QNo. 5 SQL
2014 Q.Paper
(a) Explain the concept of Union between two tables, with the help of appropriate example.
Note:
Answer the questions (b) and (c) on the basis of the following tables STORE and ITEM
Table: STORE
SNo
SName
Area
S01
ABC Computronics
GK II
S01
S02
ALL Infotech Media
Tech Shoppe
CP
Nehru Place
S04
Geeks Tecno Soft
Nehru Place
S05
Hitech Tech Store
CP
Table: ITEM
INo
IName
Price
SNo
T01
T02
Mother Board
Hard Disk
12000
5000
S01
S01
T03
Keyboard
500
S02
T04
Mouse
300
S01
T05
Mother Board
400
S03
T06
T07
Key Board
LCD
400
6000
S03
S04
T08
LCD
5500
S05
T09
Mouse
350
S05
T10
Hard Disk
4500
S03
(c) Write the output of the following SQL commands (1 to 4):
1) SELECT DISTINCT INAME FROM ITEM WHERE PRICE>=5000;
2) SELECT AREA, COUNT(*) FROM STORE GROUP BY AREA;
3) SELECT COUNT(DISTINCT AREA) FROM STORE;
4) SELECT INAME, PRICE*0.05 DISCOUNT FROM ITEM WHERE SNO IN
(‘S02’,’S03’);
[2+1+1+1+1+2=8]
(b) Write the SQL queries(1 to 4)
1) To display IName and Price of all the Items in ascending order of their price.
2) To display SNo and SName of all Stores located in CP.
3) To display Minimum and Maximum Price of each IName from the table Item.
4) To display IName, Price of all items and their respective SName where they are
available.
ANSWERS
(a) The UNION query of SQL combines row results from one table with rows of another table (vertically). Both
the tables should contain same number of fields and same types of fields.
Example-
SELECT * FROM Emp1
UNION
SELECT * FROM Emp2;
(b)
(i) Select IName, Price
From Item
Order By Price Asc;
(ii) Select SNo, SName
From Store
Where Area=”CP”;
(iii) Select IName, Max(Price), Min(Price)
From Item
GROUP BY Iname;
(iv) SelectIName, Price
From Store, Item
Where Store.SNo=Item.INo;
(c)
(i)
IName
Hard Disk
LCD
Mother Board
(ii)
Area
Count
CP
2
GK II
1
Nehru Place
2
(iii)
Count
3
(iv)
IName
discount
Keyboard
25
Motherbaord
650
Key Board
20
Hard Disk
225
Q PAPER2013
Question 5 :
(10 Marks)
(a) Explain the concept of the candidate keys with the help of an
appropriate example.
NOTE:
Write SQL queries for (b) to (g) and write the outputs for the
SQL queries mentioned in (h1) to (h4) parts on the basis of
tables; PRODUCTS and SUPPLIERS.
Table: PRODUCTS
PNAM QT
PI
PRIC
SUPCOD
COMPANY
E
Y
D
E
E
DIGITAL
101
120 12000 RENIX
S01
CAMERA 14X
DIGITAL PAD
102
100
2200 DIGI POP
S02
11i
PEN DRIVE 16
104
500
1100 STOREKING
S01
GB
LED SCREEN
DISPEXPERT
106
70
28000
S02
32
S
CAR GPS
105
60
12000 MOVEON
S03
SYSTEM
Table: SUPPLIERS
SUPCODE
SNAME
CITY
S01
S03
S02
GET ALL INC
EASY MARKET CORP
DIGI BUSY GROUP
KOLKATA
DELHI
CHENNAI
(b) To display the details of all the products in the ascending
order of the product names (i.e., PNAME).
(c) To display the product name and the price of all those
products, whose price is in the range of 10,000 and 15,000 (both
values inclusive).
(d) To display the number of products, which are supplied by
each supplier, i.e., the expected output should be:
S01 2
S02 2
S03 1
(e) To display the price, product name and quantity (i.e., qty) of
those products that have quantity more than 100.
(f) To display the names of those suppliers, who are either from
DELHI or from CHENNAI.
(g) To display the names of the companies and the products in
the descending order of the company names.
(h) Obtain the outputs of the following SQL queries based on the
data given in the tables; PRODUCTS and SUPPLIERS, above.
(h1) SELECT DISTINCT SUPCODE FROM PRODUCTS;
(h2) SELECT MAX(PRICE), MIN(PRICE) FROM
PRODUCTS;
(h3)SELECT PRICE*QTY AMOUNT
FROM PRODUCTS WHERE PID=104;
(h4) SELECT PNAME, SNAME
FROM PRODUCTS P, SUPPLIERS S
WHERE P.SUPCODE=S.SUPCODE AND QTY>100;
[2+1+1+1+1+1+1+2 = 10]
ANSWERS
Answer 5 :
(10 Marks)
(a). Candidate key: A candidate key is a single field or the least combination of
fields other than the primary key that uniquely identifies each record in the table.
In the table below, the StudentId is working as a primary key, where as we can
define the firstName as the candidate key to uniquely identify the record.
(b) SELECT * FROM PRODUCTS
ORDER BY PNAME ASC;
(c) SELECT PNAME, PRICE
FROM PRODUCTS
WHERE PRICE BETWEEN 10000 AND 15000;
(d)SELECT PRODUCTS.SUPCODE, COUNT (SUPCODE)
FROM PRODUCTS, SUPPLIERS
GROUP BY PRODUCT.SUPCODE;
HAVING PRODUCTS.SUPCODE=SUPPLIERS.SUPCODE;
(e) SELECT PRICE, PNAME, QTY
FROM PRODUCTS
WHERE QTY>100;
(f) SELECT PNAMES
FROM PRODUCTS P, SUPPLIERS S
WHERE P.SUPCODE=S.SUPCODE AND
CITY IN (DELHI, CHENNAI);
(g) SELECT COMPANY, PNAME
FROM PRODUCTS
ORDER BY COMPANY DESC;
(h)
(h1)
SUPCODE
S01
S02
S03
(h2)
MAX(PRICE)
MIN(PRICE)
28000
1100
(h3)
AMOUNT
550000
(h4)
PNAME
SNAME
DIGITAL CAMERA 14X
GET ALL INC
PEN DRIVE 18 GB
GET ALL INC
Q PAPER 2012
(8
Marks
)
Question 5 : a) Give a suitable example of a table with sample data and
illustrate Primary and Alternate Keys in it.
Consider the following tables CARDEN and CUSTOMER and answer
(b) and (c) parts of this question:
Table: CARDEN
Ccode
CarName
Make
Color
Capacity
Charges
501
A-star
Suzuki
RED
3
14
503
Indigo
Tata
SILVER
3
12
502
Innova
Toyota
WHITE
7
15
509
SX4
Suzuki
SILVER
4
14
510
C Class
Mercedes
RED
4
35
Table: CUSTOMER
CCode
Cname
Ccode
1001
Hemant Sahu
501
b) Write SQL
commands for the
1002
Raj Lal
509
following:
(i) To display the
1003
Feroza Shah
503
names of all the
silver colored
1004
Ketan Dhal
502
Cars.
(ii)To display the
name of the car, make and capacity of cars in descending order of their
sitting capacity.
(iii)To display the highest charges at which vehicle can be hired from
CARDEN.
(iv) To display the customer name and the corresponding name of the
cars hired by them.
c) Give the output of the following SQL queries:
(i) SELECT COUNT(DISTINCT Make) FROM CARDEN;
(ii) SELECT MAX(Charges),MIN(Charges) FROM CARDEN;
(iii) SELECT COUNT(*), Make FROM CARDEN;
(iv) SELECT CarName FROM CARDEN WHERE Capacity =4;
[2+4+2 =8]
ANSWERS
Answer 5 :
(8 Marks)
(a).Primary Key – A primary key is a candidate key that is most appropriate to be
the main reference key for the table. Primary keys are mandatory for every table.
Alternate Key – We can define more than one primary key in a table. All these
keys are collectively known as candidate keys. Out of which one who is selected
as the primary key but those who are not selected are known as secondary keys or
alternative keys.
For example, in the above table showing the studentId would be the most
appropriate for a primary key leaving the other candidate key as secondary or
alternative key.
(b).
(i)SELECT CarName FROM CARDEN WHERE Color = “SILVER”;
(ii) SELECT CarName, Make, Capacity FROM CARDEN ORDER BY Capacity
desc;
(iii) SELECT MAX(Charges) AS “Highest Charges” FROM CARDEN
(iv) SELECT CName, CarName FROM CUSTOMER, CARDEN WHERE
CUSTOMER.CCode = CARDEN.Ccode
(c)
Q PAPER 2011
Question 5 : a) What do you understand by Selection & Projection operations in
relational algebra?
Consider the following tables EMPLOYEE and SALGRADE and answer (b) and (c)
parts of this questions:
Table : EMPLOYEE
ECODE
NAME
DESIG
SGRADE
DOJ
DOB
101
Abdul
EXECUTIVE
S03
23-Mar13-JanAhmad
2003
1980
102
Ravi
HEAD-IT
S02
12-Feb22-JulChander
2010
1987
103
John Ken
RECEPTIONIST
S03
24-Jun—
24-Feb2009
1983
105
NazarAmeen
GM
S02
11-Aug03-Mar2006
1984
108
PriyamSen
CEO
S01
29-Dec19-Jan2004
1982
Table : SALGRADE
SGRADE
SALARY
HRA
S01
56000
18000
S02
32000
12000
S03
24000
8000
b) Write SQL commands for the following statements:
(i) To display the details of all EMPOYEEs in descending order of DOJ.
(ii) To display NAME and DESIG of those EMPLOYEEs, whose SALGRADE is either
S02 or S03.
(iii) To display the content of all the EMPLOYEEs table, whose DOJ is in between ’09Feb-2006’ and ’08-Aug-2009’.
(iv) To add a new row with the following :109, ‘Harish Roy’, ‘HEAD-IT’, ‘S02’, ’09-Sep2007’, ’21-Apr-1983’
c) Give the output of the following SQL queries:
(i) SELECT COUNT(SGRADE), SGRADE FROM EMPLOYEE GROUP By SGRADE;
(ii) SELECT MIN(DOB), MAX(DOJ) FROM EMPLOYEE;
(iii) SELECT NAME, SALARY FROM EMPLOYEE E, SALGRADE S WHERE
E.SGRADE = S.SGRADE AND E.ECODE < 103;
(iv)SELECT SGRADE, SALARY + HRA FROM SALGRADE WHERE SGRADE =
‘S02’;
[ 2+4+2 = 8]
ANSWERS
Answer 5 :
(8 Marks)
(a) The select operation selects tuples(horizontal subset) from a relation that specify a given
condition. It is denoted by a lowercase Greek letter ( ) known as “sigma”.
The project operation yields a “vertical” subset of a given relation in contrast to the
“horizontal” subset returned by select operation. It is denoted by Greek letter ( ) known
as “pi”.
(b)
(i)Select * From EMPLOYEE Order By DOJ Desc;
(ii)Select NAME, DESIG From EMPLOYEE Where (SGRADE = ‘S02’ OR SGRADE =
‘S03’);
(iii)Select * From EMPLOYEE Where DOJ Between ’09-Feb-2006’ AND ’08-Aug-2009’;
(iv)Insert Into EMPLOYEE (ECODE,NAME,DESIG,SGRADE,DOJ,DOB)
Values(109, ‘Harish Roy’, ‘Head-IT’,’S02’, ’09-Sep-2007’, ’21-Apr-1983’);
(c)
(i)
COUNT
2
2
1
SGRADE
S03
S02
S01
(ii)
DOB
DOJ
22-Jul-1987 12-Feb-2010
(iii)
NAME
SALARY
Abdul Ahmad
Ravi Chander
24000
32000
(iv)
SGRADE
SALARY
S02
44000
QPAPER 2010
Question 5 :
(8 M
a) What do you understand by Candidate Keys in a table? Give a
suitable example of candidate keys from a table containing some
meaningful data. (2)
b) Consider the following tables STORE and SUPPLIERS and answer
b1 and b2 part of this question.
Table: STORE
Item
Item
Scode Qty Rate LastBuy
No.
2005
Sharpener Classic
23
60
8
31-Jan-09
2003
Ball Pen 0.25
22
50
25
01-Feb-10
2002
Gel Pen Premium
21
150
12
24-Feb-10
2006
Gel Pen Classic
21
250
20
11-Mar-09
2001
Eraser Small
22
220
6
19-Jan-09
2004
Eraser Big
22
110
8
02-Dec-09
2009
Ball Pen 0.5
21
180
18
03-Nov-09
Table : SUPPLIERS
Scode
21
Sname
Premium
Stationary
23
Soft Plastic
22
Tetra Supply
b1) Write SQL commands for the following statements: (4)
i. To display details of all the items in the Store table in ascending order
of LastBuy.
ii. To display the Item No and Item name of those items from store table
whose Rate is more than 15 Rupees.
iii. To display the details of those items whose Supplier code(Scode) is
22 or Quantity in store(Qty) is more than 110 from the table Store.
iv. To display Minimum Rate of items for each Suppliers individually as
per Scode from the table Store.
b2) Give the output of the following SQL queries: (2)
i) SELECT COUNT(DISTNICT Scode) FROM Store;
ii) SELECT Rate *Qty FROM Store WHERE Item No=2004;
iii) SELECT Item, Sname FROM Store S, Suppliers P WHERE
S.Scode=P.Scode AND Item No=2006;
iv) SELECT MAX(LastBuy) FROM Store;
A
ANSWERS
Answer 5 :
(8 Marks)
a) A table may have more than one such attribute/group of attributes that identifies
a tuple uniquely, all such attributes are known as candidate key. For example
Table: Item
Ino
Item
Qty
I01
I02
I04
I09
I05
I03
Pen
Pencil
CD
Long File
Eraser
Duster
560
780
450
350
250
128
From above table Ino and Item are treated as the candidate keys.
b) b1) i) SELECT * FROM STORE ORDER BY LastBuy ;
ii) SELECT ItemNo, Item FROM STORE WHERE RATE >15 ;
iii) SELECT * FROM STORE WHERE Scode = 22 OR Qty>110 ;
iv) SELECT Scode MIN ( Rate ) From STORE GROUP BY Scode ;
b2) i) COUNT ( DISTINCEScode )
3
ii) Rate * Qty
880
iii) Item
Gel Pen Classic
Sname
Premium Stationary
iv)MAX ( LastBuy )
24-Feb-10
Q PAPER2009
Question 5 :
a) What do you understand by Primary key? Give a suitable
example of Primary key from a table containing some
meaningful data. (2)
b) Consider the following tables STOCK and DEALERS and
answer (b1) and (b2) parts of this question.
Table: STOCK
(8 Marks)
Item
No.
5005
Item
Scode
Qty
Rate
LastBuy
BallPen 0.5
102
100
16
31-Mar-10
5003
Ball Pen 0.25
102
150
20
01-Jan-10
5002
125
14
14-Feb-10
5006
GelPen
101
Premium
Gel Pen Classic 101
200
22
01-Jan-09
5001
Eraser Small
102
210
5
19-Mar -09
5004
Eraser Big
102
60
10
12-Dec-09
160
8
23-Jan -09
5009
Sharpener
103
Classic
Table: DEALERS
Dcode
Dname
101
Reliable Stationers
103
Classic Plastics
102
Clear Deals
b1) Write SQL commands for the following statements: (4)
i) To display details of all the Items in the Stock table in ascending
order of StockDate.
ii) To display ItemNo and Item name of those items from Stock
table whose UnitPrice is more than Rupees 10.
iii) To display the details of those items whose dealer code(Dcode)
is 102 or Quantity in Stock(Qty) is more than 100 from the table
Stock.
iv) To display Minimum UnitPrice of items for each dealer
individually as per Dcode from the table Store.
b2) Give the output of the following SQL queries: (2)
i) SELECT COUNT(DISTNICT Dcode) FROM Stock;
ii) SELECT *QtyUnitPrice From Stock WHERE Item No=5006;
iii) SELECT Item, Dname FROM Stock S, Dealers D
WHERE S.Dcode=D.Dcode AND ItemNo=5004;
iv) SELECT MIN(StockDate) FROM Stock;
ANSWERS
a) An attribute or set of attributes which are used to identify a tuple uniquely is
known as Primary Key. For Example: let us consider a table Dept with following
tuples and data.
Table: Dept
Deptno Dname
LOC
101
Computers
Ist Floor
102
English
II Floor
104
Biology
III Floor
109
Physics
IV Floor
105
Chemistry
V Floor
103
Maths
VI Floor
From above table Deptno is the
Primary Key.
b) b1) i) SELECT * FROM STOCK ORDER BY StockDate;
ii) SELECT ItemNo, Item FROM STOCK WHERE UnitPrice> 10;
iii) SELECT * FROM STOCK WHERE Dcode=102 OR Qty> 100;
iv) SELECT Dcode, MIN(UnitPrice) FROM STORE GROUP BY Dcode;
b2) i) COUNT(DISTINCE Dcode)
3
ii) QTY * UNITPRICE
4400
iii) ITEM
DNAME
Eraser Big
Clear Deals
iv)MIN(STOCKDATE)
01-JAN-09
Q PAPER 2008
Question 5 : (a) Differentiate between candidate key and primary key in context of RDBMS. [2]
(b) Consider the following tables Product and Client. Write SQL commands for the statement (i) to (iv) and give output for SQL
queries (v) to (viii). [6]
TABLE: PRODUCT
P_ID
Product Name
Manufacturer
Price
TP01
Talcum powder
LAK
40
FW05
Face wash
ABC
45
BS01
Bath soap
ABC
55
SH06
Shampoo
XYZ
120
FW12
Face wash
XYZ
95
TABLE: CLIENT
C_ID
Client Name
City
P_ID
01
Cosmetic shop
Delhi
FW05
06
Total health
Mumbai
BS01
12
Live life
Delhi
SH06
15
Pretty women
Delhi
FW12
16
Dreams
Bangalore
TP01
(i) To display the details of those clients whose city is Delhi.
(ii) To display the details of products whose price is in the range of 50 to 100(Both values included)
(iii) To display the client name, city from table Client and product name and price from table Product with their
corresponding matching P_ID.
(iv) To increase the price of all the products by 10.
(v) SELECT DISTINCT Address FROM Client;
(vi) SELECT Manufacturer, MAX(Price), Min(Price), Count(*)
FROM Product GROUP BY Manufacturer;
(vii) SELECT Client Name, Manufacturer Name
FROM Product, Client
WHERE Client.Prod_Id=Product.P_Id;
(viii) SELECT Product Name, Price*4;
FROM Products;
ANSWERS
Answer 5 :
(8 Marks)
(a) Candidate Key - A candidate key can be any column or a combination of columns that can qualify as unique key in database.
There can be multiple candidate keys in one table.
Primary Key - A primary key is a column or a combination of columns that uniquely identify a record. Only one candidate
key can be primary key.
One needs to be very careful in selecting the primary key as an incorrect selection can adversely impact the database
architect and future normalization. For a candidate key to qualify as a primary key, it should be non-null and unique in any
domain.
E.g.,
In customer table, every customer will have a customer ID and also a contact number. Customer ID will be unique for
every customer and Contact number is also unique as every telephone number is different. Both fulfill the criteria for
candidate keys.
Consider if a customer does not want to share his contact number, then contact number will be null. Since, primary key has
a constraint of non-null values, contact number cannot be used as primary key(even though it satisfies uniqueness criteria).
Customer Id can be used as primary key as it satisfies uniqueness as well as non-null criteria.
(b) (i) Select * from Client
Where City=”Delhi”;
(ii) Select * from Product
Where Price BETWEEN ( 50 AND 100);
(iii) Select ClientName, City, Product Name, Price
From Client, Product;
(iv) UPDATE Product
SET Price= Price + Price*.10;
(v) City(Distinct)
Delhi
Mumbai
Bangalore
(vi) Manufacturer
Max(Price)
Min(Price)
Count(*)
LAK
40
40
1
` ABC
55
45
2
XYZ
120
95
2
(vii) Client Name
Manufacturer Name
Cosmetic shop
Face wash
Total health
Live life
Pretty women
Dreams
(viii) Product Name
Talcum powder
Face wash
Bath soap
Shampoo
Face wash
Bath soap
Shampoo
Face wash
Talcum powder
Price*4
160
180
220
480
380
Q NO. 7 NETWORKING
Q. PAPER 2014
Question 7 :
(a) Write one characteristics each of 2G and 3G Mobile Technologies.
(b) What is the difference between Video Conferencing and Chat?
(c) Expand the following:
GPRS
CDMA
(d) Which type of network ( out of LAN, PAN and MAN ) is formed, when you connect two
mobiles using Bluetooth to transfer a picture file.
(e) Trine Tech Corporation ( TTC ) is professional consultancy company. The company is
planning to set up their new offices in India with its hub at Hyderabad. As network adviser,
you have to understand their requirement and suggest them the best available solutions. Their
queries are mentioned as (i) to (iv) below.
Physical Location of the blocks of TTC:
Block to Block distances( in Mtrs.)
Block(From)
Block(To)
Distance
(10 Marks
Human Resource
Human Resource
Conference
Conference
Finance
Finance
110
40
80
Expected Number of Computers to be installed in each block
Block
Computers
Human Resource
25
Finance
120
Conference
90
(i) What will the most appropriate block, where TTC should plan to install
their server?
(ii) Draw a block to cable layout to connect all the buildings in the most
appropriate manner for efficient communication.
(iii) What will be the best possible connectivity out of the following, you will
suggest to connect the new setup of offices in Bangalore with its
London based office.
Satellite Link
Infrared
Ethernet Cable
(iv) Which of the following device will be suggested by you to connect each
computer in each of the buildings?
Switch
Modem
Gateway
(f) Write names of any two popular Open Source Software, which are used as operating
system.
(g) Write any two important characteristics of Cloud Computing.
[1+1+1+1+1+1+1+1+1+1=10]
ANSWERS
Answer 7 :
(10 Marks)
(a) Characteristic of 2G Mobile Technologies 2G Mobile technology allows the dial–up data calls digitally, so that the network’s switching station
receives actual ones and zeroes rather than the screech of an analog modem.
Characteristic of 3G Mobile Technology 3G mobile communication technology is a broadband, packet-based transmission of media files at data
rates up to 2Mbps, offering a consistent set of services to mobile computer and phone users no matter
where they are located in the world.
(b) The video conferencing is a two-way videophone conversation (where participants are visible to each other) among
multiple participants at a time where as, chatting is an online textual talk in real time.
(c)
 GPRS- General Packet Radio Service
 CDMA- Code Division Multiple Access
(d) PAN (Private Area Network) will be formed, when we connect two mobiles using Bluetooth.
(e)
(i) Finance is the most appropriate block, where TTC should plan to install their server
(ii)
(iii) Ethernet cable
(iv) Switch
(f) The two popular Open Source Softwares used as operating system are Linux
 OpenSolaris
(g) Two important characteristics of cloud computing In cloud computing price of deploying applications in the cloud results in lower hardware costs.
 Cloud computing allows a business to use, access and pay only for what they use, with a fast
implementation time.
Q. PAPER 2013
Question 7 :
(a) Write the two advantages of using an optical fibre cable over an
Ethernet cable to connect the two service stations, which are 200 m
away from each other.
(b) What is the difference between HTTP and FTP?
(c) Rovenza Communications International (RCI) is an online
corporate training provider company for IT related courses. The
(8 Marks)
company is setting up their new campus in Kolkata. You, as a
network expert, have to study the physical locations of the various
blocks and the number of computers to be installed. In the planning
phase, provide the best possible answer for the queries (i) to (iv)
raised by them.
Block to Block distance( in Mtrs.)
From
To
Administrative Block
Administrative Block
Finance Block
Faculty Recording Block
Finance Block
Faculty Recording Block
Expected Computers to be installed in each block
Block
Computers
Distance
60
120
70
Administrative
30
Block
Finance Block 20
Faculty
Recording
100
Block
(i) Suggest the most appropriate block, where RCI should plan to
install the server.
(ii) Suggest the most appropriate block to block cable layout to
connect all the three blocks for efficient communication.
(iii) Which type of network, out of the following, is formed by
connecting the computers of these three blocks?
. LAN
. MAN
. WAN
(iv) Which wireless channel, out of the following, should be opted by
RCI to connect to students from all over the world?
. Infrared
. Microwave
. Satellite
(d) Write the two advantages of using open source software over
proprietary software.
(e) Which of the following crime(s) does not come under cybercrime?
(i) Copying some important data from a computer without taking
permission from the owner of the data.
(ii) Stealing keyboard and mouse from a shop.
(iii) Getting into unknown person’s social networking account and
start messaging on his behalf. [1+1+4+1+1 = 8]
ANSWERS
Answer 7 :
(8 Marks)
(a). The advantages of using the fibre optic cables over the Ethernet
cables are as follows:
1. The fibre optic cables have the faster data transmission rates over
the Ethernet cables whereas an Ethernet uses either a bus or star
topology and supports the data transfer rates of up to 10 Mbps.
2. The fibre optic cables are immune to the electrical and magnetic
interference because the information travelling through them travels
on a modulated light beam.
(b) The differences between HTTP and FTP are:
HTTP
FTP
It is an abbreviated form
ofHypertext Transfer
Protocol. It is a protocol that
is used to upload files from
a workstation to an FTP
server.
It supports hypertext or
hypermedia files such as
multimedia documents that
contain links to images,
sounds or other multimedia
documents on the World
Wide Web.
It is an abbreviated form
of File Transfer Protocol. It
is a protocol that is used to
transfer the files from a
Web server onto a browser
to view a Web page.
It supports text and binary
files that are organised in a
hierarchical structure,
much like a family tree.
(c)
(i) Faculty recording building
(ii) Finance building
(iii) MAN
(iv) Satellite
(d) The advantages of proprietary software over open source
software are as follows:
Open source
Proprietary software
They are the software
distributed under a licensing
agreement, which allow the
source code to be shared,
viewed and modified by the
other users and
organisations.
They are available free of
cost.
They are the software distributed
under a licensing agreement to
the authorised users with the
private modification, copying and
republishing restrictions.
The user has to pay the amount
defined to get such software.
(e) (i) Stealing keyboard and mouse from a shop.
Q PAPER 2012
Question 7 :
a) What out of the following, will you use to have an audio-visual chat
with an expert sitting in a far-away place to fix-up a technical issue?
(i) VoIP
(ii)email
(iii)FTP
b) Name one server side scripting language and one client-side
scripting language.
c) Which out of the following comes under Cyber Crime?
(i) Operating someone’s Internet banking account,
without his knowledge.
(ii) Stealing a keyboard from someone’s computer.
(iii)Working on someone’s computer with his/her permission.
d) Write one advantage of Bus topology of network. Also, illustrate
how 4 computers can be connected with each other using star
topology of network.
e) Workalot Consultants are setting up a secured network for their
office campus at Gurgoan for their day-to-day office and web-based
activities. They are planning to have connectivity between 3 buildings
and the head office situated in Mumbai. Answer the questions(i) to
(iv) after going through the building positions in the campus and
(10 Marks)
other details, which are given below:
Distances between various buildings
Building “GREEN” to Building “RED”
110m
Building “GREEN” to Building “BLUE”
45m
Building “BLUE” to Building “RED”
65m
Building Campus to Head Office
Number of Computers
Building “GREEN”
Building “RED”
1760km
32
150
Building “BLUE”
45
Head Office
10
(i) Suggest the most suitable place (i.e. building) to house the server of
this organization. Also give a reason to justify your suggested
location.
(ii) Suggest a cable layout of connections between the buildings inside
the campus.
(iii) Suggest the placement of the following devices with justification:
1. Switch
2. Repeater
(iv)The organization is planning to provide a high speed link with its
head office situated in MUMBAI using a wired connection. Which of
the following cables will be most suitable for this job?
1) Optical Fiber
2) Co-axial cable
3)Ethernet cable
f) Give one suitable example of each URL and Domain Name.
g) Name two Proprietary softwares along with their
applications. [1+1+1+1+4+1+1 = 10]
ANSWERS
Answer 7 :
(10 Marks)
(a). (ii) VoIP
Voice over IP (VoIP) commonly refers to the communication
protocols which consist of the transmission techniques involved in
the delivery of voice communications and multimedia sessions
over Internet Protocol (IP) networks, such as the Internet.
(b). One client side scripting is Java Script.
One server side script is JSP (Java Server Page).
(c). (i) Operating someone’s Internet banking account, without
his knowledge.
(d). The advantage of Star Topology of network:
In bus topology all the nodes are connected in a linear fashion
with a single continuous cable.
The main advantage of a Bus Topology is that, the Bus Topology is
easy to set-up and easy to extend the nodes in a network.
The four computers can be connected with each other using Star
Topology of network. In which one computer would be the central
node which will work as a server. The other three computers
would be connected to the central node called server. The
communication between each node will take place through the
server.
(e)
(e1) Building “RED” is the most suitable place for the server as it
contains maximum numbers of computers.
(e2) We can use any of the following topology to design the
layout:
Bus Topology: In bus topology all the nodes are connected in a
linear fashion with a single continuous cable.
Star Topology: In star topology all the nodes are connected to a
central hub/switch to form a network.
(e3) Switch- Every Building will need 1 switch, to send signals to
all the workstations connected to it.
Repeater - A repeater should be placed when the distance
between any two connecting computers exceeds 70m.
(e4)
(i) Optical Fiber can be used for a high speed link.
(f) URL- www.yahoo.com, www.google .com etc
Domain Names - .com, .gov, .edu etc
(g) Proprietary softwares are softwares that are exclusive property
of their developers or publishers, and they cannot be copied or
distributed without complying with their licensing agreements.
The Two Proprietary software’s are:
(i) Microsoft Windows – Microsoft Windows is a series of
software operating systems and graphical user interfaces
produced by Microsoft.
(ii) Adobe Flash Player - The Adobe Flash Player is software for
viewing animations and movies using computer programs such as
a web browser.
Q PAPER 2011
Question 7 : a) In Networking , what is WAN ? How is it
different from LAN?
b) Differentiate between XML and HTML.
c) What is WEB 2.0?
d) Out of the following, identify client-side script(s) and
server-side script(s).
i) Javascript
ii) ASP
iii) vbscript
iv) JSP
e) Great Studies University is setting up its Academic
schools at Sunder Nagar and planning to set up a
network. The university has 3 academic schools and
one administration center as shown in the diagram
below:
Center to center distances between various buildings is
as follows:
Law School to Business School
60 m
Law School to Technology School
90 m
Law School to Admin Center
115 m
Business School to Technology School
40 m
Business School to Admin Center
45 m
Technology School to Admin Center
25 m
Number of Computers in each of the Schools/Center is
follows:
Law School
25
Technology school
50
Admin Center
125
Business School
35
(i)Suggest the most suitable place (i.e. Schools/Center)
to install the server of this university with a suitable
(10 Marks)
reason.
(ii) Suggest an ideal layout for connecting these
schools/center for a wired connectivity.
(iii) Which device will you suggest to be
placed/installed in each of these schools/center to
efficiently connect all the computers within these
schools/center ?
(iv) The university is planning to connect its admission
office in the closest big city, which is more than 350 km
from theuniversity. Which type of network out of LAN,
MAN or WAN will be formed? Justify your answer.
f) Compare Open Source Software and Proprietary
Software.
g) What are cookies?
[1+1+1+1+4+1+1 = 10]
ANSWERS
Answer 7 :
(10 Marks)
(a) A computer network that spans over a relatively large geographical
area. Typically, a WAN consists of two or more local-area
networks (LANs). A LAN is computer network that spans over a relatively
small area. Most LANs are confined to a single building or group of
buildings.
Computers connected to a wide-area network are often connected through
public networks, such as the telephone system. They can also be connected
through leased lines or satellites. The largest WAN in existence is the
Internet.
(b) XML-eXtensible Markup Language: Is a markup language for documents
containing structured information.
HTML-HyperText Markup Language: Document-layout and hyperlinkspecification language.
(c) Web 2.0 refers to a new generation of applications that are social in
nature. They allow for collaboration, information exchange, and are useroriented. Facebook and MySpace are prime examples of Web 2.0 sites.
(d) Client-Side Script — Javascript , vbscript
Server-Side Script — ASP, JSP
(e)
(i) Admin Center
(ii) STAR Topology
(iii) Hub/Switch
(iv) WAN(Wide Area Network)
The connection between admission office to the closest big city will be
through WAN. It is span over a larger distance so dedicatedlines are not
possible. Here connections are made using radio waves or satellites.
(f) Open source software is free to download therefore lower in cost,
whereas, Proprietary software is computer software licensed under
exclusive legal right of the copyright holder. The licensee is given the right
to use the software under certain conditions, but restricted from other uses,
such as modification, further distribution, or reverse engineering.
(g) Cookies are the bits of data put on a hard disk when someone visits
certain websites. The cookie on the hard disk has the username and
password in it, so people don’t have to log in.
Q.PAPER 2010
Answer 7 :
Question 7 :
a) What was the role of APARENT in Computer
Networking? (1)
b) Which of the following is not a unit for data transfer
rate? (1)
i) mbps
ii) kbps
iii) sbps
iv) gbps
c) What is the difference between Virus and Worms in the
computers? (1)
d) What term do we use for a hardware/software device, which
is used to block unauthorized access while permitting
authorized communications. This term is also used for a device
or set of devices configured to permit, deny, encrypt, decrypt
or proxy all (in and out) computer traffic between different
security domains based upon a set of rules and other criteria.
(1)
e) ”Vidya For All” is an educational NGO. It is the setting up
its new campus at Jaipur for its web based activities. The
campus has four buildings as shown in the diagram below: (4)
(10 Marks)
Center to center distances between various Compounds as per
architectural drawings (in metres) is as follows:
Main Building to Resource Building
120m
Main Building to Training Building
40m
Main Building to Accounts Building
135m
Resource Building to Training Building
125m
Resource Building to Accounts Building
45m
Training Building to Accounts Building
110m
Expected Number of Computers in each Building is as follows:
Main Building
15
Resource Building
25
Training Building
250
Accounts Building
10
e1) Suggest a cable layout of connections between the buildings.
e2) Suggest the most suitable place (i.e., building) to house the
server for this NGO. Also, provide a suitable reason for your
suggestion.
e3) Suggest the placement of the following devices with
justification:
i) Repeater
i) Hub/Switch
e4) The NGO is planning to connect its international office
suitable in Delhi. Which, out of the following wired
communication link, will you suggest for very high speed
connectivity?
i) Telephone Analog Line
ii) Optical Fibrer
iii) Ethernet Cable
f) Write the null form of the following:
f1) FTP
f2) FSF
g) Name any two web browsers.
AnswerS
(10 Marks)
a) The first computer network was jointly designed by the
Advanced Research Projects Agency (ARPA) and department of
Defence (DOD) of United States in 1969 and was called ARPANET.
It was an experimental project which connected a few computers
from some of the reputed universities of USA and DOD. APRANET
allowed access to computer resource sharing projects. This
ARPANET was handed over to Defence Communication Agency
(DCA) for further development.
b) (iii)sbps
c) VIRUS: Virus is a malicious program that damages data and
files and causes harm to computer system.
WORM: A computer worm is a program which copies itself across
a network. A computer worm differs from a computer virus in that
a computer worm can run itself. A virus needs a host program to
run and the virus code runs as part of the host program. A
computer worm can spread without a host program, although
some modern computer worms also use files to hide inside.
d) Firewall
e) e1) The cable network layout is as follows:
e2) Training Building as it contains maximum numbers of
computers.
e3) i) A repeater should be placed when the distance between any
two connecting computers exceeds 70m.
ii) Every Building will need 1 hub/Switch, to send singles to all the
workstations connected to it.
e4) (ii) Optical Fibre
f) f1) File Transfer Protocol
f2) Free Software Foundation
g) Web Browser:
i) Internet Explorer
ii) Mozilla Firefox
Q PAPER 2009
Question 7 :
(8 Marks)
a) What is the difference between LAN and WAN? [ 1]
(b) Expand the following abbreviations: [1]
(i) HTTP
(ii) ARPANET
( c) What is protocol? Which protocol is used to copy a file from/to a remotely located
server? [1]
(d) Name two switching techniques used to transfer data between two terminals
(computers). [1]
(e) Eduminds University of India is starting its first campus in a small town Parampur
of Central India with its center admission office in Delhi. The University has 3 major
buildings comprising of Admin Building, Academic Building and Research Building in
the 5 KM area Campus.
As a network expert, you need to suggest the network plan as per (E1) to (E4) to the
authorities keeping in mind the distances and other given parameters.
Expected Wire distances between various locations:
Expected numbers of computers to be installed at various locations in the university
are as follows:
Research Building to Admin Building
90 m
Research Building to Academic Building
80 m
Academic Building to Admin Building
15 m
Delhi Admission Office to Parampur Campus
1450 km
Expected numbers of computers to be installed at various locations in the
university are as follows:
Research Building
Academic Building
Admin Building
Delhi Admission Office
20
150
35
5
(E1) Suggest to the authorities, the cable layout amongst various buildings
inside the university campus for connecting the buildings. [1]
E2) Suggest the most suitable place (i.e. building) to house the server of this
organization, with a suitable reason. [1 ]
(E3) Suggest an efficient device from the following to be installed in each of the
buildings to connect all the computers: [1]
(i) GATEWAY
(ii) MODEM
(iii) SWITCH
(E4) Suggest the most suitable (very high speed) service to provide data connectivity
between Admission Building located in Delhi and campus located in Parampur from the
following options: [ 1]






Telephone line
Fixed-Line Dial-up connection
Co-axial Cable Network
GSM
Leased line
Satellite connection
ANSWERS
Answer 7 :
(8 Marks)
(a) There are two basic types of network, LAN and WAN.
LAN stands for Local Area Network, while WAN stands for Wide Area Network.
Local Area Networks are smaller networks, usually within an office base. Connections
between the workstations are physical with cables and all the office resources are
shared and distributed between the network workstations.
WAN or Wide Area Networks, are broader geographic networks, like one city to another. They
are more of a collection of interconnected LAN networks.
The main difference between LAN and WAN is in their data transfer rate. LANs are faster, with
10Gbit data transfer rates.
(b) HTTP: Hyper Text Transfer Protocol
ARPANET: Advanced Research Projects Agency Network
(c) A protocol is a set of rules that end points in a telecommunication connection use when
they communicate. Protocols exist at several levels in a telecommunication connection. For
example, there are protocols for the data interchange at the hardware device level and
protocols for data interchange at the application program level. File Transfer Protocol (FTP) is
used to copy a file from/to a remotely located computer.
(d)
The two types of switching techniques used to transfer data between two terminals are:
Circuit Switching: This method involves the physical interconnection of two devices. A good
example of circuit switching involves the public phone network.
Packet Switching: Packet Switching techniques switch packets of data between destinations.
Traditionally, this applied to X.25 techniques, but this also applies to TCP/IP and IPX/SPX
routers. Proprietary Frame Relay switches can switch voice signals.
(E1)
(E2) The most suitable place to house the server of this organization is Academic
Building, as this location has maximum number of computers installed. This will reduce
the network traffic, as most of the traffic will be local and also decrease the cost.
(E3) SWITCH
(E4) Satellite connection is required to provide data connectivity between Admission Building located in Delhi and
Parampur because they are very far located from each other.