Network+ Star Physical Topology

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This is a practice Network+ test on the subject of Star Physical topology.

• 1.

Which of the following is an advantage to using star topology networks over using bus or ring topology networks?

• A.

Star topology networks are more scalable.

• B.

Star topology networks are less expensive to install.

• C.

Star topology networks are easier to install.

• D.

Star topology networks are more secure.

A. Star topology networks are more scalable.
Explanation
Star topology networks are more scalable because they allow for easy addition or removal of devices without affecting the rest of the network. In a star topology, each device is connected directly to a central hub, which makes it simple to expand the network by connecting new devices to the hub. This flexibility allows for easy growth and adaptability as the network requirements change over time. In contrast, bus or ring topology networks may require more complex reconfiguration or disruption of the entire network when adding or removing devices.

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• 2.

What would happen if a node in a star-wired Ethernet network failed?

• A.

Performance over the entire network would suffer slightly.

• B.

Only the failed node would be unable to transmit or receive data.

• C.

Data could no longer be transmitted or received at any point in the network.

• D.

The failed node would broadcast errors to the rest of the network.

B. Only the failed node would be unable to transmit or receive data.
Explanation
If a node in a star-wired Ethernet network fails, only that specific node would be unable to transmit or receive data. The rest of the network would continue to function normally. This is because in a star-wired network, each node is connected directly to a central hub or switch, and the failure of one node does not affect the connectivity of the other nodes.

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• 3.

What is the function of a hub in a star-wired network?

• A.

To reduce RF emissions that may result in security breaches.

• B.

To increase available bandwidth by sending multiplexed signals.

• C.

• D.

To repeat signals to all nodes on the segment

D. To repeat signals to all nodes on the segment
Explanation
A hub in a star-wired network functions by repeating signals to all nodes on the segment. This means that when a signal is received by the hub, it is then broadcasted to all connected devices, ensuring that each node receives the signal. This allows for easy communication between devices on the network.

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• 4.

In a network using the star topology, five workstations and a hub would be connected via how many physical cables?

• A.

Three

• B.

Four

• C.

Five

• D.

Six

C. Five
Explanation
In a network using the star topology, each workstation is directly connected to the hub using a separate cable. Since there are five workstations, they would be connected to the hub via five physical cables. Therefore, the correct answer is five.

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• 5.

In which of the following networks would it make the most sense to implement a star topology? (Choose all that apply)

• A.

A home network that connects two computers

• B.

A WAN that connects freelance writers across the nation

• C.

A LAN that connects a dozen computers in an insurance company

• D.

A WAN that connects multiple churches within a city

A. A home network that connects two computers
C. A LAN that connects a dozen computers in an insurance company
Explanation
A star topology is most suitable for a home network that connects two computers because it is simple to set up and provides a centralized control point, making it easy to manage and troubleshoot. Similarly, a LAN that connects a dozen computers in an insurance company would benefit from a star topology as it allows for efficient communication and easy expansion. In both cases, the star topology provides a reliable and scalable network solution.

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• 6.

What would happen to a star network if one of its workgroup hubs failed?

• A.

All nodes connected to that hub would be unable to communicate with nodes on other segments, but they could communicate with each other.

• B.

All nodes connected to that hub would be unable to communicate with nodes on other segments as well as nodes on their own segment.

• C.

Nodes would be able to communicate with the network, as they would automatically connect to an alternate hub on the backbone.

• D.

Communication on the entire LAN would halt.

B. All nodes connected to that hub would be unable to communicate with nodes on other segments as well as nodes on their own segment.
Explanation
If one of the workgroup hubs in a star network fails, all nodes connected to that hub would be unable to communicate with nodes on other segments as well as nodes on their own segment. This is because the failed hub acts as a central point for communication between different segments, and without it, the nodes cannot transmit data to other segments or within their own segment.

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• 7.

What type of terminator is used on a star-wired network?

• A.

20-ohm resistor

• B.

50-ohm resistor

• C.

100-ohm resistor

• D.

Terminators are not used on star-wired networks

D. Terminators are not used on star-wired networks
Explanation
Star-wired networks do not require terminators. In a star-wired network, each device is connected directly to a central hub or switch, creating a point-to-point connection. This eliminates the need for terminators, which are typically used in bus or daisy-chain networks to absorb signals and prevent reflections. In a star-wired network, the central hub or switch handles the signal distribution, making terminators unnecessary.

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