Which of the following is the function of a power inverter?
A. Converts AC to DC
B. Provides a regulated AC voltage
C. Steps down AC voltages
D. Provides a backup power source
Answer: A. Converts AC to DC
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Consider a STUDENT relation in a UNIVERSITY database with the following attributes (Name, SSN, Local_phone, Address, Cell_phone, Age, GPA). Note that the cell phone may be from a different city and state (or province) from the local phone. A possible tuple of the relation is shown below:
a. Identify the critical missing information from the LocalPhone and CellPhone attributes as shown in the example above. (Hint: How do call someone who lives in a different state or province?)
b. Would you store this additional information in the LocalPhone and CellPhone attributes or add new attributes to the schema for STUDENT?
c. Consider the Name attribute. What are the advantages and disadvantages of splitting this field from one attribute into three attributes (first name, middle name, and last name)?
d. What general guideline would you recommend for deciding when to store information in a single attribute and when to split the information?
Remote wireless ____________________ can connect sites such as satellite offices, remote campus settings, or temporary office locations when the sites are separated by obstacles such as bodies of water, freeways, or railroads that make using a wired connection impractical or very expensive.
Fill in the blank(s) with the appropriate word(s).
The vertical space between the lines in a paragraph.
What will be an ideal response?
When working in a SOHO environment with a machine that has been infected with a virus, which of the following is the FIRST step the technician should take with the infected machine?
A. Remove the infected system from the network. B. Update the antivirus software with the newest definitions. C. Remove the user's permissions from the machine and then run a virus scan. D. Reboot the computer in Safe Mode and run a system scan.