Đề 2 – Bài tập, đề thi trắc nghiệm online Mạng và truyền thông

1. Which of the following is an example of a network protocol operating at the Application Layer?

A. IP

B. TCP

C. HTTP

D. Ethernet

2. What is the purpose of Quality of Service (QoS) in networking?

A. To encrypt network traffic for security.

B. To prioritize certain types of network traffic over others.

C. To increase the overall bandwidth of a network.

D. To simplify network configuration and management.

3. What is the primary function of the Network Layer in the OSI model?

A. Ensuring reliable data transfer between adjacent nodes.

B. Defining the physical and electrical characteristics of the network.

C. Routing data packets across networks.

D. Providing end-to-end communication between applications.

4. What is network latency?

A. The maximum data transfer rate of a network.

B. The delay in data transfer over a network.

C. The total bandwidth available in a network.

D. The physical distance between network devices.

5. What is the purpose of VLANs (Virtual LANs) in networking?

A. To increase network bandwidth.

B. To improve network security and organization by segmenting a network logically.

C. To extend the physical reach of a network.

D. To reduce the cost of network hardware.

6. Which protocol is primarily used for sending emails over the internet?

A. HTTP

B. FTP

C. SMTP

D. TCP

7. Which of the following network topologies offers the highest level of redundancy?

A. Bus topology

B. Star topology

C. Ring topology

D. Mesh topology

8. What is the purpose of a firewall in network security?

A. To increase network speed and bandwidth.

B. To prevent unauthorized access to or from a private network.

C. To translate private IP addresses to public IP addresses.

D. To assign IP addresses dynamically to network devices.

9. What is the function of the ARP (Address Resolution Protocol)?

A. To assign IP addresses to devices dynamically.

B. To translate domain names to IP addresses.

C. To resolve IP addresses to MAC addresses within a local network.

D. To route data packets between different networks.

10. Which of the following is a common type of network attack that floods a server with traffic, making it unavailable to legitimate users?

A. Phishing attack

B. Man-in-the-middle attack

C. Denial-of-Service (DoS) attack

D. SQL injection attack

11. In the context of mobile networks, what is 5G primarily designed to improve compared to 4G?

A. Battery life of mobile devices.

B. Network security and encryption.

C. Data speeds, latency, and network capacity.

D. Coverage area and signal strength.

12. What is the difference between a hub and a switch in a network?

A. A hub is more secure than a switch.

B. A switch operates at the Network Layer, while a hub operates at the Data Link Layer.

C. A switch forwards data only to the intended recipient, while a hub broadcasts data to all connected devices.

D. A hub is faster than a switch in data transmission.

13. Which type of cable is commonly used for high-speed Ethernet networks and is less susceptible to interference?

A. Coaxial cable

B. Twisted pair cable (UTP)

C. Fiber optic cable

D. Shielded twisted pair cable (STP)

14. What is the difference between IPv4 and IPv6?

A. IPv6 is faster than IPv4.

B. IPv6 uses 128-bit addresses, while IPv4 uses 32-bit addresses.

C. IPv4 supports more security features than IPv6.

D. IPv4 is used for local networks, and IPv6 is used for the internet.

15. Which layer of the TCP∕IP model is responsible for error detection and correction, as well as flow control?

A. Application Layer

B. Internet Layer

C. Transport Layer

D. Network Access Layer

16. Which of the following is a characteristic of UDP (User Datagram Protocol)?

A. Connection-oriented and reliable.

B. Connectionless and unreliable.

C. Guarantees packet delivery in order.

D. Provides error correction and flow control.

17. What is the purpose of NAT (Network Address Translation)?

A. To encrypt network traffic.

B. To convert public IP addresses to private IP addresses and vice versa.

C. To route data packets efficiently.

D. To manage network bandwidth allocation.

18. In wireless networking, what does SSID stand for?

A. System Security Identification

B. Service Set Identifier

C. Secure Socket Installation Directory

D. Standard Signal Intensity Descriptor

19. What is the `three-way handshake′ process in TCP?

A. A security protocol for encrypting TCP connections.

B. A method for error correction in TCP data transmission.

C. The process of establishing a connection between a client and a server in TCP.

D. A technique for managing flow control in TCP to prevent network congestion.

20. What is the concept of `network segmentation′ and why is it important?

A. Dividing a network into smaller, physical segments to increase bandwidth.

B. Dividing a network into logical segments (like VLANs) to improve security and performance.

C. Combining multiple networks into a single larger network for easier management.

D. Encrypting network traffic to ensure data confidentiality.

21. What is the purpose of subnetting in IP addressing?

A. To increase the speed of data transmission.

B. To reduce network congestion by dividing a network into smaller networks.

C. To encrypt network traffic for security.

D. To simplify IP address assignment for devices.

22. Which wireless standard operates on the 5 GHz band and typically offers faster speeds and less interference compared to 2.4 GHz?

A. 802.11b

B. 802.11g

C. 802.11n and 802.11ac

D. 802.11a

23. What is the main advantage of using cloud-based network services compared to on-premises infrastructure?

A. Higher level of security and control over data.

B. Lower initial investment and greater scalability and flexibility.

C. Faster network performance and lower latency.

D. Less reliance on internet connectivity.

24. Which technology allows for the transmission of voice and video over IP networks?

A. Bluetooth

B. VoIP (Voice over Internet Protocol)

C. NFC (Near Field Communication)

D. GSM (Global System for Mobile Communications)

25. In the context of network security, what is a VPN (Virtual Private Network)?

A. A hardware device that filters network traffic.

B. A secure, encrypted connection over a public network like the internet.

C. A protocol for faster data transmission.

D. A system for managing network devices remotely.

26. Which of the following best describes the `client-server′ model in networking?

A. All devices on the network have equal capabilities and responsibilities.

B. One central server provides resources and services to multiple client devices.

C. Devices communicate directly with each other without a central server.

D. Data is distributed evenly across all devices on the network.

27. What is the function of a router in a network?

A. To convert digital signals to analog signals.

B. To amplify network signals for longer distances.

C. To forward data packets between networks.

D. To connect devices within the same network segment.

28. What is the role of DNS (Domain Name System) in internet communication?

A. Encrypting web traffic for secure browsing.

B. Translating domain names to IP addresses.

C. Managing network traffic and bandwidth allocation.

D. Assigning IP addresses to devices on a network.

29. What does DHCP (Dynamic Host Configuration Protocol) do in a network?

A. Encrypts network traffic.

B. Assigns IP addresses automatically to devices.

C. Routes data packets across networks.

D. Manages domain names and IP address mappings.

30. What is the role of MAC address in network communication?

A. Logical addressing for routing packets across networks.

B. Physical addressing for identifying devices within a local network.

C. Encryption of data transmitted over the network.

D. Management of network bandwidth allocation.