The network administrator has configured the enterprise firewall to permit port 21 to allow FTP transfers to occur from outside the enterprise. Users can connect to the FTP server that is located on the enterprise network. However, file transfers fails. Why could this be?
UDP port 21
TCP port 20
TCP port 21
UDP port 20
TCP port 20
TCP port 21
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Is there an error?
What will be an ideal response? ``` class B { public: void virtual f(); }; void B::f() {/*. . . */} ```
What is stored inside the variable value after the following line of code is executed?
``` var value = navigator.appVersion; ``` a) It stores the type of browser that the user is using. b) It stores an integer representing the version of the browser. c) It stores a string representing the version of the browser and other information. d) The navigator object does not contain an attribute named appVersion.
Wrapper class objects are mutable.
Answer the following statement true (T) or false (F)
COGNITIVE ASSESSMENT Which of the following statements is not a safeguard against the failure of hardware?
A. surge protectors B. fault-tolerant computers C. device-tracking apps D. UPS