A possible weakness of the second-chance page-replacement strategy is that if the list of pages is short, then an active page that has just moved to the back of the list after having had its referenced bit set off could quickly move to the front of the list and be selected for replacement before its referenced bit is set on. Comment on this phenomenon. Is it an anomaly in second-chance page replacement? Defend your answer carefully.
What will be an ideal response?
This is not an anomaly. To move to the head of the list from the back, all other pages
must have been referenced more recently. Active pages will be replaced (regardless of the
page-replacement algorithm) if there is not enough memory to keep each process’s working
set in memory.
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The TreeSet class is built upon a backing instance of the TreeMap class. Discuss the advantages and disadvantages of this strategy for reuse.
What will be an ideal response?
The ____ user account has full access to all Linux machines on a network.
A. administrator B. supervisor C. root D. manager
What command below is used to test network connections by sending a request packet to a host?
A. ps B. ifconfig C. ping D. df
All of the following statements are TRUE about finding relationships in data EXCEPT:
A) The covariance and correlation formulas are used to describe linear relationships between data. B) Covariance is a formula that can calculate the relationship between two variables, like age and dollars spent as well as the direction of the relationship. C) The correlation formula produces a value between –.1 and 1 that is called the correlation coefficient. D) The correlation coefficient is represented by the letter "r" in statistics and is a unitless value that describes the strength and direction of a relationship between two variables.