School of Computer, Data and Mathematical Sciences
300095 Computer Networks and Internets Sydney City Session 1 2021
Unit Details
Unit Code:
300095
Unit Name:
Computer Networks and Internets
Credit Points:
10
Unit Level:
3
Assumed Knowledge:
Fundamentals of data communications and computer networking, such as that covered in the prerequisite unit.
Note: Students with any problems, concerns or doubts should discuss those with the Unit Coordinator as early as they can.
Unit Convenor (SCC)
Name: Dr Mohammad Momani
Email: m.momani@city.westernsydney.edu.au
Consultation Arrangement:
Please liaise directly with the academic teaching this unit regarding appropriate consultation times. It is usually best to make contact with these staff via email.
Program Convenor (SCC)
Name: Antoinette Cevenini
Email: a.cevenini@city.westernsydney.edu.au
Consultation Arrangement:
Please liaise directly with the academic teaching this unit regarding appropriate consultation times. It is usually best to make contact with these staff via email.
Edition: Sydney City Session 1 2021
Copyright ©2021 University Western Sydney trading as Western Sydney University ABN 53 014 069 881 CRICOS Provider No: 00917K No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without the prior written permission from the Dean of the School. Copyright for acknowledged materials reproduced herein is retained by the copyright holder. All readings in this publication are copied under licence in accordance with Part VB of the Copyright Act 1968.
Contents
1 About Computer Networks and Internets 2
1.1 AnIntroductiontothisUnit ………………………………… 2 1.2 WhatisExpectedofYou ………………………………….. 2 1.3 ChangestoUnitasaResultofPastStudentFeedback ……………………. 3
2 Assessment Information 4
2.1 UnitLearningOutcomes ………………………………….. 4
2.2 ApproachtoLearning ……………………………………. 4
2.3 ContributiontoCourseLearningOutcomes …………………………. 5
2.4 AssessmentSummary ……………………………………. 6
2.5 AssessmentDetails …………………………………….. 7
2.5.1 PracticalExercises………………………………….. 7 2.5.2 SkillsBasedPracticalTest ……………………………… 8 2.5.3 Intra-sessionexam-OnlineTest …………………………… 9 2.5.4 FinalExam …………………………………….. 10
2.6 GeneralSubmissionRequirements………………………………. 11
3 Teaching and Learning Activities 13
4 Learning Resources 15
4.1 RecommendedReadings…………………………………… 15
Note: The relevant Learning Guide Companion supplements this document 1
1 About Computer Networks and Internets 1.1 An Introduction to this Unit
This unit extends on the work undertaken in the prerequisite unit and provides students with an in-depth explanation on the role of the architecture, components, and operations of routers and switches in a small network. Students will configure and troubleshoot routers and switches and resolve common issues with common routing protocols, virtual LANs, and inter-VLAN routing in both IPv4 and IPv6 networks. This is the second of three units that prepares the student for industry-based networking certification (CCNA).
1.2 What is Expected of You
Study Load
A student is expected to study an hour per credit point a week. For example a 10 credit point Unit would require 10 hours of study per week. This time includes the time spent within classes during lectures, tutorials or practicals.
Attendance
Attendance in lectures is not compulsory, though highly recommended. Attendance in student scheduled lab workshops is mandatory.
Online Learning Requirements
Unit materials will be made available on the Unit’s vUWS (E-Learning) site (https://vuws.westernsydney.edu.au/). You are expected to consult vUWS at least twice a week, as all Unit announcements will be made via vUWS. Teaching and learning materials will be regularly updated and posted online by the teaching team.
Special Requirements
Essential Equipment:
Not Applicable
Legislative Pre-Requisites:
Not Applicable
Policies Related to Teaching and Learning
The University has a number of policies that relate to teaching and learning. Important policies affecting students include:
– Assessment Policy
– Bullying Prevention Policy and
– Guidelines
– Enrolment Policy
– Examinations Policy
– Review of Grade Policy
– Sexual Harassment Prevention Policy
– Special Consideration Policy
– Student Misconduct Rule
– Teaching and Learning – Fundamental Code – Student Code of Conduct
2
Academic Integrity and Student Misconduct Rule
In submitting assessments, it is essential that you are familiar with the policies listed above and that you understand the principles of academic integrity. You are expected to act honestly and ethically in the production of all academic work and assessment tasks, submit work that is your own and acknowledge any contribution to your work made by others.
Important information about academic integrity, including advice to students is available at https://www.westernsydney. edu.au/studysmart/home/academic_integrity_and_plagiarism. It is your responsibility to familiarise yourself with these principles and apply them to all work submitted to the University as your own.
When you submit an assignment or product, you will declare that no part has been: copied from any other stu- dent’s work or from any other source except where due acknowledgement is made in the assignment; submitted by you in another (previous or current) assessment, except where appropriately referenced, and with prior permission from the Unit Coordinator; written/produced for you by any other person except where collaboration has been au- thorised by the Unit Coordinator.
The Student Misconduct Rule applies to all students of Western Sydney University and makes it an offence for any student to engage in academic, research or general misconduct as defined in the Rule.
The University considers plagiarism, cheating and collusion as instances of academic misconduct. The University also considers submitting falsified documentation in support of applications for special consideration, including sitting of deferred examinations, as instances of general misconduct. You should be aware that changes were made to the Student Misconduct Rule commencing 1 January 2020 that provide for minimum sanctions that apply to certain conduct, including the provision of falsified documentation to the University.
You are strongly advised to read the Student Misconduct Rule and the Inappropriate Behaviour Guidelines at the commencement of each session to familiarise yourself with this process and the expectations of the University in relation to work submitted for assessment.
1.3 Changes to Unit as a Result of Past Student Feedback
The University values student feedback in order to improve the quality of its educational programs. The feedback provided helps us improve teaching methods and Units of study. The survey results inform Unit content and design, learning guides, teaching methods, assessment processes and teaching materials.
You are welcome to provide feedback that is related to the teaching of this Unit. At the end of the semester you will be given the opportunity to complete a Student Feedback on Unit (SFU) questionnaire to assess the Unit. You may also have the opportunity to complete a Student Feedback on Teaching (SFT) questionnaire to provide feedback for individual teaching staff.
As a result of student feedback, the following changes and improvements to this subject have recently been made:
– Increased practical component
– Hands on experience with real networking equipment – Increased industry relevance
– Exclusion of assessable online weekly quizzes
3
2 Assessment Information 2.1 Unit Learning Outcomes
This unit extends on the work undertaken in the prerequisite unit and provides students with an in-depth understanding of the role of TCP/IP, ICMP and routing protocols used in IP networks and internetworks. Students will learn about the critical role of routing protocols and how to design, construct and implement small internets. Students will also learn how to perform basic management and security tasks in a practical, hands-on fashion using Cisco routers and other networking equipment. This is the second of three units that prepares the student for industry based networking certification (CCNA).
Outcome
1
Describe and explain basic switching concepts and the operation of switches
2
Investigate and describe the purpose, nature, and operations of a router, routing tables, and the route lookup process
3
Design a network addressing scheme using both classful and classless addressing
4
Define, configure, and troubleshoot how VLANs create logically separate networks and how routing occurs between them
5
Configure and manage routers used in small internets
6
Configure and troubleshoot static routing and default routing
7
Configure and troubleshoot dynamic routing
8
Define, configure, and troubleshoot access control lists (ACLs)
9
Configure and troubleshoot Dynamic Host Configuration Protocol (DHCP)
10
Explain, configure, and troubleshoot Network Address Translation (NAT) operations
2.2 Approach to Learning
In general the credit point value of a unit determines the number of hours per week you need to spend on a unit in order to pass the unit. The weekly scheduled class activities in this unit are in total four (4) hours (2-hour lecture and 2-hour practical lab workshop) per week. This means that, provided you work efficiently in the scheduled teaching/learning time, you will need to spend a minimum of an additional six (6) hours per week working on the material for this unit, including reading the online curriculum, preparation for the practical lab workshop exercises, completing online quizzes and studying for the final exam. In this unit you will be engaged in a range of activities to support your learning. There are a range of resources available to assist you in this unit and university study more generally. The key activities and resources for this unit are outlined in section 3 of this learning guide.
Essential Equipment:
Due to fully online delivery, you are required to have:
– a computer with working camera and microphone;
– a stable internet connection;
– a quiet learning space; and
– the latest version of Packet Tracer installed on your computer
4
5
2.3 Contribution to Course Learning Outcomes
Key: (I)ntroduced (D)eveloped (A)ssured
3639: Bachelor of Information and Communications Technology
Program Learning Outcomes
1 2 D D
3 4 D D
5 D
6 D
7 D
8 D
9 10 D D
1. Explain the complex networks involved when dealing with people, business and government in the context of ICT development, support and service provision.
2. Evaluate the technological and software core of ICT theory and practice analysing and designing applications 3. Apply the knowledge and skills required for the development of new applications and new application areas
D I I
D I I
D D I I I I
4. Innovate by keeping up to date with the rapid development in technology and practice across the ICT domain, as an extension of their current understandings and the ability to find innovative ICT solutions and move the ICT field forward.
5. Perform work of high quality with an awareness of the professional code of conduct, professional and personal ethics, and the legal and social implications of technological change relating to privacy of information and professional practice.
I I
I
2.4 Assessment Summary
The assessment items in this Unit are designed to enable you to demonstrate that you have achieved the Unit learning outcomes. Completion and submission of all assessment items which have been designated as mandatory or compulsory is essential to receive a passing grade.
To pass this Unit you must:
Attempt all assessment items AND achieve a passing mark in the final online test (quiz) AND attain a total unit mark of 50 or greater. Students not meeting this minimum mark may have demonstrated good practical skills but would not have demonstrated the required conceptual and theoretical understanding required of someone studying at a university level.
Item
Weight
Due Date
ULOs Assessed
Threshold
Practical Exercises
10%
In your scheduled lab workshop session in week 5, week 10 and week 12 (See schedule of Teaching and Learning Activities for more details)
4 – 10
No
Skills Based Practical Test
20%
In your scheduled lab workshop session in week 12 (See schedule of Teaching and Learning Activities for more details)
4 – 10
No
Intra-session exam – Online Test
20%
In your scheduled lab workshop session in Week 13 (See schedule of Teaching and Learning Activities for more details)
1 – 10
Yes
Final Exam
50%
Formal Examination Period
1-4
No
Feedback on Assessment
Feedback is an important part of the learning process that can improve your progress towards achieving the learning outcomes. Feedback is any written or spoken response made in relation to academic work such as an assessment task, a performance or product. It can be given to you by a teacher, an external assessor or student peer, and may be given individually or to a group of students. As a Western Sydney University student, it is your responsibility to seek out and act on feedback that is provided to you as a resource to further your learning.
In this unit you can expect feedback on your assessment items within 2 weeks of submission and interactively during your lab workshop sessions.
6
2.5 Assessment Details 2.5.1 Practical Exercises
Weight:
10%
Type of Collaboration:
Individual
Due:
In your scheduled lab workshop session in week 5, week 10 and week 12 (See schedule of Teaching and Learning Activities for more details)
Submission:
In class
Format:
Lab sheets
Length:
2 hours per week
Curriculum Mode:
Practical
Practical exercises will be conducted in the weekly 2-hour lab workshops. There will be up to a maximum of 12 practical exercises that are designed to provide the student the opportunity to grow their conceptual/theoretical understanding of the unit content in a hands-on way whilst at the same time developing the practical skills required to construct and configure simple LANs. Students will be assessed individually on their ability to meet the objectives of each of the lab exercises.
In each of the practical exercises students meeting 80% or more of the objectives will receive 10 marks; students obtaining between 50% and 80% will receive 5 marks and students not achieving at least 50% of the objectives will receive a 0 mark. The mark achieved in the lab exercises is designed to indicate to the student the level of conceptual knowledge and practical ability they have attained. 10 marks indicates that the student has good con- ceptual/theoretical knowledge and practical skills in the examined area whilst students who only have an adequate level of knowledge and practical skills will achieve 5 marks (see criteria and below).
Resources:
– Online materials (vUWS and Cisco NetAcad site)
– Lab handouts can be found in the vUWS site for the unit and in the Cisco NetAcad
– Networking equipment in the networking labs during you scheduled Lab Workshop time (if applicable) – Packet Tracer Labs and Activities
Marking Criteria:
Lab Exercise Criteria
Marks:
Criteria:
0
Student has not met at least 50% of the lab objectives
5
Student has met 50% – 80% of the lab objectives
10
Student has met more than 80% of the lab objectives
7
2.5.2 Skills Based Practical Test
Weight:
20%
Type of Collaboration:
Individual
Due:
In your scheduled lab workshop session in week 12 (See schedule of Teaching and Learning Activities for more details)
Submission:
In lab workshop session
Format:
Skills based practical test (45 mins – 60 mins max).
Length:
45 minutes
Curriculum Mode:
Practical
The Skills Based Practical Test (SBPT) is similar in format to the practical lab exercises except that they are con- ducted in an examination environment. The test is broken up into a series of objectives/parts with each objective/part consisting of a series of associated tasks or configuration items. Each of the tasks and/or configuration item/s will be assigned a given number of points related to the complexity of the task or configuration item/s. The points are awarded to the students if the task or configuration item/s are completed correctly. The final mark for the test is simply the aggregate of all the points awarded.
Resources:
Lab journal books are permitted only. These will be checked prior to the conduct of the assessment by the unit convenor.
Marking Criteria:
Skills Based Practical Test Criteria
Points:
Criteria:
0% of points value
Student does not perform task or configuration item correctly
100% of points value
Student performs task or configuration item correctly
8
2.5.3 Intra-session exam – Online Test
Weight:
20%
Type of Collaboration:
Individual
Due:
In your scheduled lab workshop session in Week 13 (See schedule of Teaching and Learning Activities for more details)
Submission:
Online in lab workshop session
Format:
Online quiz – multiple choice questions with single and/or multiple answers
Length:
1 hour
Curriculum Mode:
Intra-session Exam
Threshold Detail:
Students MUST achieve a passing mark for this assessment. Students not meeting the passing mark may have demonstrated good practical skills but would not have demonstrated the required conceptual and theoretical understanding required of someone studying at a university level.
The Final Online Quiz is a supervised in class one (1) hour in duration test with no additional resources allowed. The test consists of multiple choice questions comprised of single and multiple answers type questions covering all the Cisco materials presented throughout the session and in the online material. The Final Online Quiz will be held in your lab workshop session in week 13 (see weekly schedule for details).
In order to prepare for the final online quiz students will be given the opportunity to do chapter quizzes and exams. These online chapter quizzes and exams will become available in week 1. Once started the student will have 1 hour to complete each online quiz/exam. The online quizzes will cover the topics presented in the online curriculum material and/or in classes. The online quizzes consist of multiple choice questions comprised of single and multiple answers type questions. The quizzes will be available online on the Cisco Networking Academy ( http://www.netacad.com).
Resources:
Closed book. No additional resources allowed for this assessment.
Marking Criteria:
Multiple Choice Criteria
∗Note some questions may require multiple choice answers. Therefore, students will attain partial marks to the question based on the correct choices selected.
Marks:
Criteria:
0%
Student selects inappropriate choice
100%
Student selects appropriate choice
9
2.5.4 Final Exam
Weight:
50%
Type of Collaboration:
Individual
Due:
Formal Examination Period
Submission:
Formal Examination Period
Format:
2 Hour Closed Book.
Length:
2 hours
Curriculum Mode:
Final Exam
The final examination will be conducted online and will be held during the exam period at the end of the session. The exam will be a 2-hour exam consisting of short answer questions and it may cover any topic/s covered in this unit.
Revision and Final Exam information and preparation will be provided in the final lecture in week 13.
Resources:
Closed book. No additional resources allowed in the exam.
Marking Criteria:
Final Examination for short answer standards:
% of marks available:
Criteria:
0%
Student provides an inappropriate or null answer
25%
Student demonstrates minimal understanding of the problem. Many requirements of the question are absent from the response
50%
Student demonstrates partial understanding of the problem. Many requirements of the question are present in the response
75%
Student demonstrates considerable understanding of the problem. Many requirements of the question are present in the response
100%
Student demonstrates complete understanding of the problem. All requirements of the question are present in the response
10
2.6 General Submission Requirements Submission
– All assignments must be submitted by the specified due date and time.
– Complete your assignment and follow the individual assessment item instructions on how to submit. You must
keep a copy of all assignments submitted for marking.
Turnitin
– The Turnitin plagiarism prevention system may be used within this Unit. Turnitin is accessed via logging into vUWS for the Unit. If Turnitin is being used with this Unit, this means that your assignments have to be submitted through the Turnitin system. Turnitin from iParadigms is a web-based text-matching software that identifies and reports on similarities between documents. It is also widely utilised as a tool to improve academic writing skills. Turnitin compares electronically submitted papers against the following:
– Current and archived web: Turnitin currently contains over 24 billion web pages including archived pages
– Student papers: including Western Sydney University student submissions since 2007
– Scholarly literature: Turnitin has partnered with leading content publishers, including library databases, text-book publishers, digital reference collections and subscription-based publications (e.g. Gale, Pro- quest, Emerald and Sage)
– Turnitin is used by over 30 universities in Australia and is increasingly seen as an industry standard. It is an important tool to assist students with their academic writing by promoting awareness of plagiarism.By submitting your assignment to Turnitin you will be certifying that:
– I hold a copy of this assignment if the original is lost or damaged
– No part of this assignment has been copied from any other student’s work or from any other source except
where due acknowledgement is made in the assignment
– No part of the assignment has been written for me by any other person/s
– I have complied with the specified word length for this assignment
– I am aware that this work may be reproduced and submitted to plagiarism detection software programs for the purpose of detecting possible plagiarism (which may retain a copy on its database for future plagiarism checking).
Self-Plagiarising
– You are to ensure that no part of any submitted assignment for this Unit or product has been submitted by yourself in another (previous or current) assessment from any Unit, except where appropriately referenced, and with prior permission from the Lecturer/Tutor/Unit Coordinator of this Unit.
Late Submission
– If you submit a late assessment, without receiving approval for an extension of time, (see next item), you will be penalised by 10% per day for up to 10 days. In other words, marks equal to 10% of the assignment’s weight will be deducted from the mark awarded.
– For example, if the highest mark possible is 50, 5 marks will be deducted from your awarded mark for each late day.
– Saturday and Sunday are counted as one calendar day each.
– Assessments will not be accepted after the marked assessment task has been returned to students.
– This is consistent with Western Sydney University’s Assessment Policy
11
Extension of Due Date for Submission
Extensions are only granted in exceptional circumstances. To apply for an extension of time, locate an application form via the Western Sydney University homepage or copy the following link: https://www.westernsydney.edu.au/currentstudents/current_students/forms
Application forms must be submitted to the Unit Coordinator/Convenor. Requests for extension should be made as early as possible and submitted within policy deadlines. Appropriate, supporting documentation must be submitted with the application. An application for an extension does not automatically mean that an extension will be granted. Assessments will not be accepted after the marked assessment task has been returned to students.
Resubmission
Resubmission of assessment items will not normally be granted if requested.
Application for Special Consideration
It is strongly recommended that you attend all scheduled learning activities to support your learning. If you have suffered misadventure, illness, or you have experienced exceptional circumstances that have prevented your attendance at class or your completion and submission of assessment tasks, you may need to apply for Special Consideration via the Western Sydney University website. http://www.westernsydney.edu.au/currentstudents/current_students/services_ and_facilities/special_consideration2 or the Student Centre/Sydney City Campus Reception. Special Consideration is not automatically granted. It is your responsibility to ensure that any missed content has been covered. Your lecturer will give you more information on how this must be done.
12
13
3 Teaching and Learning Activities
Weeks
Topic
Lecture
Independent
Prac/Lab
Assessments Due
Week 1 08-03-2021
Introduction/Welcome to the subject – Switching , Routing and Wireless Essentials
Basic Device Configuration
Read module 1 from the online curriculum. Attempt Packet Tracer activities.
Lab 1
Week 2 15-03-2021
Switching Concepts & VLANs & Inter-VLAN Routing
Switching Concepts
Read module 2 from the online curriculum. Attempt Packet tracer activities
Lab 2
Week 3 22-03-2021
Switching Concepts & VLANs & Inter-VLAN Routing
VLANs & Inter-VLAN Routing
Read modules 3 & 4 from the online curriculum. Attempt Packet tracer activities.
Lab 3
Week 4 29-03-2021
Redundant Networks
STP Concepts & EtherChannel
Read modules 5 & 6 from the online curriculum. Attempt module 5 – 6 exam & PacketTracer activities.
Lab 4
Week 5 05-04-2021
Available and Reliable Networks
DHCPv4
Read module 7 from the online curriculum. Attempt Packet Tracer activities.
Lab 5 Practical Exercises (Labs 1,2,3, & 4) due.
– Practical Exercises
Week 6 12-04-2021
Available and Reliable Networks
SLAAC and DHCPv6
Read module 8 from the online curriculum. Attempt Packet Tracer activities.
Lab 6
Note: Public Holidays may affect classes this week. More information will be provided on vUWS.
Note: Public Holidays may affect classes this week. More information will be provided on vUWS.
14
Weeks
Topic
Lecture
Independent
Prac/Lab
Assessments Due
Week 7 19-04-2021
Available and Reliable Networks
FHRP Concepts
Read module 9 from the online curriculum. Attempt module 7 – 9 Exam and Packet Tracer activities.
Lab 7
Week 8 26-04-2021
L2 Security and WLANs
Switch Security Configuration
Read modules 10 & 11 from Read modules 10 & 11 from the online curriculum. Attempt packet tracer activities.
Lab 8
Week 9 03-05-2021
L2 Security and WLANs
WLAN Concepts & WLAN Configuration
Read modules 12 & 13 from the online curriculum. Attempt packet tracer activities.
Lab 9
Week 10 10-05-2021
Routing Concepts & Configuration
Routing Concepts & IP Static Routing
Read modules 14 & 15 from the online curriculum. Attempt packet tracer activities.
Lab 10 Practical Exercises (Labs 5, 6, 7 & 8) due.
– Practical Exercises
Week 11 17-05-2021
Routing Concepts & Configuration
Troubleshoot Static and Default Routes
Read module 16 from the online curriculum. Attempt packet tracer activities
Practice for the Skills Based Practical Test.
Week 12 24-05-2021
Skills Based Practical Test Review
Revision
Practice Online Final Quiz from NetAcad
Skills Based Practical Test. Practical Exercises (Labs 9 & 10) due.
– Practical Exercises
– Skills Based Practical Test
Week 13 31-05-2021
Revision
Revision and Final Exam information
Revision
Final Online Quiz
– Intra-session exam – Online Test
Week 14 07-06-2021
Final Examination Period
– Final Exam
The above timetable should be used as a guide only, as it is subject to change. Students will be advised of any changes as they become known on the Unit’s vUWS site.
4 Learning Resources
4.1 Recommended Readings Additional Reading
Cisco Networking Academy Program (Ed.). (2014). Routing and switching essentials companion guide. Indianapolis, IN: Cisco Press.
Cisco Networking Academy Program (Ed.). (2014). Switched Networks Companion Guide. Indianapolis, IN: Cisco Press.
Comer, D. (2014). Internetworking with TCP/IP (6th ed.). Upper Saddle River, New Jersey: Pearson Education Inc.,.
da Silva, M. M. (2012). Multimedia Communications and Networking. Hoboken: Taylor and Francis.
FitzGerald, J., Dennis, A., & Durcikova, A. (2015). Business data communications and networking (12th ed.). Hoboken, NJ: Wiley.
Forouzan, B. A. (2010). TCP/IP protocol suite. Boston: McGraw-Hill Higher Education.
Forouzan, B. A. (2013). Data communications and networking (5th ed.). New York, N.Y.: McGraw-Hill.
Graziani, R., & Johnson, A. (2008). Routing protocols and concepts: CCNA exploration companion guide. Indi- anapolis, Ind: Cisco Press.
ITL Education Solutions Limited (Ed.). (2012). Express Learning: Data Communications and Computer Networks. New Delhi, India: Pearson Education.
Khan, S., & Mauri, J. L. (Eds.). (2014). Green networking and communications : ICT for sustainability. Boca Raton: CRC Press.
Kurose, J. F., & Ross, K. W. (2013). Computer networking: a top-down approach. Boston: Pearson.
Solomon, M., & Kim, D. (2013). Fundamentals of communications and networking. Burlington, MA: Jones & Bartlett Learning.
Stallings, W. (2013). Data and computer communications (10th ed.). Boston: Pearson.
Stallings, W., & Case, T. (2013). Business data communications : infrastructure, networking and security (7th ed.). Boston: Pearson.
Stamper, D. A., & Case, T. (2003). Business data communications. Upper Saddle River, NJ: Prentice Hall. Tanenbaum, A. S., & Wetherall, D. (2011). Computer networks. Boston: Pearson Prentice Hall.
15