UGC NET · PAPER 2
UGC NET Paper 2 Computer Science – Unit 9: Data Communication and Computer Networks PYQ (December 2024)
Q3. Consider the following statements regarding multiple access techniques & identify the CORRECT ones.
A. ALOHA is used for multiple access on a shared medium
B. TDMA uses WALSH TABLES for time slot allocation
C. CSMA/CD was invented for wireless networks
D. CDMA codes are sequences of numbers generated by orthogonal codes
Choose the correct answer from the options given below:
A. ALOHA is used for multiple access on a shared medium
B. TDMA uses WALSH TABLES for time slot allocation
C. CSMA/CD was invented for wireless networks
D. CDMA codes are sequences of numbers generated by orthogonal codes
Choose the correct answer from the options given below:
- A & B only
- B & C only
- C & D only
- A & D only
Q4. Which of the following are key features of Mobile Adhoc Networks (MANETs)?
A. Self-organizing and decentralized.
B. High mobility of nodes.
C. Requires fixed infrastructure for operation.
D. Network topology is dynamic and constantly changing.
E. It requires a central controller to manage network traffic.
Choose the correct answer from the options given below:
A. Self-organizing and decentralized.
B. High mobility of nodes.
C. Requires fixed infrastructure for operation.
D. Network topology is dynamic and constantly changing.
E. It requires a central controller to manage network traffic.
Choose the correct answer from the options given below:
- A, B & E only
- B, C, D & E only
- A, B & D only
- A, B & C only
Q16. Consider a noiseless channel with a bandwidth of 5000 Hz transmitting a signal with two signal levels. The maximum bit rate is
- 2500 bps
- 10000 bps
- 5000 bps
- 20000 bps
Q23. Match List I with List II
| List I | List II |
|---|---|
| A. Internet Message Access Protocol (IMAP) | I. A protocol that allows email clients to retrieve emails from a mail server |
| B. Address Resolution Protocol (ARP) | II. Used for remote login to another computer over a network |
| C. Post Office Protocol (POP) | III. A protocol that maps IP addresses to MAC addresses on a local area network |
| D. TELNET | IV. A protocol that allows accessing email on the server without downloading them |
- A-II, B-I, C-III, D-IV
- A-III, B-IV, C-I, D-II
- A-IV, B-III, C-I, D-II
- A-IV, B-III, C-II, D-I
Q29. A network using CSMA/CD has a bandwidth of 20 Mbps. If the maximum propagation time is 25 μs, what is the minimum size of the frame?
- 500 bits
- 1000 bits
- 1500 bits
- 2000 bits
Q32. Sequence the following stages of the sliding window protocol for flow control.
A. Sender moves the window to the next set of frames.
B. Sender sends a window of frames.
C. Receiver acknowledges the received frames.
D. If acknowledgment is not received, sender retransmits the frame.
Choose the correct answer from the options given below:
A. Sender moves the window to the next set of frames.
B. Sender sends a window of frames.
C. Receiver acknowledges the received frames.
D. If acknowledgment is not received, sender retransmits the frame.
Choose the correct answer from the options given below:
- B, A, C, D
- B, C, D, A
- B, D, C, A
- B, C, A, D
Q52. The primary function of a firewall in network security is
- To monitor network traffic and detect anomalies.
- To create virtual private networks for secure communication.
- To filter incoming and outgoing network traffic based on security rules.
- To encrypt data before transmission.
Q68. Match List I with List II
| List I | List II |
|---|---|
| A. Service Level Agreement | I. The technology that connects and enables communication between physical devices over the Internet. |
| B. Virtualization | II. A development environment provided over the Internet to create and deploy applications. |
| C. Internet of Things | III. Contracts that specify performance standards and services availability. |
| D. Platform as a Service | IV. A method allowing multiple operating systems to run on a single physical server. |
- A-III, B-II, C-I, D-IV
- A-III, B-IV, C-I, D-II
- A-III, B-I, C-IV, D-II
- A-I, B-IV, C-III, D-II
Q70. Choose the correct statements from the following
A. In connection-oriented service, the destination address is to be specified only during the setup.
B. Packet sequencing is not guaranteed in connection-oriented service.
C. Flooding is a method in which every incoming packet is sent out on every outgoing line except the one by which it arrived.
D. The presentation layer performs detection and recovery from errors in the transmitted data.
Choose the correct answer from the options given below:
A. In connection-oriented service, the destination address is to be specified only during the setup.
B. Packet sequencing is not guaranteed in connection-oriented service.
C. Flooding is a method in which every incoming packet is sent out on every outgoing line except the one by which it arrived.
D. The presentation layer performs detection and recovery from errors in the transmitted data.
Choose the correct answer from the options given below:
- A, B & C only
- B, C & D only
- A & C only
- A, C & D only
Q88. Arrange the following steps of the DHCP (Dynamic Host Configuration Protocol) process in the correct sequence.
A. DHCP ACK
B. DHCP DISCOVER
C. DHCP OFFER
D. DHCP REQUEST
E. Client receives IP configuration
Choose the correct answer from the options given below:
A. DHCP ACK
B. DHCP DISCOVER
C. DHCP OFFER
D. DHCP REQUEST
E. Client receives IP configuration
Choose the correct answer from the options given below:
- A, B, C, D, E
- B, C, D, A, E
- C, B, A, E, D
- D, A, E, C, B