UGC NET · PAPER 2
UGC NET Paper 2 Computer Science – Unit 9: Data Communication and Computer Networks PYQ (June 2025)
Q3. Match List I with List II
| List I | List II |
|---|---|
| A. Count to infinity problem | I. Mobile Adhoc Networks |
| B. IEEE 802.16 | II. Distance vector routing |
| C. IEEE 802.15 | III. WiMAX |
| D. AODV protocol | IV. Bluetooth |
- A-II, B-III, C-I, D-IV
- A-II, B-III, C-IV, D-I
- A-II, B-IV, C-III, D-I
- A-IV, B-III, C-I, D-II
Q12. Match List I with List II
| List I | List II |
|---|---|
| A. Digital Signature | I. Asymmetric encryption algorithm. |
| B. Hash Function | II. Confirms authenticity and integrity. |
| C. AES | III. Produces a fixed-size digest. |
| D. RSA | IV. Symmetric encryption algorithm. |
- A-II, B-III, C-I, D-IV
- A-II, B-III, C-IV, D-I
- A-III, B-II, C-I, D-IV
- A-IV, B-II, C-I, D-III
Q15. CB84000D001C001C is the content of a UDP header in hexadecimal format. The source port number is
- 52100
- 13
- 28
- 52000
Q24. In a Stop-and-wait system, the bandwidth of the line is 1 Mbps, and 1 bit takes 30 milliseconds to make a round trip. The bandwidth-delay product is
- 15,000 bits
- 20,000 bits
- 30,000 bits
- 60,000 bits
Q26. Arrange the process of virtualization in cloud environments.
A. Hypervisor installed on physical server
B. Virtual machines created
C. Resources allocated to Virtual machines
D. Virtual machines run isolated workloads
Choose the correct answer from the options given below:
A. Hypervisor installed on physical server
B. Virtual machines created
C. Resources allocated to Virtual machines
D. Virtual machines run isolated workloads
Choose the correct answer from the options given below:
- B, C, A, D
- A, B, C, D
- A, C, B, D
- B, C, D, A
Q38. The packet sent by a node to the source to inform it of congestion is called
- Explicit
- Backpressure
- Choke
- Retransmission
Q39. Which of the following are controlled-access protocols?
A. Reservation
B. Polling
C. TDMA
D. Token Passing
E. CSMA/CA
Choose the correct answer from the options given below:
A. Reservation
B. Polling
C. TDMA
D. Token Passing
E. CSMA/CA
Choose the correct answer from the options given below:
- A and D Only
- A, B and D Only
- C, D and E Only
- A, D and E Only
Q55. Arrange the steps involved when a user enters a URL in a browser and accesses a website.
A. DNS resolution
B. HTTP request sent
C. URL entered in the browser
D. IP address obtained
E. Webpage displayed
Choose the correct answer from the options given below:
A. DNS resolution
B. HTTP request sent
C. URL entered in the browser
D. IP address obtained
E. Webpage displayed
Choose the correct answer from the options given below:
- B, A, C, E, D
- C, B, A, E, D
- B, C, D, A, E
- C, A, D, B, E
Q61. Which of the following is NOT a characteristic of packet switching?
- Data is broken into packets
- Each packet may take a different route
- Requires a dedicated path
- Supports dynamic routing
Q78. Which of the following statements is/are TRUE about encryption techniques?
A. In symmetric key cryptography, the secrecy/protection of the key generating function must be of higher level than the decrypting function.
B. The DES technique works by taking a 64 bit chunk value and 56 bit key over a series of transformations.
C. The Twofish symmetric block algorithm works on variable key length of up to 196 bits over a block of 128 bits.
D. RC4 is the most commonly used stream cipher that encrypts & decrypts a stream of bits/bytes instead of blocks.
Choose the correct answer from the options given below:
A. In symmetric key cryptography, the secrecy/protection of the key generating function must be of higher level than the decrypting function.
B. The DES technique works by taking a 64 bit chunk value and 56 bit key over a series of transformations.
C. The Twofish symmetric block algorithm works on variable key length of up to 196 bits over a block of 128 bits.
D. RC4 is the most commonly used stream cipher that encrypts & decrypts a stream of bits/bytes instead of blocks.
Choose the correct answer from the options given below:
- B, C Only
- A, D Only
- A, C Only
- B, D Only
Q84. Which of the following are examples of data encoding schemes?
A. Non-Return to Zero (NRZ)
B. Manchester Encoding
C. Amplitude Modulation
D. Hamming code
E. Bipolar AMI
Choose the correct answer from the options given below:
A. Non-Return to Zero (NRZ)
B. Manchester Encoding
C. Amplitude Modulation
D. Hamming code
E. Bipolar AMI
Choose the correct answer from the options given below:
- A, C and D Only
- A, B and D Only
- C, D and E Only
- A, B and E Only