Saturday, 11 February 2017

NIELIT A Level Solved Paper July-2016

A9-R4: DATA COMMUNICATION & NETWORK TECHNOLOGIES


PART ONE
(Answer all the questions)

 1. Each question below gives a multiple choice of answers. Choose the most appropriate one and enter in the “OMR” answer sheet supplied with the question paper, following instructions therein. (1x10)
1.1 The ________ address identifies a
process on a host.
A) specific
B) port
C) IP
D) physical
1.2 When a host on network A sends a message to
a host on network B, which address does the
router look at?
A) logical
B) physical
C) port
D) none of the above

1.3 If the maximum amplitude of a sine wave is 2 V,
the minimum amplitude is ________ V.
A) 2
B) 1
C) -2
D) between -2 and 2
1.4 A periodic signal completes one cycle in 0.001
s. What is the frequency?
A) 1 Hz
B) 100 Hz
C) 1 KHz
D) 1MHz
1.5 If the frequency spectrum of a signal has a
bandwidth of 500 Hz with the highest
frequency at 600 Hz, what should be the
sampling rate, according to the Nyquist
theorem?
A) 200 samples/s
B) 500 samples/s
C) 1000 samples/s
D) 1200 samples/s
1.6 When the angle of incidence is ________ the
critical angle, the light beam bends along the
interface.
A) less than
B) equal to
C) more than
D) none of the above
1.7 If the Hamming distance between a dataword
and the corresponding codeword is three, there
are ________ bits in error.
A) 5
B) 4
C) 3
D) none of the above
1.8 An IPv6 address can have up to ________
colons.
A) 8
B) 7
C) 4
D) none of the above
1.9 Which of the following is true about ICMP
messages?
A) An ICMP error message may be generated for
an ICMP error message.
B) An ICMP error message may be generated
only for the first fragment.
C) An ICMP error message may be generated for
a multicast datagram.
D) None is true
1.10 An organization is granted a block; one
address is 2.2.2.64/20. The organization needs
10 subnets. What is the subnet prefix length?
A) /20
B) /24
C) /25
D) none of the above

2. Each statement below is either TRUE or FALSE. Choose the most appropriate one and enter your choice in the “OMR” answer sheet supplied with the question paper, following instructions therein. (1x10)

2.1 The minimum size of a TCP / IPv4 packet
which you can send is 41 bytes.
2.2 In public key encryption, both the encryption
algorithm and encryption key is known to
everyone but the decryption key is known only
to the receiver.
2.3 split horizons is when Information about a
route is not sent back in the direction from
which the original update came.
2.4 In 1-persistent CSMA, a station that has a
frame to send, senses the line. If the line is
idle, it sends immediately. If the line is not idle,
it waits a random amount of time and then
senses the line again.
2.5 SSL provides privacy, integrity, and
authentication in e-mail.
2.6 A manager is a host that runs the SNMP Client
process.
2.7 Infrared waves are more secure as they cannot
propagate through opaque objects such as
walls.
2.8 Peer-to-peer (P2P) is a centralized
communications model in which each party
has the same capabilities and either party can
initiate a communication session.
2.9 GSM is a digital cellular phone system using
both FDMA and TDMA.
2.10 A Stop and wait protocol uses a sliding window of size 1.

3. Match words and phrases in column X with the closest related meaning/ word(s)/phrase(s) in
column Y. Enter your selection in the “OMR” answer sheet supplied with the question paper,
following instructions therein. (1x10)

X
Y
3.1
Stop Network Loops
A.
Inverse domain
3.2
Protocol using hop count as metric
B.
SMI
3.3
The stations share the bandwidth of the channel in time.
C.
AMPS
3.4
Maps Hardware address to IP Address
D.
AH
3.5
Variable declaration in Network Management
E.
Route Poisoning
3.6
Layer uses both header and trailer
F.
TDMA
3.7
map an address to a name
G.
RIP
3.8
first-generation cellular phone system
H.
Network
3.9
Does Authentication at the IP level
I.
MIB
3.10
Routed protocol
J.
RARP


K.
DLL


L.
IP


M.
GSM

4. Each statement below has a blank space to fit one of the word(s) or phrase(s) in the list below.
Choose the most appropriate option, enter your choice in the “OMR” answer sheet supplied with the question paper, following instructions therein. (1x10)

A.
Analog to Digital
B.
Tunnel
C.
flag
D.
Slow start
E.
Omnidirectional
F.
Flooding
G.
Circuit Switching
H.
Microwaves
I.
LCP
J.
TCP
K.
Analog to Analog
L.
Radio waves
M.
Transport





4.1 AM and FM are examples of ________ conversion.
4.2 HTTP uses the services of ________ on well-known port 80.
4.3 In the ________ mode, IPSec protects information delivered from the transport layer to the network layer.
4.4 ________ broadcasts packets, but creates loops in the systems.
4.5 Radio waves are ________.
4.6 Bit stuffing means adding an extra 0 to the data section of the frame when there is a sequence of bits with
the same pattern as the ________.
4.7 In the ________ algorithm of TCP, the size of the congestion window increases exponentially until it
reaches a threshold.
4.8 In PPP, the ________ is responsible for establishing, maintaining, configuring, and terminating links.
4.9 ________ are used for cellular phone, satellite, and wireless LAN communications.
4.10 In ________ the resources need to be reserved during the setup phase; the resources remain dedicated for
the entire duration of data transfer phase until the teardown phase.

PART TWO
(Answer any FOUR questions)

5.
a) Explain CSMA and CSMA/CA Protocols in
detail.
b) Explain why ARP protocol is required along
with its working?
(10+5)
6.
a) Explain Distance Vector Routing protocol and
how is it different from Link State Protocol?
b) Highlight the differences between IPv4 and
IPv6
c) Identify the Network and Host Id of the
following:
i) 192.16.23.4
ii) 133.38.21.5
iii) 87.126.99.100
(8+4+3)
7.
a) Explain the concept of Sliding window protocol
along with go-back-n and selective repeat
Sliding window protocols?
b) Explain the concept of Synchronous and
Asynchronous Transmission
c) Why is Modulation required?
(9+4+2)
8.
a) Explain why is a minimum frame size required
on Ethernet? What changes were made in Fast
Ethernet and Gigabit Ethernet regarding the
same?
b) If the data frame is 1101011011, and generator
is 10011, what is the transmitted frame using
CRC Technique?
(9+6)
9.
a) Distinguish between CDMA, FDMA and TDMA.
b) Write Short notes on:
i) NFS
ii) VLAN
iii) VSAT
iv) GSM
v) SNMP
(5+10)
*****