SECTION A
    
1. Explain the various classifications of Computer Networks based on size, topology etc. Compare and contrast the advantages and disadvantages in each classification.
    
2 Explain ISO – OSI, seven layer network architecture giving the functions of each layer.

    
3. What is Routing, Explain Shortest Path Routing algorithm with example?

SECTION B

Case Detail:
Read the case study and answer the accompanied questions.
 Case Study:                                                                                      
Congestion control refers to the techniques and mechanism that can either prevent congestion, before it happens, or remove congestion, after it has happened. In general, we can divide congestion control mechanism into two broad categories: Open loop congestion control (Prevention) and Closed-loop Congestion Control (Removal).
         
   
1. In how many way congestion control techniques can be applied? Explain. 
 

2. In the given TCP network, R1 and R2 are two routers and network 1 and network 2 are the part of this TCP network. The input data rate of router R1 is 7 mb/s and output data rate of same router is 6.53 mb/s. Will there be congestion? If yes then how you will control the congestion in this TCP network?  

Assignment C

Question No: 1
The transmission signal coding method of TI carrier is called
    
Bipolar

NRZ

Manchester

Binary
    
Question No: 2
Which of the following signal is not standard RS-232-C signal?
    
VDR

RTS

CTS

DSR
    
Question No: 3
Which of the following communication modes support two-way traffic but in only one direction at a time?
    
Simplex

Half duplex

Three-quarters duplex

All of the above
    
Question No: 4
What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?
    
4

2

6

3

Question No: 5    
What is max data capacity for optical fiber cable?
    
10 mbps

100 mbps

1000 mbps

10000 mbps
    
Question No: 6
For large networks, which topology is used?
    
Bus

Star

Ring

Mesh
    
Question No: 7
Layer one of the OSI model is--
    
Physical layer

Link layer

Transport layer

Network layer
    
Question No: 8
In which topology, if a computer’s network cable is broken, whole network goes down.
    
Bus

Star

Tree

Mesh
    
Question No: 9
In OSI network architecture, the dialogue control and token management are responsibilities of-    
Session layer

Network layer

Transport layer

Data link layer

Question No: 10
 ISO OSI model is used in--
    
Stand alone PC

Network environment

Sub network access

None of above

Question No: 11
If a computer on the network shares resources for others to use, it is called-- 
    
Server

Client

Mainframe

None of above
    
Question No: 12
ISO stands for--
    
International Standard Organization

International Student Organization

Integrated Services Organization

None of above
    
Question No: 13
Which of the following is used for modulation and demodulation?
    
Modem

Protocol

Gateway

Multiplexer
    
Question No: 14
Which layer decides which physical pathway the data should take?
    
Application

Network

Physical

Data
    
Question No: 15
A standalone program that has been modified to work on a LAN by including concurrency controls such as file and record locking is an example of--
    
LAN intrinsic software

LAN aware software

Groupware

LAN ignorant software
    
Question No: 16
ISDN is an example of which network?
    
Circuit switched

Packet switched

Both of above

None of above
    
Question No: 17
X.25 is an example of which network?
Circuit switched

Packet switched

Both of above

None of above

Question No: 18
The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as--
    
Modulation

Demodulation

Synchronizing

Digitising
    
Question No: 19
What is the max cable length of STP?
    
200 ft

100 ft

100 m

200 m
    
Question No: 20
In which portion of LAN management software restricts access, records user activities and audit data etc?
    
Configuration management

Security management

Performance management

Switch Management
    
Question No: 21
Which connector is used in STP?
    
BNC

RJ-11

RJ-45

RJ-69
    
Question No: 22
Network cable lies on layer--
    
Application

Network

Physical

Data link
    
Question No: 23
What is the central device in star topology?
    
STP server

Hub/switch

PDC

Router

Question No: 24
What is the max data capacity of STP?
    
10 mbps

100 mbps

1000 mbps

10000 mbps

    
    
Question No: 25
Which of the following performs modulation and demodulation?
    
Fibre optics

Satellite

Coaxial cable

Modem    
    
Question No: 26
Which server allows LAN users to share computer programs and data?
    
Communication server

Print server

File server

Mail Server
    
Question No: 27
In OSI network architecture, the routing is performed by—
    
Network layer

Data link layer

Transport layer

Session layer
    
Question No: 28
Which of the following architecture uses CSMA/CD access method?
    
ARC net

Ethernet

Both of above

None of above
    
Question No: 29
Which buffer holds the data before it is sent to the printer through print server?
    
Queue

Spool

Node

None of above
    
Question No: 30
The x.25 standard specifies a-- 
    
Technique for start-stop data

Technique for dial access

Dte/dce interface

Data bit rate

Question No: 31
Which of the following might be used by a company to satisfy its growing communications needs?
Front end processor

Multiplexer

Controller

All of the above
    
Question No: 32
A band is always equivalent to 
    
A byte

A bit

100 bits

None of above

Question No: 33
Which of the following does not allow multiple uses or devices to share one communication line?
    
Double plexer

Multiplexer

Concentrator

Controller    
    
Question No: 34
Communiction circuits that transmit data in both directions but not at the same time are operating in
    
A simplex mode

A half duplex mode

A full duplex mode

An asynchronous mode
    
Question No: 35
How many OSI layers are covered in the X.25 standard?
    
Two

Three

Seven

Six
    
Question No: 36
Which of the following is considered a broad band communication channel?
    
Coaxial cable

Fibre optics cable

Microwave circuits

All of above

Question No: 37
Which of the following is not a transmission medium?
    
Telephone lines

Coaxial cables

Modem

Microwave systems

    
    
Question No: 38
Which of the following is required to communicate between two computers?
    
Communications software

Protocol

Communication hardware

All of above including access to transmission medium
    
Question No: 39
Which of the following is an advantage to using fibre optics data transmission?
    
Resistance to data theft

Fast data transmission rate

Low noise level

All of above

Question No: 40
Electronic systems that transmit data over communications lines from one location to another are called ________.
    
transmission systems

communications systems

microcomputer systems

LAN transmission systems

41. The interactive transmission of data within a time sharing system may be best suited to-- 
Simplex lines
Half-duplex lines
Full duplex lines
Biflex-lines