When opening a file, use this method to determine whether a file exists before you attempt to open it:
a. ExistFile(filename)
b. IO.Exists(filename)
c. System.IO.File.Exists(filename)
d. System.File.Exists(filename)
c. System.IO.File.Exists(filename)
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Binary trees have been used
A) in compilers and interpreters to represent expressions B) in computer hardware to model branching patterns of electronic signals C) in the Java Collections Framework to internally implement the Vector class D) None of the above
Which type of request will always go to the name server that is authoritative for the domain that contains the requested name or address to make completely sure data is obtained directly from the source?
A. Root server B. Client server C. Mail server D. Cache server
Product-oriented firms manufacture _____.?
A. ?retail services B. ?routers C. ?computers D. ?microchips
Which layer of the OSI model provides a user interface in the form of an entry point for programs to access the network infrastructure?
A. Application B. Transport C. Network D. Physical