# IGCSE Information & Communication Technology Paper-1: Specimen Questions with Answers 17 - 17 of 46

## Question 17

Appeared in Year: 2009

### Question

Match List-Ⅰ List-Ⅱ▾

Match the following

 List-Ⅰ List-Ⅱ (A)Ring (i)Each device is connected to every other device on the network through a dedicated point-to-point link. (B)Bus (ii)Each device in the network is connected to a central device called hub. (C)Mesh (iii)Each device is connected with the two devices on either side of it. (D)Star (iv)There is a main cable and all the devices are connected to this main cable.

Choice (4)
• (A)
• (B)
• (C)
• (D)

a.

• (iv)
• (i)
• (ii)
• (iii)

b.

• (i)
• (iii)
• (iv)
• (ii)

c.

• (iii)
• (iv)
• (i)
• (ii)

d.

• (i)
• (iii)
• (ii)
• (iv)

c.

### Explanation

Correct answer is Each device is connected with the two devices on either side of it, Each device in the network is connected to a central device called hub, Each device is connected to every other device on the network through a dedicated point-to-point link, There is a main cable and all the devices are connected to this main cable. Ring, star, mesh and bus are different types of topologies.

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.

• Ring: A ring topology is a bus topology in a closed loop. Data travels around the ring in one direction. When one node sends data to another, the data passes through each intermediate node on the ring until it reaches its destination. The intermediate nodes repeat (re transmit) the data to keep the signal strong. (5) Every node is a peer; there is no hierarchical relationship of clients and servers. If one node is unable to re transmit data, it severs communication between the nodes before and after it in the bus.
• Star: In star topology, every peripheral node (computer workstation or any other peripheral) is connected to a central node called a hub or switch. The hub is the server and the peripherals are the clients. The network does not necessarily have to resemble a star to be classified as a star network, but all of the peripheral nodes on the network must be connected to one central hub. All traffic that traverses the network passes through the central hub, which acts as a signal repeater.
• Mesh: The value of fully meshed networks is proportional to the exponent of the number of subscribers, assuming that communicating groups of any two endpoints, up to and including all the endpoints, is approximated by Reed՚s Law. Mesh is of two type:
• Fully Connected
• Partially Connected
• Bus: In local area networks using bus topology, each node is connected by interface connectors to a single central cable. This is the ‘bus’ , (also referred to as the backbone, or trunk) – all data transmitted between nodes in the network is transmitted over this common transmission medium and is able to be received by all nodes in the network simultaneously.

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