certifying bodies. Thank-you for your interest in Simulation Exams. Please see read me file before you download, install, and/or use any software from For any information or questions regarding this Website, please e-mail webmaster at