The ________ holds the address of the next instruction to be fetched.
A. IR
B. PC
C. MAR
D. MBR
B. PC
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The ________ cipher structure, which dates back over a quarter century and which, in turn, is based on Shannon’s proposal of 1945, is the structure used by many significant symmetric block ciphers currently in use.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about computing in the 1940s and 1950s is false?
a) The earliest digital computers of the 1940s and 1950s included operating systems. b) Programmers often entered programs in machine language one bit at time using mechanical switches. c) Machine-language programs could be entered using punched cards. d) all of the above
How much hands-on work experience with personal computing devices should a technician have before taking the A+ certification exams?
A. Six months B. months C. months D. hours
All rack-mounted equipment uses a height measurement known simply as a(n) ____________________.
Fill in the blank(s) with the appropriate word(s).