TRB PG Assistant - Network Devices and VLANs - routers, switches, backbone networks, virtual LANs Online Test (MCQ Quiz)

1. Which network device operates at the Data Link Layer (Layer 2) of the OSI model and is primarily used to connect multiple network segments and filter traffic based on MAC addresses?

A) Router B) Hub C) Switch D) Modem

2. What is the primary function of a router in a network?

A) To connect devices within the same local area network (LAN) B) To forward data packets between different networks based on IP addresses C) To amplify network signals over long distances D) To translate digital signals to analog signals and vice versa

3. A backbone network is best described as:

A) A small, isolated network connecting a few computers B) A high-speed network infrastructure that connects multiple LANs or other backbone networks C) A wireless network used for mobile devices D) A network designed for secure data transmission over the internet

4. What is a Virtual LAN (VLAN)?

A) A physical network segment that connects all devices in an office B) A logical grouping of network devices that are not necessarily on the same physical network segment but can communicate as if they were C) A type of wireless network that covers a large geographical area D) A device that connects a local network to the internet

5. Which OSI layer does a router primarily operate at?

A) Physical Layer (Layer 1) B) Data Link Layer (Layer 2) C) Network Layer (Layer 3) D) Transport Layer (Layer 4)

6. What is the main advantage of using a switch over a hub?

A) A switch broadcasts all traffic to all connected devices, while a hub sends it only to the intended recipient. B) A switch creates collision domains for each port, reducing collisions, while a hub creates a single collision domain for all devices. C) A switch operates at the Network Layer, while a hub operates at the Data Link Layer. D) A switch is less expensive than a hub.

7. Which of the following is a common type of backbone network topology?

A) Ring B) Star C) Bus D) Tree

8. What technology allows a single physical switch to be divided into multiple broadcast domains?

A) Spanning Tree Protocol (STP) B) Virtual LAN (VLAN) C) Ethernet D) IP Addressing

9. How do routers connect different networks?

A) By using MAC addresses to forward frames B) By using IP addresses to forward packets C) By broadcasting data to all connected devices D) By creating a single collision domain

10. What is the purpose of a gateway in networking?

A) To connect devices within the same LAN segment B) To connect two or more different types of networks, often translating protocols C) To manage IP addresses within a network D) To provide wireless connectivity

11. Which device is responsible for learning the MAC addresses of devices connected to its ports?

A) Router B) Hub C) Switch D) Repeater

12. What is a fundamental characteristic of a backbone network?

A) Low bandwidth and high latency B) High bandwidth and low latency C) Limited geographical reach D) Designed for end-user devices

13. VLANs improve network performance by:

A) Increasing the size of broadcast domains B) Reducing broadcast traffic and isolating network segments C) Forcing all traffic to pass through a single router D) Disabling collision detection

14. When a switch receives a frame, it examines the destination MAC address and consults its:

A) Routing table B) ARP cache C) MAC address table (CAM table) D) DNS records

15. Which of the following is NOT a typical function of a router?

A) Routing packets between different IP subnets B) Implementing Access Control Lists (ACLs) C) Learning MAC addresses of directly connected devices D) Assigning IP addresses to devices (often via DHCP)

16. What is a 'core' in a backbone network context?

A) The outermost layer of the network B) The central, high-speed network infrastructure that aggregates traffic from distribution layers C) A device connecting end-user devices D) A wireless access point

17. VLAN tagging, such as IEEE 802.1Q, is used to:

A) Identify the IP address of a device B) Identify which VLAN a frame belongs to when traversing trunk links C) Determine the physical port a device is connected to D) Encrypt network traffic

18. A device that connects multiple LANs and forwards traffic based on IP addresses is a:

A) Hub B) Switch C) Router D) Bridge

19. What is the primary difference between a bridge and a switch?

A) A bridge operates at the Network Layer, while a switch operates at the Data Link Layer. B) A bridge connects only two network segments, while a switch can connect many. C) A bridge uses IP addresses, while a switch uses MAC addresses. D) A bridge creates multiple collision domains, while a switch creates only one.

20. Which of the following best describes a 'distribution layer' in a hierarchical network design?

A) Connects end-user devices directly to the network. B) Aggregates traffic from the access layer and provides policy-based connectivity to the core. C) The central, high-speed backbone of the network. D) Provides external connectivity to the internet.

21. What is the main purpose of configuring a trunk port on a switch?

A) To connect a single end-user device to the network. B) To carry traffic for multiple VLANs between switches or between a switch and a router. C) To provide a dedicated connection for management traffic only. D) To extend the physical range of the network segment.

22. How does a switch handle traffic destined for a device whose MAC address is not yet in its MAC address table?

A) It drops the frame. B) It broadcasts the frame to all ports except the one it arrived on. C) It sends the frame only to the default gateway. D) It queries the ARP cache of the connected router.

23. Which network device is most likely to be used to connect a corporate network to the internet service provider's network?

A) Hub B) Switch C) Router D) Access Point

24. What is the term for a network segment that connects different switches and routers, often carrying traffic for multiple VLANs?

A) Access Link B) Trunk Link C) Edge Link D) Peer Link

25. Which of the following is a benefit of segmenting a large network into smaller VLANs?

A) Increased broadcast domain size B) Reduced security and easier management C) Improved security and reduced broadcast traffic D) Elimination of the need for routers

26. What is the role of a Layer 3 switch?

A) It only forwards traffic based on MAC addresses. B) It can perform routing functions in addition to switching functions, operating at both Layer 2 and Layer 3. C) It connects devices within a single LAN segment and does not route traffic. D) It is primarily used for wireless network management.

27. What is the primary purpose of a 'default gateway' setting on an end-user device?

A) To specify the IP address of the local switch B) To specify the IP address of the router that can forward traffic to other networks C) To define the broadcast address for the local network D) To set the DNS server address

28. In a hierarchical network design, the 'access layer' is primarily responsible for:

A) High-speed traffic aggregation between major network segments. B) Connecting end-user devices to the network and enforcing access policies. C) Interconnecting different geographical locations. D) Providing redundancy and high availability.

29. Which of the following is a common method for implementing VLANs?

A) Assigning unique IP addresses to each port B) Physically separating network cables for each group C) Configuring ports on a switch to belong to specific VLANs D) Using hubs instead of switches

30. What does a router use to make decisions about the best path to forward a packet?

A) MAC Address Table B) ARP Cache C) Routing Table D) VLAN ID

31. A 'collision domain' is an area in a network where:

A) Data packets are guaranteed to arrive without error. B) Data collisions can occur if two devices transmit simultaneously. C) Broadcast traffic is isolated. D) Only one device can transmit at a time.

32. Which network device operates at Layer 1 of the OSI model and simply regenerates and retransmits signals?

A) Router B) Switch C) Hub D) Repeater

33. What is the primary advantage of using a backbone network?

A) To connect individual workstations within a small office B) To provide high-speed connectivity and aggregate traffic from multiple lower-level networks C) To translate protocols between different network types D) To filter traffic based on MAC addresses

34. How are devices within the same VLAN able to communicate directly without a router?

A) They use IP addresses for communication. B) They are treated as being on the same logical broadcast domain, allowing Layer 2 communication. C) They communicate via broadcast frames. D) They rely on the default gateway for all communication.

35. What is the role of the Spanning Tree Protocol (STP)?

A) To assign IP addresses to network devices. B) To prevent loops in switched networks by blocking redundant paths. C) To route traffic between different VLANs. D) To filter network traffic based on port security.

36. Which statement accurately describes a router's function regarding broadcast domains?

A) Routers forward broadcasts to all connected networks. B) Routers act as a boundary for broadcast domains; they do not forward broadcasts by default. C) Routers break up collision domains but not broadcast domains. D) Routers create larger broadcast domains.

37. What is the purpose of a 'trunk' in the context of VLANs?

A) A physical cable connecting two end-user devices. B) A link between switches (or a switch and a router) that carries traffic for multiple VLANs, typically using tagging. C) A single, isolated network segment for a specific group of users. D) A wireless connection for mobile devices.

38. Which of the following is a key advantage of using VLANs for network segmentation?

A) Increased network complexity and difficulty in management. B) Reduced security due to shared broadcast domains. C) Improved performance by reducing broadcast traffic and allowing for granular security policies. D) Elimination of the need for IP addressing within segments.

39. A 'distribution layer' switch typically connects to:

A) End-user devices directly. B) Access layer switches and the core layer. C) Only other distribution layer switches. D) The internet service provider.

40. What happens to a frame on a switch if the destination MAC address is unknown and the source port is not in a specific VLAN?

A) It is sent directly to the router. B) It is flooded to all ports in the same VLAN as the source port. C) It is dropped. D) It is broadcast to all ports on the switch.

41. Which network device is primarily responsible for connecting different IP subnets?

A) Hub B) Switch C) Router D) Access Point

42. What is the term for a network topology where multiple switches are interconnected to form a high-speed network fabric?

A) Bus Topology B) Star Topology C) Mesh Topology D) Backbone Network

43. How does VLAN hopping occur?

A) By configuring ports incorrectly. B) By exploiting vulnerabilities in switch configurations, allowing a device to send traffic to a VLAN it's not supposed to access. C) By using a router to bridge VLANs. D) By disabling the Spanning Tree Protocol.

44. What is the role of a 'core layer' in a network architecture?

A) To provide connectivity for end-user devices. B) To aggregate traffic from the distribution layer and provide high-speed, reliable transport to the rest of the network. C) To manage IP address allocation. D) To implement security policies at the network edge.

45. A switch port configured as an 'access port' is typically assigned to:

A) Multiple VLANs. B) A single VLAN. C) No VLAN. D) All VLANs.

46. What is the primary function of a modem in a network context?

A) To connect multiple devices within a LAN. B) To translate digital signals to analog signals for transmission over phone lines and vice versa. C) To route traffic between different IP networks. D) To filter network traffic based on MAC addresses.

47. Which of the following is a benefit of using a backbone network design?

A) Increased latency and reduced throughput. B) Improved scalability and fault tolerance. C) Simplified network management for small networks. D) Lower cost of implementation.

48. What is the main difference between a Layer 2 switch and a Layer 3 switch?

A) A Layer 2 switch uses IP addresses for forwarding, while a Layer 3 switch uses MAC addresses. B) A Layer 2 switch operates only at the Data Link layer, while a Layer 3 switch can perform routing functions at the Network layer. C) A Layer 2 switch creates multiple broadcast domains, while a Layer 3 switch creates only one. D) A Layer 2 switch is used for WAN connections, while a Layer 3 switch is for LAN connections.

49. How do switches help reduce network congestion compared to hubs?

A) By broadcasting all traffic to every port. B) By creating separate collision domains for each port and forwarding traffic only to the intended destination port. C) By operating at the Network Layer and making routing decisions. D) By ignoring MAC addresses and forwarding frames based on IP addresses.

50. What is the purpose of a 'virtual interface' in the context of VLANs and routing?

A) A physical port on a switch. B) A logical interface on a router or Layer 3 switch that represents a specific VLAN and allows for routing between VLANs. C) A connection to a wireless access point. D) A port dedicated to management traffic.

Network Devices and VLANs - routers, switches, backbone networks, virtual LANs - Online Test

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