CompTIA Network+ N10-006 Q755

All users have lost Internet connectivity but can still reach internal applications. The technician can ping the router. A faulty T1 connection has been ruled out by the LEC. Which of the following should the technician do to resolve this issue?

A. replace the CSU/DSU
B. replace the smart jack
C. restart DNS services
D. restart DHCP services

Correct Answer: C