NETWORK TOPOLOGIES

TOPIC: Network Topologies

INFORMATION AND COMMUNICATION TECHNOLOGY (ICT) FOR YEAR NINE (JS 3)

STUDENTS

REGAL COLLEGE, SAGAMU

Main Menu

OBJECTIVE

CONTENT

EXERCISE

SUMMARY

EXIT

At the end of this lesson, student should be able to achieve all the three objective below:-

OBJECTIVE

MAIN MENU SUMMARY EXITEXERCISECONTENT

At the end of this lesson, student should be able to achieve all the three objective below:-

Explain meaning of network topology with correctly.

State three types of network topologies correctly.

Differentiate correctly between the three types of network topology.

CONTENT

MAIN MENU SUMMARY EXITEXERCISEOBJECTIVE

Definition of Network Topology

Types of Network Topology

Differentiation Between theTypes of Network Topology

DEFINITION

What is a Topology ?

This refers to the structural architecture or arrangement of cables, computers and other

peripherals devices in network.


TYPES OF NETWORK TOPOLOGY

Three commonly used network topologies are:-

Bus network.

Ring network.

Star network.


BUS TOPOLOGY

All computers and devices are connected to central cable or bus.

It consists of a main run of cable with a terminator at each end.

They are popular on LANs because they are not expensive and easy to install.


BUS TOPOLOGY


BUS TOPOLOGY


RING TOPOLOGY

Cable forms closed ring or loop, with all computers and devices arranged along the ring.

Data travels from device to device around entire ring, in one direction.

Primarily is used for LANs, but also is used in WANs.


RING TOPOLOGY


STAR TOPOLOGY

All devices connect to acentral device, calledHub or switch.

All data transferredfrom one computer toanother pass through the Hub or switch.


STAR TOPOLOGY


STAR TOPOLOGY


DIFFERENTIATION BETWEEN THE THREE TYPES OF NETWORK TOPOLOGY


WHAT ARE THE DIFFERENCES BETWEEN THE THREE OF NETWORK TOPOLOGY?

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ADVANTAGE DISADVANTAGE

1) Easy to connect computer or peripheral to a linear bus.

1) Entire network shuts down if there is a break in the main cable.

2) Requires less cable length than a star topology.

2) Terminators are required at both ends of the backbone cable.

3) Failure of one computer does not affect the rest of the network.

3) Difficult to identify the problem if the entire network shuts down.

4) Requires no hub or switch 4) It is increasingly becoming outdated

BUS




1) Data is quickly transferred without a ‘bottle neck’.

1) Data packets must pass through every computer

between the sender and recipient therefore, this makes it slower.

2) The transmission of data is relatively simple as packets travel in one direction only.

2) If there is a fault in the wiring between two computers then the

whole network will fail. 3) It is possible to create very large networks using ring topology.

3) It is difficult to troubleshoot the ring.

RING




1) Easy to install and expand. 1) Requires more cable length

than a linear topology.

2) Security can be implemented in the hub/switch.

2) If the hub or concentrator fails, nodes attached are disabled.

3) Easy to detect faults and to remove parts.

3) More expensive than linear bus topologies because of the

cost of the concentrators.

STAR

EXERCISE

MAIN MENU SUMMARY EXITCONTENTOBJECTIVE

1) Which of the following statements describes network topology correctly ?

A. Devices attached or detached at any point on the network.

B. The failure of device on the network.

C. The structural architecture or arrangement

of cables, computers and other peripherals

devices in network.

D. All of the above.

EXERCISE


2) On a __________, all of the computers and devices (nodes) on the network are connected to a central device.

A. Bus network.B. Ring network.C. Star network.D. All of above.

EXERCISE


3) On a star network, the central device that provides a common connection

point for computers and devices on the network is called the __________.

A. Hub/Switch.B. Personal computer.C. Printer.D. File server.

EXERCISE


4) On a bus network, such as that illustrated in the accompanying figure, if one node fails ________.

A. Only that node is affected.B. Only the nodes before that node are affected.C. Only the nodes after that node are affected.D. All the nodes are affected.

EXERCISE


The transmission of data is relatively simple as packets travel in one direction only.

5) The statement above correctly refers to the ______.

A. Bus network.B. Ring network.C. Star network.D. All of the above.

EXERCISE


6) All the statements are true about ring topology except _____________

A. Data is quickly transferred without a ‘bottle neck’.

B. The transmission of data is relatively simple as packets travel in one direction only.

C. If any of the nodes fail then the ring is broken and data cannot be transmitted successfully.

D. Security can be implemented in the hub/switch.

EXERCISE


7) Which of the following statements is true about star topology?

A. Difficult to identify the problem if the entire network shuts down.B. Terminators are required at both ends of the backbone cable. C. The transmission of data is relatively simple as packets travel in one direction only. D. Easy to detect faults and to remove parts.

ANSWER


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QUESTION 1

QUESTION 2

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SUMMARY

MAIN MENU EXERCISE EXITCONTENTOBJECTIVE

BUS TOPOLOGY

DEFINITION• All computers

and devices connected to central cable

DEFINITION• All computers

and devices connected to central cable

ADVANTAGE• Easy to connect a

computer or peripheral to a linear

bus.

ADVANTAGE• Easy to connect a

computer or peripheral to a linear

bus.

• Requires less cable length than

a star topology.

• Requires less cable length than

a star topology.

DISADVANTAGE

• Entire network shuts down if

there is a break in the main cable.

DISADVANTAGE

• Entire network shuts down if

there is a break in the main cable.

• Terminators are required at both

ends of the backbone cable.

• Terminators are required at both

ends of the backbone cable.

• Difficult to identify the problem

if the entire network shuts down.

• Difficult to identify the problem

if the entire network shuts down.

SUMMARY

RING TOPOLOGY

DEFINITION• Cable forms closed ring or loop, with all

computers and devices

arranged along ring.

DEFINITION• Cable forms closed ring or loop, with all

computers and devices

arranged along ring.

ADVANTAGE• Data is quickly transferred without

a ‘bottle neck’.

ADVANTAGE• Data is quickly transferred without

a ‘bottle neck’.

• The transmission of data is relatively

simple as packets travel in one direction

only.

• The transmission of data is relatively

simple as packets travel in one direction

only.

DISADVANTAGE

• Data packets must pass through every

computer between the sender and recipient therefore, this

makes it slower.

DISADVANTAGE

• Data packets must pass through every

computer between the sender and recipient therefore, this

makes it slower. • If any of the nodes fail

then the ring is broken and data cannot be

transmitted successfully.

• If any of the nodes fail then the ring is broken

and data cannot be transmitted

successfully. • It is difficult to

troubleshoot the ring.

• It is difficult to troubleshoot

the ring.


SUMMARY

DEFINITION• All devices

connect to a central

device, called hub.

DEFINITION• All devices

connect to a central

device, called hub.

ADVANTAGE• Easy to install and

wire.

ADVANTAGE• Easy to install and

wire.

• Security can be implemented

in the hub/switch.

• Security can be implemented

in the hub/switch.

DISADVANTAGE• Requires more cable

length than a linear topology.

DISADVANTAGE• Requires more cable

length than a linear topology.

If the hub or concentrator fails,

nodes attached are disabled.

If the hub or concentrator fails,

nodes attached are disabled.

More expensive than linear bus topologies because of the cost of

the concentrators.

More expensive than linear bus topologies because of the cost of

the concentrators.

STAR TOPOLOGY

• Easy to detect faults and to

remove parts

• Easy to detect faults and to

remove parts


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INFORMATION AND COMMUNICATION

TECHNOLOGY (ICT) FOR YEAR NINE (JS 3) STUDENTS

REGAL COLLEGE, SAGAMU

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NETWORK TOPOLOGIES