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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Web 2.0 has led to a shift from just consuming content toward
a. spending all our time on leisure activities. b. less sharing of the work we produce. c. new standards for HTML. d. producing content.
What statement is true regarding a firewall on a computer that attaches to the network wirelessly? Note that the wireless network connects to the wired network for Internet access
A) The firewall can protect the computer but not the data sent between the computer and the access point. B) The firewall cannot protect the computer. C) The firewall can protect the computer only from other wireless NICs. D) The firewall can protect the computer only from viruses and spyware.