PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
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Chapter 14, Problem 33RQ
Program Plan Intro

Data transmission:

  • Data transmission is defined as the method of transmitting the data between two or more devices.
  • The transmitted data can be either in analog form or digital form.
  • The two different methods used to transmit data are as follows:
    • Serial transmission
      • In serial data transmission, each bit of binary data is transmitted at a time sequentially.
    • Parallel transmission
      • In parallel data transmission, all bits of binary data are transmitted at the same time simultaneously.

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Now unmount the filesystem. Create a sparse image file, called book.img, of the 2GiB hard drive. Use a hexdump program to look at book.img and work out the offsets that store the contents of the book youdownloaded. Record the offsets as a sequence of one or more ranges of hexadecimal numbers. For example, in the following hexdump the text The rain in Spain falls mainly on the plain. is stored at 0x10-0x1f, 0x30-0x4b (inclusive). 00000000: 0000 0000 0000 0000 0000 0000 0000 0000 .................00000010: 5468 6520 7261 696e 2069 6e20 5370 6169 The rain in Spai00000020: 0000 0000 0000 0000 0000 0000 0000 0000.................00000030: 6e20 6661 6c6c 7320 6d61 696e 6c79 206f n falls mainly 000000040: 6e20 7468 6520 706c 6169 6e2e 0000 0000 n the plain........ Compress the filesystem using gzip by running: #gzip book.img This should leave you with a file book.img.gz. You will use scp to transfer this file in a later task. Enter your ranges in answers2.json as the answer for question1. To…
Task 4: Examine floppy.img Mount floppy.img at a suitable mountpoint inside your VM. Look inside the mountpoint directory. You should see a number of files in the top-level directory. Look inside your answers2.json at the strings labelled contentA and contentB. Exactly one of those two strings appears as the content of a file in the floppy disk's filesystem. I.e., there is a file that contains contentA or a file that contains contentB but not both. Additionally, the other string has been written into unused space of the floppy disk, so the data is in floppy.img but cannot be seen inside any of the files at the mountpoint. However it can be seen in a hexdump of floppy.img. I.e., if there is a file that contains contentA then contentB has been written into unused space. You must search through your mountpoint directory to find out which of contentA and contentB is stored in a file of the filesystem and which is stored in unused space. Suppose that contentA is stored in a file, and…
Download your personalized assignment files, answers2.json and floppy.img, into your Kali Linux Vm. Use wget as before. For example, you'd use "wget

Chapter 14 Solutions

PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA

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