You use a port scanner to scan a system and find port 80 open. What type of service is most likely running on that system?
a. FTP server
b. Web server
c. DNS server
d. Telnet server
ANS: B
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What cell phone technology is the most popular in the United States?
A. GSM B. CDMA C. EDGE D. SIM
Which of the following statements is true about an image map?
A) In HTML, an image map must be defined either a name or an id attribute. B) Neither XHTML nor HTML requires a name or id attribute when creating an image map. C) In XHTML, an image map should be defined using both a name and an id attribute. These attributes should have different names. D) An image map should be defined using both a name and an id attribute in order to satisfy requirements of both XHTML and HTML. These attributes should have same names.
A(n) ____ is a data structure that enforces first-come, first-served access to a single resource.
A. queue B. CPU C. set D. collection
Describe the relationship between mathematical relations and relations in the relational data model?
D1 ? D2 ? . . . ? Dn ? {(d1, d2, . . . , dn) | d1 ??D1, d2 ??D2, . . . , dn ??Dn}