The review information is used by the electronic industry publishing agency and the top analysis and understanding of the topic. "Started watching, seeing, finding the error, the answer, the answer, the answer, and the answer on the Chinese system analyst website Inconsistent, write it out, I hope to give pointers to comrades in review, learn together. "Computer and Software Engineering Knowledge" 1, (Page369, Example 2) Safety Mechanism is a technical means to realize security services, one security mechanism can provide many security services, and a safety service can also adopt a variety of security mechanisms. . The security service that the encryption mechanism cannot be provided is _____ a, data confidentiality B, access control C, digital signature D, and the reference answer on the certification book is C: digital signature and the answer on the CSAI is B: Access control. 2, (Page343 Example 19 June 2004 Test 50) From the basic CPU working principle, if the CPU executes the MOV R1, the R0 command (that is, the content of the register R0 is transmitted to the register R1), the CPU first is completed. The operation is ____ (where the PC is the program counter, m is the main memory, the DR is the data register; IR is the instruction register; Ar is the address register). A, R0-> R1 B, PC-> Ar C, M-> DR D, DR-> IR book Reference answer is C: M-> DR, the reason for the registers separated from each other. The answer to the CSAI is B: PC-> AR 3, (2000 test 11) In the computer of the pipeline structure, it will seriously affect the efficiency of the machine when frequent conditional transfer instructions. When there is an interrupt request, it will use an inaccurate breakpoint method, it will only affect the interrupt reaction time, and does not affect the correct execution of the program. B, not only affect the interrupt reaction time, but also affect the correct implementation of the program. C does not affect the interrupt reaction time, but the correct implementation of the program is not affected. D, does not affect the interrupt reaction time, and does not affect the correct execution of the program. The answer is B. Individual thinks should be A, if it affects the correct operation of the program, is this interrupt law meaningful?
