Three computers together provide a replicated service. The manufacturers claim that each computer has a mean time between failure of five days; a failure typically takes four hours to fix. What is the availability of the replicated service?
What will be an ideal response?
The probability that an individual computer is down is 4/(5*24 + 4) ~ 0.03. Assuming failure-independence of the machines, 
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An IP address is __________.
a) a unique destination on the Internet. b) is the location of a resource on the Internet. c) is a component of a computer where datagrams are directed to be sent over a network. d) is another name for a hub in a star network.
Which of the following attacks requires the hacker to obtain several encrypted messages that have been encrypted with the same protocol?
a. Known plaintext attack b. Ciphertext-only attack c. Chosen plaintext attack d. Chosen ciphertext attack
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Answer the following statement true (T) or false (F)
A ____ virus is a common type of virus that is programmed into an attached macro file.?
A. ?boot sector B. ?macro C. ?polymorphic D. ?file infector