The computer has a ________ that works like a wristwatch

Which of the following is not one of the six logical units of a computer?

a. Input unit. b. Output unit. c. Central processing unit. d. Printer unit.

A ____ attack automatically directs browsers on many machines to a single web address at roughly the same time, causing so much network traffic to that site that it is effectively shut down to legitimate users.

A. denial-of-use B. trial-of-service C. trial-of-use D. denial-of-service