How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Steve Herrod Your Own Question

Steve Herrod
Steve Herrod, Masters Degree
Category: Homework
Satisfied Customers: 2603
Experience:  BA (Hons) & MA Qualifications
65126503
Type Your Homework Question Here...
Steve Herrod is online now
A new question is answered every 9 seconds

Its due on SUNDAY ....Need help ASAP PLEASE

Resolved Question:

Computer and Number Systems


 


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. (10 pt) Define memory cache write-through and write-back techniques and describe the advantages and disadvantages of each. Input / Output


 


3. Answer the 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


 


4. 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


 


5. 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


 


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.


 


6. 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.


 


7 Operating Systems


 


 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) (5 pt) 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.


 


8. File Management


 


a. (5 pt) 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.


 


(ii) If the round robin scheduling algorithm is used, which process will finish first? At what time will it complete? b.


 


(5 pt) 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



 


 


 


___ Best-fit ___ Worst-fit


 


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

Submitted: 1 year ago.
Category: Homework
Expert:  Steve Herrod replied 1 year ago.

Steve Herrod :

Hi, I'll be happy to help with this - can you upload the questions in a document at all?

Steve Herrod :

I can have with you by late Saturday evening

Steve Herrod :

Let me know

Steve Herrod :

Cheers

Steve Herrod :

Steve

Customer:

Hello Steve thanks you

Customer:

for helping i am about to upload the in a document

Customer:


importunately i cant send it in a document. You do have an email i can sent you.

Steve Herrod :

You can send it toXXX@XXXXXX.XXX for my attention

Customer:

ok sure thanks

Steve Herrod :

And if you include a link to this question page I will receive the document

Customer:

I have sent the file

Customer:

i have deleted some question because i have been working on them

Customer:

have you recieved the document?

Steve Herrod :

Not yet but it will come via Customer Services so can be a short delay

Customer:

ohh ok is there any faster way i can you

Customer:

is there any faster way i can send you the document or do you have any personal email ?

Steve Herrod :

we can't use personal e-mail unfortunately

Steve Herrod :

you could use wikisend.com?

Steve Herrod :

if you go there and choose Upload

Steve Herrod :

attach the document and it will give you a file ID that I can use to download it from?

Customer:

cool let me try that

Customer:

File ID 468526

Steve Herrod :

Thanks - I have that now

Steve Herrod :

so I can work on that document and have with you by later today

Customer:

that sound good

Customer:

so where will you post the answers

Steve Herrod :

I'll send them in a link here

Customer:

oh ok

Steve Herrod :

similar to that wikisend you just created

Customer:

great..

Steve Herrod :

and you'll get an e-mail to notify you of the message

Customer:

nice

Customer:

your life saver

Steve Herrod :

no problem

Customer:

alright m stepping out of this chat...

Steve Herrod :

ok, catch you later

Customer:

yup bye :)

Steve Herrod :

cheers!

Steve Herrod :

This will be with you by 9AM Sunday

Steve Herrod :

Cheers

Steve Herrod :

Steve

Customer:

thats perfectly fine

Steve Herrod :

great

Steve Herrod :

File is here

Steve Herrod :

Cheers

Steve Herrod :

Steve

Customer:

I must say you did a great job ..thanks alot

Customer:

5 star

Steve Herrod, Masters Degree
Category: Homework
Satisfied Customers: 2603
Experience: BA (Hons) & MA Qualifications
Steve Herrod and 10 other Homework Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Manal Elkhoshkhany

    Tutor

    Satisfied Customers:

    4522
    More than 5000 online tutoring sessions.
< Last | Next >
  • http://ww2.justanswer.com/uploads/BU/BusinessTutor/2012-2-2_115741_Kouki2.64x64.jpg Manal Elkhoshkhany's Avatar

    Manal Elkhoshkhany

    Tutor

    Satisfied Customers:

    4522
    More than 5000 online tutoring sessions.
  • http://ww2.justanswer.com/uploads/ComputersGuru/2010-02-13_051118_Photo41.JPG LogicPro's Avatar

    LogicPro

    Engineer

    Satisfied Customers:

    3458
    Expert in Java C++ C C# VB Javascript Design SQL HTML
  • http://ww2.justanswer.com/uploads/LI/lindaus/2012-6-10_04811_IMG20120609164157.64x64.jpg Linda_us's Avatar

    Linda_us

    Finance, Accounts & Homework Tutor

    Satisfied Customers:

    3124
    Post Graduate Diploma in Management (MBA)
  • http://ww2.justanswer.com/uploads/chooser77/2009-08-18_162025_Chris.jpg Chris M.'s Avatar

    Chris M.

    M.S.W. Social Work

    Satisfied Customers:

    2385
    Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)
  • http://ww2.justanswer.com/uploads/JawaadAhmed/2009-6-27_12137_SIs_SHadi.jpg F. Naz's Avatar

    F. Naz

    Chartered Accountant

    Satisfied Customers:

    1988
    Experience with chartered accountancy
  • http://ww2.justanswer.com/uploads/JK/jkcpa/2011-1-16_182614_jkcpa.64x64.jpg Bizhelp's Avatar

    Bizhelp

    CPA

    Satisfied Customers:

    1876
    Bachelors Degree and CPA with Accounting work experience
  • http://ww2.justanswer.com/uploads/avremote/photoa.jpg Seanna's Avatar

    Seanna

    Tutor

    Satisfied Customers:

    1781
    3,000+ satisfied customers, all topics, A+ work