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.
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