3438

Final: 27-9-2018
ALLAMA IQBAL OPEN UNIVERSITY, ISLAMABAD

(Department of Computer Science)
WARNING
1. PLAGIARISM OR HIRING OF GHOST WRITER(S) FOR SOLVING
THE ASSIGNMENT(S) WILL DEBAR THE STUDENT FROM AWARD
OF DEGREE/CERTIFICATE, IF FOUND AT ANY STAGE.
2. SUBMITTING ASSIGNMENT(S) BORROWED OR STOLEN FROM
OTHER(S) AS ONE’S OWN WILL BE PENALIZED AS DEFINED IN
“AIOU PLAGIARISM POLICY”.
Course: Computer Communications & Networks (3438) Semester: Autumn 2018

Level: Bachelor Total Marks: 100
ASSIGNMENT No. 1
Note: All questions are compulsory & carry equal marks.
Q. 1 Describe briefly the types of models used for communication model and different
communication task. (20)
Q. 2 (a) Describe the OSI seven-layer model. Name each of the layers in the model and
draw a diagram that shows the ordering of these layers. Write a paragraph
describing the areas of function that each layer is responsible for.
(b) Contrast the OSI model you have just described with the TCP/IP reference
model. Using a diagram show the correspondence between relevant protocol
layers in the two models.
(c) Discuss the relative merits of each of these models in the context of modern
computer networking. (20)
Q. 3 Define signal. Differentiate time domain and frequency domain. What is the
difference between guided and unguided transmission media? (20)
Q. 4 Write short notes on each of the following: (20)

 Attenuation
 Delay distortion
 Coaxial Cable
 Optical Fiber
Q. 5 Differentiate digital data and digital signal. Also explain terrestrial & satellite
microwave in detail. (20)
ASSIGNMENT No. 2
Total Marks: 100
Note: All questions are compulsory & carry equal marks.

Q. 1 Define network topology. Explain different types of topologies in detail with
examples. (20)
Q. 2 Differentiate asynchronous and synchronous transmission in detail. Also explain

different types of multiplexing. (20)
Q. 3 Explain different flow control techniques. Also define error detection and error
control techniques. (20)
Q. 4 (a) Describe in detail the Carrier Sense Multiple Access/Collision Detection

(CSMA/CD) process.
(b) Explain why Wi-Fi uses Carrier Sense Multiple Access/Collision Avoidance
(CSMA/CA) rather than CSMA/CD. Be specific. (20)
Q. 5 Write short notes on the following with respect to their functionality: (20)
 Switch
 Router
 Bridge
 Proxy Server
3438 Computer Communications & Networks

Course Code: 3438
Course Title: Computer Communications & Networks
Credit Hours: 4 (3 + 1), 3 hours lecture and 3 hours lab per week
Session Offered: As per offering schedule
Recommended Book: Data Communications and Networking by Behrouz A
Forouzan, 5th Edition, 2013
A/V / Multimedia Content: As defined by the Instructor / MOOCs links
Reference Book: 1. Data and Computer Communication by William
Stallings eighth edition, 2007.
2. Computer Networks by A. S. Tanenbaum, D. J.
Wetherall, 5th Edition Prentice Hall 2010.
Pre-Requisite: N/A
Course Coordinator: Ch. Muhammad Shahbaz Anjum
Teaching Methodology: Face-to-Face/Online/Blended
Computer Usage: 3 hours supervised lab per week + about 3 hours
unsupervised lab
Course Introduction:
2
This course covers the basics of data communication and networking. The course covers
the major areas of transmission, OSI model, TCP/IP, UDP and security issues in
networking.
Course Objectives:
At the end of the course the students are expected to:
1. Become familiar with the basics of computer communication.
2. Understand analogue and digital transmission in communication.
3. Elaborate the functionality of OSI layers and TCP/IP protocols.
4. Understand the modern network concepts.
Evaluation Criteria:
i. Assignments and/or quizzes as per instructor’s choice 10%
ii. Midterm theory/practical/ presentation/ mini projects as per instructor’s choice 20%
iii. Final Examination 70%
Course Outline:
Unit# 1 Introduction
Data Communications, Networks, The Internet, Protocols and Standards
Unit# 2 Layered Protocols, Networks and OSI Models

Layered Tasks, The OSI Model, Layers in The OSI Model, TCP/IP Protocol Suite,
Addressing
Unit# 3 Fundamentals of Signals, Digital & Analog Transmission

Analog and Digital, Periodic Analog Signals, Digital Signals, Transmission
Impairment, Data Rate Limits, Performance, Digital-to-Digital Conversion,
Analog-to-Digital Conversion, Transmission Modes, Digital-to- Analog
Conversion, Analog-to-Analog Conversion
Unit# 4 Data Communication Interface and Multiplexing

Multiplexing, Spread Spectrum, Guided media, Unguided Media: Wireless,
Circuit-Switched Networks, Datagram Networks, Virtual-Circuit Networks,
Structure of a Switch.
Unit# 5 Error Management and Data Link Control

Introduction, block coding, linear block codes, cycle codes, checksum, Framing,
flow and error control, protocols, noiseless channels, noisy channels, HDLC, point-
to-point protocol
Unit# 6 Multiple Access and LAN Technologies

Random access, controlled access, channelization, IEEE standards, standard
Ethernet, fast Ethernet, gigabit Ethernet, IEEE 802.11, Bluetooth
Unit# 7 Logical Addressing and Internet Protocol
3
IPv4 Addresses, IPv6 Addresses, Internetworking, IPv4, IPv6, Transition from IPv4
to IPv6
Unit# 8 Mapping, Error Reporting, Multicasting Routing and UDP

Address mapping, ICMP, IDMP, ICMPv6, Delivery, Forwarding, Unicast Routing
Protocols, Multicast Routing Protocol, User Datagram Protocol (UDP)
Unit# 9 UDP, TCP and Internet Security Issues

Introduction to TCP, WWW Architecture, Web Documents, HTTP, Simple Network
Management Protocol (SNMP), Security Overview, Symmetric-Key Cryptography,
Asymmetric-Key Cryptography, Network Security Services, Message
Confidentiality, Message Integrity, Message Authentication, Digital Signature,
Entity Authentication, Key Management
Activities/Practical:
1. The institution should make arrangements for the demonstration of:
a. Various media devices and communication services.
b. Data Communication model.
c. Failure of data Communication system.
d. Implementation of various protocols.
2. Implementation of various type of security for data transmission must be practiced.
The institution should arrange the following to make and test UTP cable from the
students used in Star topology (a) Direct Cable and (b) Cross over Cable.
Note: The instructor may assign additional activities.
Last revised: June 2015
____[ ]____
AIOU–AS-508(18)/PPU–27-9-2018–200.

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What are the main topics covered in the course?

What are the main topics covered in the course?

What are the evaluation criteria for the course?

What are the evaluation criteria for the course?

Final: 27-9-2018

ALLAMA IQBAL OPEN UNIVERSITY, ISLAMABAD

Course: Computer Communications & Networks (3438) Semester: Autumn 2018

Q. 4 Write short notes on each of the following: (20)

Note: All questions are compulsory & carry equal marks.

Q. 2 Differentiate asynchronous and synchronous transmission in detail. Also explain

Q. 4 (a) Describe in detail the Carrier Sense Multiple Access/Collision Detection

3438 Computer Communications & Networks

Unit# 2 Layered Protocols, Networks and OSI Models

Unit# 3 Fundamentals of Signals, Digital & Analog Transmission

Unit# 4 Data Communication Interface and Multiplexing

Unit# 5 Error Management and Data Link Control

Unit# 6 Multiple Access and LAN Technologies

Unit# 7 Logical Addressing and Internet Protocol

Unit# 8 Mapping, Error Reporting, Multicasting Routing and UDP

Unit# 9 UDP, TCP and Internet Security Issues

Note: The instructor may assign additional activities.

Last revised: June 2015

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