Online World revision Jan 25 - 4

What is data exchange in the context of computer networks?

• The process of storing data on a local computer

• The passing of data between computers in a network, including the internet

• The encryption of data for security purposes

• The deletion of data from a network

Answer explanation

Data exchange refers to the passing of data between computers in a network, including the internet. This process enables communication and data sharing, distinguishing it from storing, encrypting, or deleting data.

Which transmission mode allows data to be sent in both directions simultaneously?

• Simplex

• Half-duplex

• Duplex

• Single-mode

Answer explanation

The correct answer is Duplex, as it allows data to be sent in both directions simultaneously. In contrast, Simplex allows one-way communication, and Half-duplex allows two-way communication but not at the same time.

What is the primary role of a Coder/Decoder (CODEC) in VoIP communication?

• To encrypt data for secure transmission

• To compress and decompress audio and video files

• To manage network traffic

• To store data on a server

Answer explanation

The primary role of a Coder/Decoder (CODEC) in VoIP communication is to compress and decompress audio and video files, enabling efficient transmission and playback of multimedia content over the network.

Which of the following is a characteristic of fibre optic transmission?

• Uses radio waves for data transmission

• Has a high data transfer rate and is immune to electromagnetic interference

• Limited to short-range communication

• Requires line-of-sight for operation

Answer explanation

Fibre optic transmission is characterized by a high data transfer rate and immunity to electromagnetic interference, making it superior to other methods. The other options do not accurately describe fibre optics.

What is the main advantage of packet switching in data transmission?

• It requires a dedicated communication path

• It allows data to be sent in a continuous stream

• It efficiently uses network resources by sending data in small packets

• It is only suitable for short-distance communication

Answer explanation

The main advantage of packet switching is that it efficiently uses network resources by breaking data into small packets, allowing multiple transmissions over the same network path, unlike dedicated paths or continuous streams.

Which component is essential for a wireless network to connect devices?

• Modem

• Router

• Ethernet cable

• USB hub

Answer explanation

A router is essential for a wireless network as it connects multiple devices to the internet wirelessly, allowing them to communicate with each other and access online resources. The other options do not provide this functionality.

What is the difference between client-side and server-side processing?

• Client-side processing occurs on the server, while server-side processing occurs on the client

• Client-side processing is done on the user's device, while server-side processing is done on the server

• Client-side processing is faster than server-side processing

• Server-side processing is only used for database management

Answer explanation

Client-side processing occurs on the user's device, allowing for faster interactions, while server-side processing happens on the server, handling data and logic. This distinction is crucial for understanding web application architecture.

Which of the following is an example of server-side processing?

• Displaying a rollover image on a web page

• Submitting a completed form on a web page

• Animating a button click

• Validating form input using JavaScript

Answer explanation

Submitting a completed form on a web page involves server-side processing, as it requires the server to handle the data submitted by the user. The other options are client-side actions that do not involve server interaction.

What is the effective range of wireless transmission using infrared?

• Up to 10 feet

• Up to 1 mile

• Up to 100 miles

• Up to 1000 miles

Answer explanation

The effective range of infrared wireless transmission is typically limited to about 10 feet due to its reliance on line-of-sight and susceptibility to obstacles, making 'Up to 10 feet' the correct choice.

Which of the following is a benefit of using fibre optic cables over wire connectors?

• Lower cost

• Higher data transfer rates

• Easier installation

• Greater flexibility

Answer explanation

Fibre optic cables offer higher data transfer rates compared to wire connectors, allowing for faster communication and greater bandwidth, making them ideal for high-speed internet and data transmission.