Question: When CQ University's computers began acting sluggishly, computer operators were relieved when a software trouble-shooter from DELL called. When he offered to correct the problem

When CQ University's computers began acting sluggishly, computer operators were relieved when a software trouble-shooter from DELL called. When he offered to correct the problem they were having, he was given a login ID and password. The next morning, the computers were worse. A call to DELL confirmed the university's suspicion: someone had impersonated a DELL repairman to gain unauthorized access to the system and destroy the database. CQ University was also concerned that the intruder had devised a program that would let him get back into the system even after all the passwords were changed.

What techniques could the imposter have implemented to breach the university's internal security?

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