Explain why an analyst may use a black box symbol.
What will be an ideal response?
In data flow diagrams, a process symbol can be referred to as a black box, because the inputs, outputs, and general functions of the process are known, but the underlying details and logic of the process are hidden. By showing processes as black boxes, an analyst can create DFDs that show how the system functions but avoid unnecessary detail and clutter. When the analyst wishes to show additional levels of detail, he or she can zoom in on a process symbol and create a more in-depth DFD that shows the process’s internal workings—which might reveal even more processes, data flows, and data stores. In this manner, the information system can be modeled as a series of increasingly detailed pictures.
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Browsers request HTML pages from mail servers.
Answer the following statement true (T) or false (F)
Traceroute would be best suited for which of the following tasks?
A. testing layer 3 connectivity with a locally connected host B. testing DNS settings C. locating bottlenecks in a network D. determining network bandwidth
____________________ refers to the arrangement of data into tables and fields.
Fill in the blank(s) with the appropriate word(s).
srand
a) should be called before each call to rand b) should be used instead of rand to generate truly random numbers c) is unnecessary in C d) can use time as an automatically input seed value