Data Communication and Networking

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Welcome to NTA NET ASPIRANT ACADEMY

NTA NET ASPIRANT ACADEMY is a training academy for College Lectures, Assistant Professor, Research Scholar and PG Students to make qualified for Assistant Professor & JRF in UGC NET / TNSET

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Congratulations - you have completed Data Communication and Networking. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

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Question 1

The period of a signal is 100ms. Then the frequency of this signal in kilohertz is __________ NTA NET JUNE 2020

A	10
B	10^-1
C	10^-2
D	10^-3

Question 2

Match List I with List II NTA NET JUNE 2020

List - I	List - II
A. Serial line IP (SLIP)	(i) Application Layer
B. Border Gateway Protocol	(ii) Transport Layer
C. User Datagram Protocol	(iii) Datalink Layer
D. Simple Network Management Protocol	(iv) Network Layer

Choose the correct answer from the options given below:

A	A - i, B - ii, C - iii, D - iv
B	A - iii, B - iv, C - ii, D - i
C	A - ii, B - iii, C - iv, D - i
D	A - iii, B - i, C - iv, D - ii

Question 3

Firewall is a device that filters access to the protected network from the outside network. Firewalls can filter the packets on the basis of NTA NET JUNE 2020
A. Source IP address
B. Destination IP address
C. TCP Source Port
D. UDP Source Port
E. TCP Destination Port
Choose the correct answer from the options given below:

A	(A), (B) and (C) only
B	(B) and (E) only
C	(C) and (D) only
D	(A), (B), (C), (D) and (E) only

Question 4

Post office protocol (POP) is a message access protocol which is used to extract message for client. In this regard, which of the following are true? NTA NET JUNE 2020
A. Pop has two modes, Delete mode and keep.
B. In Delete mode, mail is deleted from mail box after each retrieval
C. In Delete mode, mail is deleted from mail box before each retrieval
D. In Keep mode, mail is deleted before retrieval
E. In Keep mode, mail remains in mail box after retrieval.
Choose the correct answer from the options given below:

A	(A) and (B) only
B	(A), (D) and (E) only
C	(A), (B), (C) and (D) only
D	(A), (B) and (E) only

Question 5

Given below are two statements: NTA NET JUNE 2020

Statement I: In Ceasar Cipher each letter of Plain text is replaced by another letter for encryption.
Statement II: Diffie - Hellman algorithm is used for exchange of secret key.
In the light of the above statements, choose the correct answer from the options given below:Both Statement I and Statement II are true.

A	Both Statement I and Statement II are true.
B	Both Statement I and Statement II are false.
C	Statement I is true but Statement II is false.
D	Statement I is false but Statement II is true.

Question 6

Protocols in which the sender sends one frame and then waits for an acknowledgement before proceeding for next frame are called as _________ NTA NET JUNE 2020

A	Simplex protocols
B	Unrestricted simplex protocols
C	simplex stop and wait protocols
D	Restricted simplex protocols

Question 7

Which of the following class of IP address has the last address as 223.255.255.255? NTA NET December 2019

A	Class A
B	Class B
C	Class C
D	Class D

Question 8

Consider a subnet with 720 routers. If a three - level hierarchy is chosen, with eight clusters, each containing 9 regions of 10 routers, then total number of entries in hierarchical table of each router is NTA NET December 2019

A	25
B	27
C	53
D	72

Question 9

Piconet is a basic unit of a bluetooth system consisting of _________ master node and up to _________ active slave nodes. NTA NET December 2019

A	one, five
B	one, seven
C	two, eight
D	one, eight

Question 10

Match List I with List II NTA NET December 2019

List - I	List - II
A. Physical layer	(i) Provide token management service
B. Transport layer	(ii) Concerned with transmitting raw bits over a communication channel
C. Session Layer	(iii) Concerned with the syntax and semantics of the information transmitted
D. Presented Layer	(iv) True end-to-end layer from source to destination

Choose the correct option from those given below:

A	A - ii, B - iv, C - iii, D - i
B	A - iv, B - iii, C - ii, D - i
C	A - ii, B - iv, C - i, D - iii
D	A - iv, B - ii, C - i, D - iii

Question 11

A network with bandwidth of 10 Mbps can pass only an average of 12,000 frames per minute with each frame carrying an average of 10,000 bits. What is the throughput of this network? NTA NET December 2019

A	1,000,000 bps
B	2,000,000 bps
C	12,000,000 bps
D	1,200,00,000 bps

Question 12

The full form of ICANN is NTA NET December 2019

A	Internet Corporation for Assigned Names and Numbers
B	Internet Corporation for Assigned Numbers and Names
C	Institute of Corporation for Assigned Names and Numbers
D	Internet Connection for Assigned Names and Numbers

Question 13

Consider the following statements with respect to network security: NTA NET December 2019
A. Message confidentiality means that the sender and the receiver expect privacy.
B. Message integrity means that the data must arrive at the receiver exactly as they were sent.
C. Message authentication means that the receiver is ensured that the message is coming from the intended sender.
Which of the statements is (are) correct?

A	(A) and (B) only
B	(A) and (C) only
C	(B) and (C) only
D	(A), (B) and (C) only

Question 14

Consider the following statements: NTA NET December 2019
A. Fiber optic cable is much lighter than copper cable.
B. Fiber optic cable is not affected by power surges or electromagnetic interference.
C. Optical transmission is inherently bidirectional.
Which of the following statements is / are correct?

A	Only (A) and (B)
B	Only (A) and (C)
C	Only (B) and (C)
D	(A), (B) and (C)

Question 15

When using Dijkstra's algorithm to find shortest path in a graph, which of the following statement is not true? NTA NET December 2019

A	It can find shortest path within the same graph data structure.
B	Every time a new node is visited, we choose the node with smallest known distance/cost (weight) to visit first.
C	Shortest path always passes through least number of vertices.
D	The graph needs to have a non - negative weight on every edge.

Question 16

Which of the following is not needed by an encryption algorithm used in Cryptography? NTA NET December 2019

A	Key
B	Message
C	Cipher text
D	User details

Question 17

Consider the following two statements with respect to IPv4 in computer networking: NTA NET JUNE 2019
P: The loopback (IP) address is a member of class B network.
Q: The loopback (IP) address is used to send a packet from host to itself.
What can you say about the statements P and Q?

A	P - True ; Q - False
B	P - False ; Q - True
C	P - True ; Q - True
D	P - False ; Q - False

Question 18

How many address lines and data lines are required to provide a memory capacity of 16K x 16? NTA NET JUNE 2019

A	10, 4
B	16, 16
C	14, 16
D	4, 16

Question 19

In the TCP / IP model, encryption and decryption are functions of _________ layer.

A	data link
B	network
C	transport
D	application

Question 20

What is the name of the protocol that allows a client to send a broadcast message with its MAC address and receive an IP address in reply? NTA NET JUNE 2019

A	ARP
B	DNS
C	RARP
D	ICMP

Question 21

You are designing a link layer protocol for a link with bandwidth of 1 Gbps ( 10⁹ bits/second) over a fiber link with length of 800 km. Assume the speed of light in this medium is 200000 km/second. what is the propagation delay in this link? NTA NET JUNE 2019

A	1 milliseconds
B	2 milliseconds
C	3 milliseconds
D	4 milliseconds

Question 22

A slotted ALOHA network transmits 200 - bit frames using a shared channel with a 200Kbps bandwidth. Find the throughput of the system, if the system(all stations put together) produces 250 frames per second: CBSE NET JULY 2018

A	49
B	368
C	149
D	151

Question 23

The period of a signal is 100 ms. Its frequency is __________. CBSE NET JULY 2018
1. 100³ Hertz
2. 10^-2 KHz
3. 2. 10^-3 KHz
4. 2. 10⁵ Hertz

A	1
B	2
C	3
D	4

Question 24

The dotted - decimal notation of the following IPv4 address in binary notation is ________. 10000001 00001011 00001011 11101111 CBSE NET JULY 2018

A	111.56.45.239
B	129.11.10.238
C	129.11.11.239
D	111.56.11.239

Question 25

Which of the following statements are true? CBSE NET JULY 2018
A. Advanced Mobile Phone System (AMPS) is a second generation cellular phone system.
B. IS - 95 is a second generation cellular phone system based on CDMA and DSSS.
C. The Third generation cellular phone system will provide universal personnel communication.

A	(A) and (B) only
B	(B) and (C) only
C	(A), (B) and (C)
D	(A) and (C) only

Question 26

Match the following symmetric block ciphers with corresponding block and key sizes: CBSE NET JULY 2018

List - I	List - II
A. DES	(i) Block size 64 and key size ranges between 32 and 448
B. IDEA	(ii) Block size 64 and Key size 64
C. BLOW FISH	(iii) Block size 128 and key sizes 128,192,256
D. AES	(iv) Block size 64 and key size 128

A	A - iv, B - ii, C - i, D - iii
B	A - ii, B - iv, C - i, D - iii
C	A - ii, B - iv, C - iii, D - i
D	A - iv, B - ii, C - iii, D - i

Question 27

Which of the following statements are true? CBSE NET JULY 2018
A. Three broad categories of Networks are
(i) Circuit Switched Networks
(ii) Packet Switched Networks
(iii) Message Switched Networks
B. Circuit Switched Network resources need not reserved during the set up phase.
C. In packet switching there is no resource allocation for packets.

A	(A) and (B) only
B	(B) and (C) only
C	(A) and (C) only
D	(A), (B) and (C)

Question 28

In Challenge - Response authentication the claimant ________. CBSE NET JULY 2018

A	Proves that she knows the secret without revealing it.
B	Proves that she doesn't know the secret
C	Reveals the secret
D	Gives a challenge

Question 29

Decrypt the message "WTAAD" using the Caesar Cipher with key = 15. CBSE NET JULY 2018

A	LIPPS
B	HELLO
C	OLLEH
D	DAATW

Question 30

To guarantee correction of upto t errors, the minimum Hamming distance d_min in a block code must be _______. CBSE NET JULY 2018

A	t + 1
B	t - 2
C	2t - 1
D	2t + 1

Question 31

Encrypt the Message "HELLO MY DEARZ" using Transposition Cipher with CBSE NET JULY 2018

Plain Text Key - 2 4 1 3

Cipher Text Key - 1 2 3 4

A	HLLEO YM AEDRZ
B	EHOLL ZYM RAED
C	ELHL MDOY AZER
D	ELHL DOMY ZAER

Question 32

Match the following Secret Key Algorithms (List I) with the Corresponding Key Lengths (List II) and choose the correct answer from the code given below. CBSE NET JULY 2018

List - I	List - II
A. Blowfish	(i) 128 - 256 bits
B. DES	(ii) 128 bits
C. IDEA	(iii) 1 - 448 bits
D. RC5	(iv) 56 bits

A	A - iv; B - iii; C - ii; D - i;
B	A - iii; B - iv; C - i; D - ii;
C	A - iii; B - iv; C - ii; D - i;
D	A - ii; B - iii; C - iv; D - i;

Question 33

The four byte IP address consists of CBSE NET JULY 2018

A	Network Address
B	Host Address
C	Both Network and Host Addresses
D	Neither Network nor Host Address

Question 34

Consider ISO - OSI network architecture reference model. Session layer of this model offers dialog control, token management and ______ as services. SynCBSE NET JULY 2018

A	Synchronization
B	Asynchronization
C	Flow control
D	Errors

Question 35

Suppose a cloud contains software stack such as Operating systems, Application softwares, etc. This model is referred as ____ model. CBSE NET JULY 2018

A	SaaS
B	PaaS
C	IaaS
D	MaaS

Question 36

The Third Generation mobile phones are digital and based on CBSE NET JULY 2018

A	AMPS
B	D - AMPS
C	CDMA
D	Broadband CDMA

Question 37

Which of the following statement is / are true? CBSE NET JULY 2018

(i) Firewalls can screen traffic going into or out of an organization.

(ii) Virtual private networks can simulate an old leased network to provide certain desirable properties.

Choose the correct answer from the code given below:

A	(i) only
B	(ii) only
C	Both (i) and (ii)
D	Neither (i) nor (ii)

Question 38

Which of the following statement is / are true? CBSE NET JULY 2018

(i) Window XP supports bot peer - peer and client - server networks.

(ii) Windows XP implements Transport Protocols as drivers that can be loaded and unloaded from the system dynamically.

Choose the correct answer from the code given below:

A	(i) only
B	(ii) only
C	Neither (i) nor (ii)
D	Both (i) and (ii)

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There are 38 questions to complete.