Why do wireless networks not use CSMA/CD to detect and avoid network collisions?
What will be an ideal response?
CSMA/CD won't work for wireless networking because wireless devices simply can't detect collisions, for two reasons. First, radio is a half-duplex transmission method. Wireless devices cannot listen and send at the same time. Second, wireless node A wanting to communicate with wireless node B can't hear the third, hidden node (Wi-Fi C) that's also trying to communicate with B. A collision might occur in that circumstance.
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What names are displayed in the list box when the button is clicked on?
``` Private Sub btnDisplay_Click(...) Handles btnDisplay.Click Dim file As String = "Ships.txt" Dim ships() As String = FillArray(file) lstBox.Items.Add(ships(2)) lstBox.Items.Add(ships.Min) End Sub Function FillArray(file As String) As String() Dim names() As String = IO.File.ReadAllLines(file) Return names End Function ``` Assume the three lines of the file Ships.txt contain the following entries: Pinta, Nina, Santa Maria (A) Pinta and Nina (B) Santa Maria and Pinta (C) Nina and Santa Maria (D) Santa Maria and Nina
What are the four basic symbols used in data flow diagrams.
What will be an ideal response?
What is the advantage of creating a form with a subform?
What will be an ideal response?
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?As the accompanying figure illustrates, the _____ changeover method allows the new system to be implemented in stages, or modules.
A. ?phased operation B. ?parallel operation C. ?pilot operation D. ?direct cutover