Discussion Question 10: A bank in California has 13 branches spread throughout northern California, each with its own minicomputer where its data are stored. Another bank has ten branches spread throughout California, with the data being stored on a mainframe in San Francisco. Which system do you think is more vulnerable to unauthorized access? Excessive losses from disaster?

Discussion Question 15: An organization’s internal audit department is usually considered an effective control mechanism for evaluating the organization’s internal control structure. Birch Company’s internal auditing function reports directly to the controller. Comment on the effectiveness of this organizational structure.

Problem 2 INTERNAL CONTROL Required: Identify the control weaknesses present and make a specific recommendation for correcting each of the control weaknesses.

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Problem 5 DISASTER RECOVERY PLAN:
Required:
a. Describe the computer security weaknesses present at Hill Crest Corporation that made it possible for a disastrous data loss.
b. List the components that should have been included in the disaster recovery plan at Hill Crest Corporation to ensure computer recovery within 72 hours.
c. What factors, other than those included in the plan itself, should a company consider when formulating a disaster recovery plan?

Problem 6: Per the article The Kiss of Identity Theft – Password Simplicity and Redundancy, which of the following statements is true?
I. Hackers who use powerful computers can break passwords containing dictionary words 100 times faster.
II. Adding just one capital letter and one asterisk would change the processing time (for a hacker) from 2.4 days to 2.1 centuries.

Both are true.
Neither are true.
I.
II.

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Review Question 1: Why is human behavior considered one of the biggest potential threats to operating system integrity?

Review Question 2: Why would a systems programmer create a back door if he or she has access to the program in his or her day- to- day tasks?

Chapter 16 Problem 4 INTERNAL CONTROL AND FRAUD
Required:
a. What weaknesses in the organization’s control struc-ture must have existed to permit this type of embez-zlement?
b. What specific control techniques and procedures could have helped prevent or detect this fraud?

Chapter 16 Problem 6 PREVENTIVE CONTROLS Listed here are five scenarios. For each scenario, discuss the possible damages that can occur. Suggest a pre-ventive control.
a. An intruder taps into a telecommunications device and retrieves the identifying codes and personal identification numbers for ATM cardholders. ( The user subsequently codes this information onto a magnetic coding device and places this strip on a piece of cardboard.)
b. Because of occasional noise on a transmission line, electronic messages received are extremely garbled.
c. Because of occasional noise on a transmission line, data being transferred is lost or garbled.
d. An intruder is temporarily delaying important strategic messages over the telecommunications lines.
e. An intruder is altering electronic messages before the user receives them

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1. Create a list of at least four of the important protocols that are members of the TCP/IP protocol suite (OTHER THAN TCP and IP) and the layer in which they operate. Explain how each protocol contributes to the operation and use of the Internet.

2. If you were building a computer to be used in an Earth to Mars voyage, would you be likely to use some form of flash memory or RAM as main memory? Describe the critical advantages and disadvantages of each when operating in this environment and explain why your choice makes the most sense.

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3.Consider the interface between a computer and a printer. For a typical printout it is clearly impractical to send output data to the printer one byte or one word at a time (especially over a network!). Instead, data to be printed is stored in a buffer at a known location in memory and transferred in blocks to memory in the printer. A controller in the printer then handles the actual printing from the printer’s memory.

The printer’s memory is not always sufficient to hold the entire printout data at one time. Printer problems, such as an ‘‘out of paper’’ condition, can also cause delays. Devise and describe, in as much detail as you can, an interrupt/DMA scheme that will assure that all documents will be successfully printed.


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4. Discuss the major differences, similarities, advantages, and disadvantages between bus I/O and channel I/O.

5.Discuss the trade-offs between bus-based and switched Ethernet. State the various conditions under which one or the other would be preferred and explain why.

6. There are four different ‘‘addresses’’ that are normally used during the passage of a message from source to destination using TCP/IP and Ethernet. These include a ‘‘user-friendly’’ address, a port number, an IP address, and a physical address. For each ‘‘address’’ state which layer or pair of layers uses that address and explain carefully how the address is used.

7. What operating system functions would you expect to find in the computer that is built in to control your automobile, and which functions would be omitted? Provide at least two of each. Justify your answer.

8. Use the following four processes that have arrived in the ready queue in the sequence shown below and answer the following about process scheduling:
Process 1 has a total run time of 20 seconds and a priority of 2, but it will require 15 seconds of I/O after 10 seconds of execution
Process 2 has a total run time of 25 seconds, a priority of 1, but it will require 10 seconds of I/O after 20 seconds of execution
Process 3 has a total run time of 5 seconds and a priority of 3
Process 4 has a total run time of 30 seconds, a priority of 1, but it will require 20 seconds of I/O after 10 seconds of execution
(i)Both shortest job first and non-preemptive priority queue scheduling algorithms will complete all four processes at the same time, but not in the same order. In which algorithm will Process 1 finish first? Provide the time Process 1 finishes for each algorithm and explain your answer.

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(ii) If the round robin with priority queues scheduling algorithm is used, which process will finish second? At what time will it complete?
b.Using a variable-partitioned multiprogramming memory, which of the four holes shown below will be used to satisfy a 35 KB program requirement under the conditions of:

0-15 KB	15-40 KB	40-125 KB	125-155 KB	155-275 KB	275-315 KB	315-420 KB	420-465 KB	465-505 KB
occupied	Hole A	occupied	Hole B	occupied	Hole C	occupied	Hole D	occupied

___ Best-fit

___ Worst-fit

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