Describe a classic programmable logic controller (PLC).
What will be an ideal response?
A classic programmable logic controller (PLC) is a computer that controls a machine according to a set of ordered steps. Take for example a machine that produces cakes. Each step in the process of producing a cake follows a certain pattern (add ingredients, mix, bake, etc.) that has to go in order and in the proper timing. The PLC monitors sensors (like timers and oven temperatures) and tells the machine when to do the next step in the process.
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Which of the following is false?
a. An entire non-char array cannot be input or output at once. b. Two arrays cannot be meaningfully compared with equality or relational operators. c. Arrays cannot be assigned to one another (i.e., array1 = array2;). d. C++ ensures that you cannot “walk off” either end of an array.
The sequence 10, 5, 9, 8, 4, 1, 23 has been put in a binary search tree. What is the LCA (Least Common Ancestor) of 9 and 4?
a. 5 b. 10 c. They don't have a parent node d. It can't be determined
Which of the following is the correct way to include an external DTD named mydtd.dtd which is stored in a folder named mysite in an XML document that has books as its root element?
a. ``` ``` b. ``` ``` c. ``` ``` d. ``` ```
Denial of service attacks target which of the following?
a. Availability b. Integrity c. Security d. Confidentiality