Correct Option: B. be connected directly to a central network hub Detailed Explanation: In a star network topology, all nodes (which can be computers, printers, or other devices) are connected to a central device, typically referred to as a hub or switch. This central hub acts as a point of communication for all the nodes in the network. Here’s a step-by-step breakdown of why option B is correct:

1. Definition of Star Network:
2. A star network is a type of network topology where each node is connected to a central hub. This means that all data transmitted between nodes must go through this central hub.
3. Function of the Central Hub:
4. The central hub serves as a repeater for data flow. When one node sends data, it goes to the hub, which then forwards it to the intended recipient node. This setup simplifies the management of the network and makes it easier to troubleshoot issues.
5. Advantages of Star Topology:
6. Isolation of Devices: If one connection fails, it does not affect the others. Only the node connected to the failed link is impacted.
7. Easy to Add/Remove Nodes: New nodes can be added or removed without disrupting the network.
8. Centralized Management: Network management and monitoring can be centralized at the hub.
9. Why Other Options Are Incorrect:
10. Option A: be connected directly to adjacent node:
    • This option describes a mesh or ring topology rather than a star topology. In a star network, nodes do not connect directly to each other; they only connect to the central hub.
11. Option C: be connected directly to a common backbone cable:
    • This option describes a bus topology, where all nodes share a single communication line (the backbone). In a star topology, there is no common backbone cable; each node has its own connection to the hub.
12. Option D: possess a token before it can transmit signal to adjacent node:
    • This option refers to a token ring network, where a token is passed around the network to control access to the medium. In a star topology, there is no token; nodes can send data to the hub whenever they need to, without waiting for a token.

Summary of Key Points:

• In a star network, all nodes connect to a central hub, making option B the correct answer.
• The central hub facilitates communication and management of the network.
• Other options describe different network topologies (mesh, bus, and token ring) and are therefore incorrect.

Revision Summary:

• Star Network: All nodes connect to a central hub.
• Central Hub: Acts as a communication point and simplifies network management.
• Advantages: Isolation of devices, easy addition/removal of nodes, centralized management.
• Incorrect Options: A (mesh), C (bus), D (token ring) do not describe star topology.