Computer Communication and Network BS 5 Semester/Term University Of Sargodha (UOS) 2015

University of Sargodha

BS(CS) 5* Term Exam 2015

Paper: Computer Communication and Networks (CMP330)

Time Allowed: 2:30 Hours

Session: 2013-2017

Maximum Marks: 80

Objective Part (Compulsory)

Q.No.1:

Attempt all parts and each require answer 2 - 3 lines

(16*2=32)

What is SNR and how it important?

•

ii. Differentiate between TCP and UDP.

ili. What function does a modem perform?

iv. What is flow control and which layer is responsible for this?

v. What is routing?

vi. What is encryption?

vii. Define topology, list down the names of common topologies.

vili.

What are the different modes of optical fiber?

ix. Why CRC is used in data communication?

X. What is attenuation?

xi. How twists in per unit length reduce the noise in twisted pair cable?

xii.

Differentiate between TDM and FDM.

xiii.

What is PPP?

xiv.

What is DSL?

xv. Define protocol with example.

xvi. What is baud rate?

Subjective Part

(4*12=48)

Note: Attempt four out of six questions.

O.No.2-

-Describe the OSI model, write a paragraph describing the areas of function

that each layer is responsible for.

Q.No.3

Describe the physical construction characteristics of the following

transmission media.

• coaxial cable

• optical fiber

Q.No.4

Q.No.5

Describe network security issues in detail.

Briefly explain various phases involved in communication via virtual circuit

switching. Compare it with packet switching.

Q.No.6

Describe LAN topologies along with pros and cons of each topology.

Q.No.7

Define Encoding and explain three digital encoding schemes and apply them

on the string, 1100111.

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