# IGCSE Information & Communication Technology Paper-1: Specimen Questions with Answers 4 - 5 of 46

## Question 4

Appeared in Year: 2009

### Describe in Detail

Essay▾

A floor turtle can use the following instructions:

 Instruction Meaning PENUP Lift the pen PENDOWN Lower the pen LEFT t Turn left t degrees RIGHT t Turn right t degrees FORWARD n Move n mm forward BACKWARD n Move n mm backward

Write the set of instructions to draw this shape?

• PENDOWN
• LEFT 90

• FORWARD 20

• RIGHT 90

• FORWARD 60

• RIGHT 90

• FORWARD 120

• RIGHT 90

• FORWARD 60

• RIGHT 90

• FORWARD 70

• LEFT 90

## Question 5

Appeared in Year: 2009

### Question

MCQ▾

Choose the correct topology names for the following images?

### Choices

Choice (4)

a.

A-Star topology, B- Mesh topology, C- Hybrid topology

b.

A-Mesh topology, B-Hybrid topology, C- Ring topology

c.

A-Bus topology, B- Hybrid topology, C- Star topology

d.

A-Ring topology, B- Star topology, C- Mesh topology

d.

### Explanation

• The geometric representation of how the computers are connected to each other is known as topology. There are five types of topology – Mesh, Star, Bus, Ring and Hybrid.
• Bus topology: The image shown in A represent bus topology. In bus topology there is a central cable called backbone to which all the devices are connected. Here data transmits only in one direction. And in comparison with other networks cable required is least for bus topology.

• Star topology: The image shown in B represent Star topology. In star topology all the devise are connected to a single hub through a cable. This hub is the central node and all the other nodes are connected to this central node. Every node will have its own dedicated connection to the hub. Hub acts as a repeater for dataflow.

• Mesh topology: The image shown in C represents mesh topology. In mesh topology each device is connected to other device through a dedicated point to point link. All the devices/nodes in the network are connected to each other. Mesh has physical channels to link n devices. In mesh topology data can be transmitted using two techniques

• Routing

• Flooding