Computer and Number Systems – IFSM 310 EXAM

| September 29, 2018

1. (10 pt) You have
been hired to develop a website-based sales system for a large international
retail firm. List and describe at least four features that are specific to the
Web design of your system and customer service important to consider if your system
is to be successful at attracting and keeping customers living outside of the
US. Include not only characteristics of the user interface, but those issues
that must be uniquely addressed to successfully service your non-US customers.

?
2. (2.5 pt each) In order to receive credit for
these problems, you must show all of the steps you took to arrive at your
answers.
(c) Convert the following decimal number to
binary:
21842
(d) Convert the following binary number to
decimal:
11000111011.101

(c) Convert the following hexadecimal number to
decimal:
CA97
(d) Convert the following binary number to
hexadecimal:
1110011111011010100?
CPU and Memory
3. (10 pt) ASCII, Unicode, and EBCDIC are, of
course, not the only numeric / character codes. The Sophomites from the planet
Collegium use the rather strange code shown in the Figure below. There are only
thirteen characters in the Sophomite alphabet, and each character uses a 5-bit
code. In addition, there are four numeric digits, since the Sophomites use base
4 for their arithmetic. Given the following Sophomite sequence, what is the
corresponding binary message being sent by the Sophomites?

(HINT: Decode the sequence reading from left to
right then write the corresponding binary sequence, leaving a space between
each binary sequence.)
?
4. (10 pt) Define memory cache write-through and
write-back techniques and describe the advantages and disadvantages of each.?
Input / Output
5. Answethe follow questions about interrupts.
a. (5 pt) Describe in detail the steps that
occur when a system receives an interrupt.

b. (5 pt) Describe how these steps differ in the
case when a system receives multiple interrupts
?
Computer Systems
6. Answer the following questions about
clusters.
a. (5 pt) Describe how you might use a cluster
to provide fault-tolerant computing
b. (5 pt) Describe how you might use a cluster
architecture to provide rapid scalability for a Web-based company experiencing
rapid growth.
Networks
7. Answer the following questions about
communication protocols.
a. (5 pt) Using the operations of UDP (User
Datagram Protocol) and TCP (Transmission Control Protocol) as a basis,
carefully explain the difference between connectionless and connection-oriented
communication.
b. (5 pt) If you were ordering a number of items
from an online seller, such as amazon.com, which Protocol (TCP or UDP) would
you recommend and explain why.
?
8. In the context of network security,
a. (3 pt) explain the purpose of
non-repudiation.
b. (3 pt) How does non-repudiation differ from
authentication?

c. (4 pt) Create a business scenario that
illustrates the importance of each.
?
Data Communications

9. (2 pt each) Circle or highlight the correct
answer to the following questions / statements about data communications:

(a) What characteristic of an analog signal is
measured in Hertz, or cycles per second?

a. Amplitude c. Phase

b. Frequency d. Skew

(b) What measurement unit describes the speed
and capacity of a communication channel?

a. Throughput c. Response Time

b. Access Time d. Data Transfer Rate

(c) ____ can be produced by a variety of
sources, including electric motors, radio equipment, and nearby power
transmission or communication lines.

a. EMI c. Distortion

b. Attenuation d. Signal/noise (S/N) ratio

(d) A(n) ____ can extend the range of an
electrical signal by boosting signal power to overcome attenuation.

a. repeater c. amplifier

b. return wire d. signal wire

(e) Which of the following does not allow
multiple messages to be carried on a single channel?

a. time division multiplexing c. packet
switching

b. frequency division multiplexing d.
half-duplex
?
Operating Systems

10. Answer the following questions about user
interfaces:
(a) (5 pt) List and explain at least two of the
definite advantages to the use of a command line interface (CLI) over
other types of interfaces.(b) There are some capabilities that
are easy to achieve with a GUI (graphical user interface), but much more
difficult with a CLI. Describe at least two of these capabilities.11.
Answer the following:a.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 25 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 30 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 15 seconds and a priority of 3
Process
4 has a total run time of 20 seconds, a priority of 2, but it will require
15 seconds of I/O after 5 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 and
explain your answer..0pt;margin-bottom:
0in;margin-left:.25in;margin-bottom:.0001pt;tab-stops:63.0pt 1.0in”>(ii)If the round robin scheduling algorithm
is used, which process will finish first?
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 40 KB program requirement under the conditions
of:

0-15 KB

15-40 KB

40-125 KB

125-155 KB

155-275 KB

275-330 KB

330-420 KB

420-470 KB

470-505 KB

occupied

Hole A

occupied

Hole B

occupied

Hole C

occupied

Hole D

occupied

Internet
12.Show the bit pattern in an asynchronous
transmission with evenparity if the
data to be sent is the character string “EXAMS”. Use 7-bit ASCII code found in Englander’s Figure 4.3
(page 102) and be sure to include start and stop bits..0pt;margin-bottom:
0in;margin-left:.25in;margin-bottom:.0001pt;tab-stops:63.0pt 1.0in”>

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