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Network Topology

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Learning Objectives
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 4 I can identify mesh, bus, star and ring topologies
 4 I can explain the features of a range of network topologies
 4 I can identify advantages and disadvantages of different network topologies

🏁 Learning Objective 16 :- I can identify mesh, bus, star and ring topologies


Network Topologies

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A network is two or more computers (or other electronic devices) that are connected together, usually by cables or Wi-Fi.

Network topology refers to how computers are connected to a network.


Task 1

Complete the following slide in your powerpoint

"Network Topology finder"

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Task 2

Complete the following slide in your powerpoint

"Keyword Definitions."

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🏁 Learning Objective 17 :- I can explain the features of a range of network topologies


Features of network Topologies

Network topology refers to how computers are connected to a network.

There are three main types of network topology: bus, ring and star.

The bus network

In a bus network all the workstations, servers and printers are joined to one cable (the bus). At each end of the cable a terminator is fitted to stop signals reflecting back down the bus.

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The ring network

In a ring network each device (workstation, server, printer) is connected to two other devices, this forms a ring for the signals to travel around. Each packet of data on the network travels in one direction and each device receives each packet in turn until the destination device receives it.

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Advantage

This type of network can transfer data quickly, even if there are a large number of devices connected because the data only flows in one direction, so there won’t be any data collisions.

Disadvantage

If the main cable fails or any device is faulty then the whole network will fail.

The star network

In a star network each device on the network has its own cable that connects to a switch or hub. A hub sends every packet of data to every device, whereas a switch only sends a packet of data to the destination device.

star network

A star network, where devices are connected to a central hub or switch

AdvantagesDisadvantages
very reliable – if one cable or device fails then all the others will continue to workexpensive to install as this type of network uses the most cable (network cable is expensive)
high performing as no data collisions can occurextra hardware [hardware: the physical components of a computer ] required (hubs or switches) which adds to cost
if a hub or switch fails all the devices connected to it will have no network connection

Task 1

Complete the following slide in your powerpoint

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Task 2

Complete the following slide in your powerpoint

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🏁 Learning Objective 18 :- I can identify advantages and disadvantages of different network topologies


Advantages and Disadvantages of Network Topologies

The bus network

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AdvantagesDisadvantages
easy to installif the main cable fails or gets damaged the whole network will fail
cheap to install, as it doesn’t require much cableas more workstations are connected the performance of the network will become slower because of data [data: information without context, eg a list of students with numbers beside their names is data, when it's made clear that those numbers represent their placing in a 100 metre race, the data becomes information ] collisions
every workstation on the network "sees" all of the data on the network – this is a security risk

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The ring network

Advantage

This type of network can transfer data quickly, even if there are a large number of devices connected because the data only flows in one direction, so there won’t be any data collisions.

Disadvantage

If the main cable fails or any device is faulty then the whole network will fail.


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The star network

AdvantagesDisadvantages
very reliable – if one cable or device fails then all the others will continue to workexpensive to install as this type of network uses the most cable (network cable is expensive)
high performing as no data collisions can occurextra hardware [hardware: the physical components of a computer ] required (hubs or switches) which adds to cost
if a hub or switch fails all the devices connected to it will have no network connection

Task 1

Complete the following slide in your powerpoint

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Task 2

Complete the following slide in your powerpoint

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Update your learning objectives

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Teacher Date: 2019-11-18


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