UGC NET Previous Year Questions | UGC NET PYQs Computer Science | Networking PYQs UGC NET December 2023 and June 2023

We will be providing past questions for National Eligibility Test (UGC NET) Computer Science (Networking). This will help you identify and prepare for the exam’s question trends. This time, we prepared questions focusing on major topics such as basic network concepts, TCP/IP, routing algorithms, and network security. We aim to help you gain a deeper understanding of networking through problem solving.

UGC NET December 2023

1. The work done by UDP is/are:

(A) Congestion control

(B) Flow control

(C) Retransmission

(D) Segments transmission

Choose the correct answer from the options given below :

i. (A) and (D) Only

ii. (C) Only

iii. (D) Only

iv. (B) and (C) Only

UGC NET December 2023

2. Has functions are used to produce the message digests which are then encrypted with a private key to get :

i. Public key

ii. Digital signature

iii. Cipher text

iv. Data Encryption Standard

UGC NET December 2023

3. Which of the following are example of CSMA channel sensing methods ?

(A) 1-persistent

(B) 2-persistent

(C) p-persistent

(D) o-persistent

Choose the correct answer from the options given below :

i. (A), (B) and (D) Only

ii. (A), (C) and (D) Only

iii. (B), (C) and (D) Only

iv. (A), (B) and (C) Only

UGC NET December 2023

4. Match List – I with List – II.

List – I                                                                   List – II

(A) Monoalphabetic Cipher                     (I) Round key

(B) DES                                                   (II) One-to-many relationship

(C) Stream Cipher                                   (III) One-to-one relationship

(D) Polyalphabetic Cipher                        (IV) Feedback mechanism

Choose the correct answer from the options given below :

i. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

ii. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

iii. (A)-(I), (B)-(III), (C)-(IV), (D)-(II)

iv. (A)-(II), (B)-(I), (C)-(IV), (D)-(III)

UGC NET December 2023

5. Which of the following is not a field in TCP header?

i. Sequence Number

ii. Checksum

iii. Fregmentation offset

iv. Window size

UGC NET December 2023

6. Arrange the following in ascending order :

(A) Remainder of 4916 when divided by 17

(B) Remainder of 2446 when divided by 9

(C) Remainder of 15517 when divided by 17

(D) Last digits of the number 745

Choose the correct answer from the options given below :

i. (A), (B), (C), (D)

ii. (A), (B), (D), (C)

iii. (A), (C), (B), (D)

iv. (D), (C), (B), (A)

UGC NET December 2023

7. Which of the following statement/s are CORRECT ?

(A) NRZ is a bipolar scheme in which the positive voltage define bit is 0 (zero).

(B) NRZ-L and NRZ-I both have an average signal rate of N/2.

(C) The idea of RZ and NRZ-L are combined into Manchester scheme.

(D) NRZ-L and NRZ-I both have DC component problems.

(E) The minimum bandwidth of Manchester and differential Manchester is 3 times that of NRZ.

Choose the correct answer from the options given below :

i. (A), (B) and (C) Only

ii. (A), (C), (D) and (E) Only

iii. (B), (C) and (D) Only

iv. (A), (B), (C) and (E) Only

UGC NET December 2023

8.In “bit stuffing”, each frame begins and ends with a bit pattern in hexadecimal?

i. Ox8C

ii. Ox6F

iii. OxFF

iv. Ox7E

UGC NET December 2023

9. A multiplexes combines for 100 Kbps channels using a time slot of 2 bits. What is the bit rate?

i. 100 Kbps

ii. 200 Kbps

iii. 40 Kbps

iv. 1000 Kbps

UGC NET December 2023

10. Which of the following statement/s is/are NOT CORRECT ?

(A) OSPF is based on distance-vector routing protocol.

(B) Both link-state and distance-vector routing are based on the least cost goal.

(C) BGP4 is based on the path-vector algorithm.

(D) The three-node instability can be avoided using split horizon combined with poison reverse.

(E) RIP is based on link state algorithm.

Choose the correct answer from the options given below:

i. (A), (D) and (E) Only

ii. (A) and (B) Only

iii. (B) and (C) Only

iv. (B), (C) and (E) Only

UGC NET December 2023

11. Given below are two statements:

Statement (I): In datagram networks – routers hold state information about connections

Statement (II): In virtual circuit network- each virtual circuit requires router table space per connection

In the light of the above statements, choose the most appropriate answer from the options given below:

i. Both Statement I and Statement II are correct

ii. Both Statement I and Statement II are incorrect

iii. Statement I is correct but Statement II is incorrect

iv. Statement I is incorrect but Statement II is correct

UGC NET December 2023

12. Arrange the following steps in the correct order for a DHCP Client to renew its IP lease with a DHCP server:

(A) DHCP client sends a DHCPREQUEST message

(B) DHCP server acknowledges the renewal with a DHCPACK message

(C) DHCP client checks the local lease timer and initiates renewal

(D) DHCP server updates its lease database

Choose the correct answer from the options given below:

i. (A), (B), (C), (D)

ii. (C), (D), (Β), (A)

iii. (C), (B), (A), (D)

iv. (C), (A), (B), (D)

UGC NET June 2023

13. IP datagram has arrived with following partial information in the header (in hexadecimal)

45000054000300002006…..

What is the header size?

i. 10 bytes

ii. 20 bytes

iii. 30 bytes

iv. 40 bytes

UGC NET June 2023

14. IP datagram has arrived with following partial information in the header (in hexadecimal) 45000054000300002006….

How many more routers can the packet travel to?

i. 22

ii. 26

iii. 30

iv. 32

UGC NET June 2023

15. IP datagram has arrived with following partial information in the header (in hexadecimal)

45000054000300002006….

What is the protocol of the payload being carried by the packet?

i. ICMP

ii. SCTP

iii. TCP protocol

iv. IGMP

UGC NET June 2023

16. IP datagram has arrived with following partial information in the header (in hexadecimal) 45000054000300002006…

What is the efficiency of this datagram?

i. 76.19%

ii. 80.50%

iii. 82.24%

iv. 85.45%

UGC NET June 2023

17. IP datagram has arrived with following partial information in the header (in hexadecimal) 45000054000300002006….

What is the size of datagram?

i. 64 bytes

ii. 74 bytes

iii. 84 bytes

iv. 104 bytes

UGC NET June 2023

18. Match List I with List II

Choose the correct answer from the options given below:

i. A-III B-II C-I D-IV

ii. A-II B-III C-I D-IV

iii. A-III B-I C-II D-IV

iv. A-II B-IV C-I D-III

Explanation:

A. Physical layer → III Transmission of raw bits over communication channel

B. Data Link Layer → I. Transforming the raw bits in the form of frame for transmission

C. Network layer → II. Control and monitoring of subnet

D. Transport layer → IV. Datagrams transmission data through connection oriented or connectionless using datagram

UGC NET June 2023

19. Match List I with List II

i. A-III B-IV C-II D-I

ii. A-III B-IV C-I D-II

iii. A-II B-III C-IV D-I

iv. A-II B-I C-IV D-III

UGC NET June 2023

20. A TCP server application is programmed to listen on port P on host S. A TCP client is connected to the TCP server over the network, Consider that while TCP connection is active the server is crashed and rebooted. Assume that the client does not use TCP keep alive timer. Which of the following behavior /s is/are possible?

Statement I: The TCP application server on S can listen on P after reboot.

Statement II: If client sends a packet after the server reboot, it will receive the RST segment.

In the light of the above statements, choose the correct answer from the options given below.

i. Both Statement I and Statement II are true

ii. Both Statement I and Statement II are false

iii. Statement I is true but Statement II is false

iv. Statement I is false but Statement II is true