UGC NET - Network models: OSI and TCP-IP, switching and routing, IPv4-IPv6, ARP, TCP-UDP, flow and congestion control. Online Test (MCQ Quiz)

1. Which layer of the OSI model is responsible for the physical transmission of data bits over a communication medium?

A) Data Link Layer B) Physical Layer C) Network Layer D) Transport Layer

2. What is the primary function of the Data Link Layer in the OSI model?

A) End-to-end data delivery B) Error detection and correction on the link C) Routing of packets across networks D) Application-specific data formatting

3. Which layer of the OSI model handles logical addressing and routing of packets?

A) Transport Layer B) Session Layer C) Network Layer D) Presentation Layer

4. The Transport Layer in the OSI model is primarily concerned with:

A) Reliable end-to-end data transfer B) Physical medium access control C) Node-to-node delivery D) Network topology management

5. Which OSI layer is responsible for managing sessions between applications?

A) Application Layer B) Presentation Layer C) Transport Layer D) Session Layer

6. The Presentation Layer of the OSI model is primarily concerned with:

A) Network access B) Data encryption and compression C) End-to-end flow control D) Physical signal transmission

7. Which layer of the OSI model provides network services directly to the end-user applications?

A) Presentation Layer B) Session Layer C) Transport Layer D) Application Layer

8. In the TCP/IP model, which layer corresponds to the OSI Physical and Data Link layers?

A) Internet Layer B) Application Layer C) Network Access Layer D) Transport Layer

9. The Internet Layer in the TCP/IP model is equivalent to which OSI layer?

A) Data Link Layer B) Network Layer C) Session Layer D) Physical Layer

10. Which layer in the TCP/IP model provides end-to-end reliable or unreliable data transfer?

A) Network Access Layer B) Internet Layer C) Transport Layer D) Application Layer

11. The Application Layer in the TCP/IP model combines functionalities of which OSI layers?

A) Physical, Data Link, and Network B) Session, Presentation, and Application C) Transport and Network D) Data Link and Transport

12. What type of switching is used in traditional telephone networks where a dedicated path is established for the duration of a call?

A) Packet Switching B) Message Switching C) Circuit Switching D) Cell Switching

13. In packet switching, data is divided into small units called:

A) Frames B) Segments C) Packets D) Datagrams

14. Which switching technique is more efficient for bursty traffic as it does not require a dedicated path?

A) Circuit Switching B) Packet Switching C) Message Switching D) Frequency Division Multiplexing

15. What is the primary goal of routing in a network?

A) To ensure reliable data delivery B) To determine the best path for packets to travel C) To manage network congestion D) To translate physical addresses to logical addresses

16. Which routing method involves each router independently calculating the best path based on its knowledge of the network?

A) Source Routing B) Distance Vector Routing C) Link State Routing D) Flooding

17. Link State Routing protocols, like OSPF, allow routers to:

A) Exchange only their direct neighbor's information B) Have a complete map of the network topology C) Rely on hop count as the sole metric D) Use Bellman-Ford algorithm

18. What is the size of an IPv4 address?

A) 32 bits B) 64 bits C) 128 bits D) 16 bits

19. Which of the following is a valid IPv4 address?

A) 192.168.1.256 B) 2001:0db8:85a3:0000:0000:8a2e:0370:7334 C) 172.16.31.5 D) FF00::1

20. What is the primary motivation for the development of IPv6?

A) Increased speed of data transmission B) Larger address space to overcome IPv4 exhaustion C) Enhanced security features D) Simplified network configuration

21. What is the size of an IPv6 address?

A) 32 bits B) 64 bits C) 128 bits D) 256 bits

22. Which protocol is responsible for mapping an IP address to a physical MAC address on a local network?

A) DHCP B) ARP C) ICMP D) DNS

23. When a host wants to send a packet to another host on the same local network, it uses ARP to find the destination MAC address. What happens if the MAC address is not in the ARP cache?

A) The host sends a DNS query B) The host sends an ARP request broadcast C) The host sends an ICMP echo request D) The host sends a TCP SYN packet

24. Which transport layer protocol provides reliable, ordered, and error-checked delivery of a stream of bytes?

A) UDP B) TCP C) ICMP D) ARP

25. TCP establishes a connection using a process called:

A) Four-way handshake B) Two-way handshake C) Three-way handshake D) Five-way handshake

26. Which transport layer protocol is connectionless and provides faster, but less reliable, data transmission?

A) TCP B) UDP C) HTTP D) FTP

27. UDP is often used for applications like:

A) File Transfer Protocol (FTP) B) Hypertext Transfer Protocol (HTTP) C) Domain Name System (DNS) and streaming media D) Secure Shell (SSH)

28. What is the main purpose of flow control in network communication?

A) To prevent a fast sender from overwhelming a slow receiver B) To ensure packets arrive in the correct order C) To detect and correct errors in transmission D) To route packets efficiently through the network

29. Which mechanism is commonly used by TCP for flow control?

A) Sequence numbers B) Checksums C) Sliding window D) Acknowledge bits

30. What does the sliding window mechanism in TCP allow?

A) The sender to send multiple packets before receiving an acknowledgment B) The receiver to discard duplicate packets C) The network to prioritize certain types of traffic D) The router to choose the shortest path

31. Congestion control in networks aims to:

A) Ensure that a sender does not overwhelm a receiver B) Prevent the network itself from becoming overloaded with too much traffic C) Guarantee delivery of packets D) Reduce the latency of data transmission

32. Which of the following is a common strategy for TCP congestion control?

A) Increasing the sending rate indefinitely B) Reducing the sending rate when packet loss is detected C) Ignoring packet loss and retransmitting indefinitely D) Using a fixed sending rate regardless of network conditions

33. The slow start mechanism in TCP is used to:

A) Gradually increase the sending rate at the beginning of a connection B) Reduce the sending rate when congestion is detected C) Ensure that all packets are delivered reliably D) Manage the flow of data between sender and receiver

34. What is the primary role of the Network Layer?

A) To ensure reliable end-to-end communication B) To handle physical addressing and media access C) To provide logical addressing and routing of packets across networks D) To format data for applications

35. Which protocol operates at the Network Layer and is used for error reporting and diagnostics?

A) TCP B) UDP C) ICMP D) ARP

36. What does a router primarily use to make forwarding decisions?

A) MAC addresses B) IP addresses C) Port numbers D) Physical addresses

37. Which layer is responsible for multiplexing and demultiplexing data from multiple applications onto a single network connection?

A) Network Layer B) Data Link Layer C) Transport Layer D) Session Layer

38. The concept of 'frames' is primarily associated with which OSI layer?

A) Physical Layer B) Network Layer C) Data Link Layer D) Transport Layer

39. Which of the following is a characteristic of UDP?

A) Connection-oriented B) Guaranteed delivery C) Low overhead D) Ordered packet delivery

40. What is the purpose of the Time-To-Live (TTL) field in an IP packet?

A) To indicate the priority of the packet B) To limit the lifespan of a packet in the network to prevent infinite loops C) To specify the maximum transmission speed D) To track the number of hops a packet has taken

41. Which OSI layer is responsible for data formatting, encryption, and compression?

A) Session Layer B) Presentation Layer C) Application Layer D) Transport Layer

42. What is the main difference between switching and routing?

A) Switching operates at the Network Layer, routing at the Data Link Layer. B) Switching forwards frames within a local network, routing forwards packets between networks. C) Switching uses IP addresses, routing uses MAC addresses. D) Switching is connectionless, routing is connection-oriented.

43. Which protocol is used by TCP to inform the sender about received data and acknowledge successful transmission?

A) SYN B) FIN C) ACK D) RST

44. In the context of TCP/IP, which layer is responsible for translating domain names into IP addresses?

A) Transport Layer B) Network Layer C) Application Layer D) Internet Layer

45. What is the purpose of the Address Resolution Protocol (ARP)?

A) To assign IP addresses dynamically B) To resolve a Layer 3 address (IP) to a Layer 2 address (MAC) C) To provide error reporting D) To establish a connection between two hosts

46. Which of the following is NOT a function of the Transport Layer?

A) Port addressing B) Segmentation and reassembly C) Routing D) Flow control

47. What is a 'datagram' in the context of networking?

A) A fixed-size packet used in ATM networks B) A unit of data in connectionless network layer protocols like UDP C) A sequence of packets forming a complete message D) A control packet used for routing updates

48. The 'window size' in TCP refers to:

A) The number of bits used for the sequence number B) The maximum amount of unacknowledged data allowed in transit C) The size of the packet header D) The duration of the connection

49. What is the 'three-way handshake' in TCP primarily for?

A) To transfer data reliably B) To establish a connection and synchronize sequence numbers C) To terminate a connection gracefully D) To negotiate encryption algorithms

50. Which type of routing protocol is characterized by routers advertising their entire routing table to their neighbors?

A) Link State Routing B) Distance Vector Routing C) Path Vector Routing D) Hierarchical Routing

Network models: OSI and TCP-IP, switching and routing, IPv4-IPv6, ARP, TCP-UDP, flow and congestion control. - Online Test

Test Results