University: AMITY Year: 2015
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?
4. When a network performs poorly, its users often complain to the administrators running it and demanding improvements. To improve the performance, the operators must first determine exactly what is going on? To find out what is really happening, the operators must make some measurements. What are these measurements?
5. What is the difference between asynchronous and synchronous transmission?
6. a) Explain Ethernet MAC sub layer protocol with frame formats and also analyze its performance.
b) Given an IP address 192.168.0.5
7. i) What is the binary equivalent of second octet?
ii) What is the class of this address?
iii) What is the network address of the given IP address?
8With the help of neat sequence diagrams, explain--
(i) Stop and wait protocol
(ii) Go - back - N ARQ sliding window protocol.
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?
100 ft
200 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
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