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Star Topology

5 minutes 5 Questions

Star topology is a network configuration where all devices are connected to a central device, such as a network switch or hub. The central component acts as a relay for data communication between nodes. Star topology's advantages include easy network expansion and centralized control, which simplifies troubleshooting and maintenance. Additionally, a single device failure does not disrupt the entire network, improving reliability. However, the central device's failure can lead to complete network failure. Furthermore, compared to bus topology, star topology requires more cabling, which may increase costs and installation time.

Guide to Understanding Star Topology

What is Star Topology?
Star topology is one of the network topologies used for connecting different networking nodes. The central node in a star topology could be a computer, a switch or a hub. All other nodes are connected to this central node.

Why is it Important?
Understanding star topology is important as it is commonly used in most modern networks due to its advantages like enhanced performance and easy troubleshooting. Knowledge of star topology also helps in the designing and implementation of a network effectively.

How does it Work?
In a star topology, every node on the network is connected through a central device. This central device is responsible for managing the connectivity among the nodes. If a single node fails or is disconnected, it doesn't affect the rest of the network because individual nodes communicate with the central device, not directly with each other.

Exam Tips: Answering Questions on Star Topology
When answering questions in an exam about star topology, make sure to:
- Understand the basics and functioning of star topology.
- Explain the characteristics of star topology in your answers: centralized nature, way of communication between nodes, etc.
- Include the advantages and disadvantages of using star topology.
- Use diagrams to explain your points, if possible. This helps in visual understanding.
- Consider potential troubleshooting scenarios based on the nature of star topology.

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CompTIA Network+ - Networking Topologies Example Questions

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Question 1

In a newly set-up network using star topology, a user finds that they cannot access the Internet. What is the best solution?

Correct Answer: Check if the connection between the user's device and the switch is functioning properly.

In a network set up with a star topology, all devices are connected to a central device, usually a hub, switch or modem. When a user cannot access the internet, the most likely problem lies in the connection between the user's device and this central switch. Hence the first step to problem solving is to check if the connection between the user's device and the switch is functioning properly. Replacing the user's device may not necessarily solve the issue as the problem might not be with their device. Reconfiguring the entire network is an unnecessary first step when the problem might be with a single connection. Testing the switch's power source isn't the best solution either, as if the switch had no power, no devices in the network would be able to connect to the internet, not just one user.

Question 2

A network administrator is setting up a small office with a star topology. The office has 8 computers that need to be connected. Which of these devices should be used for centralizing connections?

Correct Answer: Switch with at least 9 ports

A star topology requires a central device to manage the network. As there are 8 computers that need to be connected, the correct option is a switch with at least 9 ports. This allows each computer to have a dedicated port, and also leaves one port for uplink or connecting further devices if needed. Using a Hub with 4 ports would not be sufficient because it provides less than the required number of connections. A Router with 2 ports also cannot provide enough connections. Moreover, both routers and hubs do not have the intelligence that a switch has to manage data traffic most effectively. A Switch with only 5 ports is also insufficient due to the number of computers to be connected is more than what it can provide.

Question 3

In a star topology network, one user cannot access the internet despite others experiencing no issues. What should a network technician check?

Correct Answer: Check the wiring and connection of the affected user

In a star topology network, all devices are individually connected to a central point, like the 'star' of the network. If only one user is unable to access the internet, then it's highly likely that the issue lies with their individual connection. Hence, the network technician should check the wiring and connection of the affected user. The other answers are flawed because they would not directly address or potentially even identify the problem at hand; replacing the central switch, rebooting all user devices, or updating the router's firmware would likely be unnecessary actions if only one user is affected. They might also potentially disrupt the network for other users - which is currently functioning properly. Therefore, the first step would be to check the individual connection of the affected user.

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