Discuss the relative merits of the rarest-first download policy in BitTorrent in comparison to the more traditional sequential download approach.
What will be an ideal response?
BitTorrent schedules downloads according to a rarest first policy, that is each peer maintains a record of the number of copies of each piece in its peer set (the set of connected peers) and, based on this data structure, schedules downloads by randomly selecting a piece from its rarest piece set. This ensures that rare items (including new items) spread quickly and hence this significantly increases the availability of pieces of data. The sequential download policy has no knowledge of availability of data and hence is not tailored towards this particular outcome.
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If the user clicks either the Cancel button in the dialog box or the Close button on the dialog box's title bar, the InputBox function returns ____.
A. an empty string B. the value contained in the input area of the dialog box C. CancelValue D. nothing
There are two types of data to enter: data that ________ every transaction, and data that concisely differentiate the particular item being processed from all other items.
A) change B) filter C) capture D) remove
Write a program that uses const_cast to modify a const variable. [Hint: Use a pointer in your solution to point to the const identifier.]
What will be an ideal response?
Which of the following ports would be commonly used for FTP traffic?
A. 20 B. 22 C. 23 D. 25