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.
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
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
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
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
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
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