The following data stream is received on a USB 2.0 data link. What is the actual source data stream?
000101111110111111011111101101111101111110111
USB uses NRZI (non?return to zero invert) encoding. A 1 is represented by no change in signal level and a 0 by a
change in level. A constant sequence of 1s is represented by a constant level. That is not practical, because a clock
is needed to separate the bits. In order to ensure sufficient signal transitions, bit stuffing is used. After every six
bits in the data stream a 1 is inserted at the transmitter. At the receiver, the zero following six ones in a data
message is deleted. In this case:
000101111110111111011111101101111101111110111 becomes
00010111111111111111111110111110111111111
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Securing backups with password protection gives added protection. However, if the backup program does not support password protection, what must be done to the backup media to keep it secure?
a. Leave it on the system that was backed up. b. Place it on your supervisor's desk. c. Physically secure it to prevent access. d. All answers provided are correct.
Given the following pseudocode, how many conditions will be tested if 70 is input?
``` Start Read GRADENUM CASENTRY GRADENUM CASE 60 < GRADENUM ? 80 GRADE = “A’ CASE 59 ? GRADENUM ? 70 GRADE = “B’ CASE 50 < GRADENUM ? 60 GRADE = “C’ CASE other GRADE = “No Grade” ENDCASE Write GRADE Stop ``` a) 1 b) 2 c) 3 d) 4