aoua الحلول المضمونة 0544321455 حل واجبات الجامعة العربية المفتوحة (جروب الامتياز)

حل واجبات الجامعة العربية المفتوحة O54.4.3.2.1.4.5.5 - OO96654.4.3.2.1.4.5.5
ايميل : a_al_shora @ h.o.t.m.ail.c.o.m
سكايبي: a_al_shora
واتس اب: OO96654.4.3.2.1.4.5.5
Tutor-Marked Assignment

Cut-Off Date: xx/xx/xxxx
Total Marks: 40

Question One (12 Marks)
Given the following spreadsheet which shows the population in several countries between 2011 and 2014 inclusive as stated in https://data.worldbank.org/indicator/SP.POP.TOTL.
Use the excel file provided with the TMA file and answer the following questions.

Country Name Population in 2011 Population in 2012 Population in 2013 Population in 2014
Nigeria 164,192,925 168,833,776 173,615,345 178,516,904
France 65,338,149 65,635,082 65,920,302 66,201,365
Australia 22,340,024 22,728,254 23,125,868 23,490,736
Brazil 196,935,134 198,656,019 200,361,925 202,033,670
USA 311,721,632 314,112,078 316,497,531 318,857,056
Canada 34,342,780 34,754,312 35,158,304 35,540,419
China 1,344,130,000 1,350,695,000 1,357,380,000 1,364,270,000


a) Create a column chart taking into account the following chart options. (Paste the chart in the TMA file taking into consideration that all the following points are clear in the pasted version.)

1) A column chart

2) The x-axis represents the country name. (1Mark)
3) Series represents columns 2, 3, 4 and 5. (4Marks)

4) Write a chart title. (1 Mark)

5) Write a title for the x-axis. (1 Mark)

6) Write a title for the y-axis. (1 Mark)

7) Legend position in bottom. (1 Mark)


b) Based on the population data provided in the above table, can you predict what will happen for the population of the mentioned several countries in the coming years? (3 Marks)

Question Two (14 Marks)
Part 1 of Block 4 discussed telehealth for providing clinical health care at a distant. Teledentistry is a category of telemedicine field.


****** the web and answer the following.

a) Define Teledentistry? (2 Marks)




b) A typical store-and-forward teledentistry system consists of several devices, list three of them?
(6 Marks)

c) Teleconsultation through teledentistry can take place in a way such as “Store-and Forward Method”. Mention other two ways? (4 Marks)

d) List two references you have used in Teledentistry. (Wikipedia is not counted) (2 marks)

Question Three (14 Marks)
Consider a main system with unknown availability. Also, consider a backup system with an availability of 96.3% is used. (Assume the backup system comes into operation immediately if the main system fails.). The combined system with availability of 93.3147%.

Answer the following questions: (14 Marks)

a) Calculate the availability value of the main system? (8 Marks)

b) Calculate the unavailability value of the main system? (2 Marks)

c) Calculate the unavailability value of the backup system in two days? (4 Mar
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Question 1
This question carries 30% of the marks for this assignment.
Internet security systems are becoming increasing important since the threats to internet security are becoming ever more sophisticated. Also, more and more businesses are being conducted suing the internet and hence to safeguard the internet resources against malicious attacks is extremely important. Using the internet and other resources (e.g., books and AOU e-library), write a short report explaining the following factors:
Describe a computer virus in the con**** of internet security. Discuss the damage that a computer virus can cause to a computer system. Also discuss the security measures that are commonly implemented to safeguard against computer viruses. (6 marks)
Describe a computer worm in the con**** of internet security. Discuss the damage that a computer worm can cause. (6 marks)
Discuss the term computer hacking. Discuss the ethical issues concerning computer hacking.
(6 marks)
Describe briefly, a firewall in the con**** of internet security. Discuss the Application Layer Firewall and the Network Layer Firewall in your report. (6 marks)
Short Report Writing:
Please adhere to the following guidelines for writing your report:
Your report should be between 500 and 600 words in length. Under-length and over-length reports will be penalized.
(Block 1 – Part 7; Block 2 – Part 7 and Block 3). (2 marks)

Question 2:
This question carries 40% of the marks for this assignment.
WLAN “Wireless local area network” enables devices to communicate with each other without the constraints of connecting cables. Wireless LANs use radio signals as the communication medium instead of wires. WLAN standards are specified by the Institute of Electrical and Electronics Engineers (IEEE) and known as the IEEE 802.11 family of standards for wireless LANs. Using the internet and other resources (e.g., books and AOU e-library), write a report explaining the following factors:
What standards are contained in the IEEE 802.11 wireless family? (6 marks)
Describe briefly, at least three common and frequent attacks made on WLAN networks?
(6 marks)
In the con**** of network security what do we mean by “tunneling”? How it works? Provide your explanation with a diagram. (9 marks)
Explain briefly, at least, three common protocols and methods used to secure WLAN transmissions? (9 marks)
Report Writing:
Please adhere to the following guidelines for writing your report:
Your report should be between 800 and 1000 words in length. Under-length and over-length reports will be penalized.
Your report should include at least two figures and/or tables. Do not forget to include a caption for each figure/table and to use cross-referencing. (3 Marks)
Ensure that your report meets the objectives, has an appropriate structure and style, and that its technical level is appropriate for the audience, purpose and medium. For more details, you can refer to the T215 ****books (Block 1 – Part 7; Block 2 – Part 7 and Block 3). (4 marks)
You must cite all the references i.e. any internet *** site, book, journal, article etc. that you have used as a source of information for your report (3 marks)
You are advised to remind yourself of the issues concerning plagiarism.

Question 3:
This question carries 30% of the marks for this assignment. Answer all of the following parts:
1. WEP is part of the original 802.11 standard for wireless LAN and provides an optional encryption procedure. What is the main aim of WEP? Explain how WEP works and how its encryption scheme works. (8 marks)

2. Suppose a memory card is used that can store 16 GB. What is the smallest compression ratio that a user can set the camera to if he wants to store 4000 photos on the card and the raw photo size is 16 MB? (Assume 1 GB=1000 MB) (6 marks)

3. If eight users are connected to a wireless network that offers a maximum data rate of 200 Mbit/s and a throughput of 40%, what is the typical average practical message data rate available for each user? (8 marks)

4. From your study of GSM mobile telephony system, state four essential features of this digital mobile system? (8 marks)
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End of TMA questions

مع نخبة من أفضل المعيدين والاساتذه والمهندسين المتخصصين
مع نخبة أفضل المعيدين و الاساتذة والمهندسين المتخصصين : حلول مضمونه وغير مكرره

00966544321455 الممتاز في حلول واجبات الجامعة العربية
المفتوحة
(00966544321455 -a_al_shora@************)

2015-2016

Part A: Cryptography (20 marks)
During the study of T215B course you have studied several algorithms of encryption. This part focuses on the basics encryption; use your own words to answer the following questions.
1. Encryption: (6 Marks)
 What is encryption?
 What is it used for?
 What are its advantages and disadvantages?


2. Symmetric key cryptography: (6 Marks)
 What is it?
 What are its applications?
 What are its advantages and disadvantages?

3. Asymmetric key cryptography: (6 Marks)
 What is asymmetric key cryptography and why it is usually called public key cryptography?
 What are its applications?
 What are its advantages and disadvantages?

Note: you need to provide reliable references to your answer

Part B: Two Square Cipher (30 marks)
A two-square cipher [1] is a modification of the Playfair cipher and provides slightly better security of communication by encrypting the plain**** based on digraph principle which you studied in the Cease Cipher with Digraph.
This task aims to assist you in learning more about the two-square cipher. Your answer for this task should be as report which starting with introduction and ending with conclusion, the report should be within 1000 – 1200 words (long report, you should adhere to word count), the report must have proper citations and references. The body of your report should answer the following questions:
1. Define two-square cipher? (6 marks)
2. List the two varieties of the two-square cipher? (2 marks)
3. Describe the two-square encryption steps? (10 marks)
4. Describe the two-square cipher decryption steps? (4 marks)
5. The security of the two-square cipher cryptosystem has several advantages and disadvantages, list two advantages and two disadvantages? (4 marks)
Your answer should be within the range of (1000 – 1200) words count. (2 marks)
You should provide at least one figure or table. (2 marks)

Part C: Two Square Cipher Algorithm - Encryption (30 marks)
This part is a practical one. Based on the previous study of the two square cipher algorithm in Part B, you have to test the algorithm in order to obtain the correct cipher**** by following the next steps.
1. The first step of encryption is preparing the plain****. The plain**** is your first, second and sure names, then select the first 12 letters of the name. (6 marks)
2. Use the two keywords “retreats” and “enemies” to generate two mixed squares one on top of the other of size 5x5, letters of alphabets are arranged line by line starting from the top left corner, the letter ‘x’ is dropped. You should provide the two resultant mixed squares letters as two strings, one each line. (12 marks)
3. Using the Two Square cipher algorithm, encrypt the plain**** of question 1 part C based on the generated two mixed squares of question 2 part C. (12 marks)
Your answer should be detailed, you should show each output of each step of the algorithm besides the final answers.
فلقد تميزنا من بداية انشاء الجامعة العربية المفتوحة منذ عام 2003 بتقديم اروع الأمثله و النماذج في حصول الطلاب على اعلى التقديرات بحول الله تعالى في مختلف تخصصات الجامعة العربية المفتوحة فهناك تخصص ادارة الأعمال الذي يقوم بالإشراف عليه نخبه من دكاترة و حملة الماجستير في تخصص ادارة الاعمال و البيزنس لطلاب الجامعة العربية المفتوحة
وكذلك تخصص تقنية المعلومات و الحاسب و الذي يقوم بالإشراف عليه نخبة من المهندسين والاساتذة والمعيدين المتخصصين
(00966544321455 -a_al_shora@************)
وكذلك تخصصات الإدب و اللغة الانجليزية بقيادة اساتذة الجامعات و الدكاترة في تخصص الإنجلش و اخيرا وليس بأخر نقدم حلول نموذجيه غير متشابهة لقسم التربوي واللغة العربية
شعارنا هو التميز والاستمرارية و بحمد الله فنحن مستمرون من 12 عام في تقديم النموذج الباهر والنجاحات المتعدده ولا يأتي هذا النجاح من فراغ بل من تفوق طلابنا بأعلى الدرجات ولله الحمد
نضمن لكم عدم التكرار ولا التشابه بين الواجبات المختلفة فنحن على يقين بأن نجاح الطالب هو الضمان الوحيد لنجاحنا و استمراريتنا
يمكنكم التواصل عن طريق البريد الالكتروني a_al_shora@************
او عن طريق رقم جوال : 00966544321455 او واتس أب +966544321455
يسعدنا تلقي استفساراتكم وطلباتكم على مدار 24 ساعه يوميا
يمكنكم التواصل عن طريق البريد الالكتروني a_al_shora@************
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وسيتم سرد قائمه بأسماء المواد التي نقوم بتقديم الحلول النموذجية والمنفرده طبقا لنظام التشابه Turnitin الذي يضمن عدم تشابه الواجبات سواء من مصادر الانترنت او من بين واجبات الطلاب و بعضها

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يمكنكم التواصل عن طريق البريد الالكتروني a_al_shora@ hotmail .com
او عن طريق رقم جوال : 00966544321455 او واتس أب +966544321455
لدينا حلول مضمونة 100% بإذن الله وغير مكررة لكافة مواد الجامعة المفتوحة مع إمكانية شرح ومراجعة المواد التي باللغة العربية و يوجد وغيرها كثير وكمان عمل كافة الأبحاث ومراجعات لغوية للرسائل العلمية باللغة العربية للاستشارات المجانية حل واجبات الجامعه العربيه المفتوحه
يمكنكم التواصل عن طريق البريد الالكتروني a_al_shora@ hot mail.com
او عن طريق رقم جوال : 00966544321455 او واتس أب +966544321455