IGCSE Computer Science Unit 2

Poll

What is the best way send a message?

• WeChat

• iMessage

• WhatsApp

• QQ

• writing a letter

Multiple Choice

Nick wants to send some data(a text message) to Louis

How will the data be sent?

• The Data on Nicks Device will be sent Directly to Louis Device

• The Data on Nicks Device will sent over our local network to Lous Device

• The Data on Nicks Device will Be Broken up into pieces, sent in different ways, and put back together when is reaches Louis

Multiple Choice

What are the 3 Parts of a Data Packet?

• Header, Payload, Truck

• Front, Back, End

• Header, Payoff, Trailer

• Header, Payload, Trailer

Draw

Draw the Data Packet Diagram.

Label the Header, Trailer, and Payload.

Open Ended

What is one Benefit to Data Packet Switching ?

Multiple Choice

What are the three main components of a typical packet?

• Header, Payload, Trailer

• Start, Middle, End

• Top, Center, Bottom

• Begin, Content, Finish

Multiple Choice

Which part of a data packet is responsible for holding the control information?

• Header

• Trailer

• Payload

• Body

Multiple Choice

Fill in the blank: The _______ is used to ensure that all packets can be reassembled correctly once they reach the destination.

• Sender IP Address

• Receiver IP Address

• Sequence number of the packet

• Size of the packet

Multiple Choice

What is the purpose of the 'Size of the packet' in the packet structure?

• To ensure packets are sent in order

• To check if all packets have arrived

• To identify the sender

• To identify the receiver.

Multiple Choice

What are the three main components of a typical packet structure?

• Header, Payload, Trailer

• Start, Middle, End

• Top, Center, Bottom

• First, Second, Third

Multiple Choice

What is the main difference between half duplex and full duplex communication?

• Half duplex allows simultaneous two-way communication, while full duplex does not.

• Full duplex allows simultaneous two-way communication, while half duplex does not.

• Both allow simultaneous two-way communication.

• Neither allows simultaneous two-way communication.

Multiple Choice

In a half duplex communication system, data transmission can occur in ______ direction(s) at a time.

• one

• two

• three

• four

Multiple Choice

Which type of communication is depicted by the ability to send and receive data simultaneously?

• Half duplex

• Full duplex

• Simplex

• None of the above

Draw

Which Type of Data Transmission are being described:

Draw

Which Type of Data Transmission are being described:

Draw

Which Type of Data Transmission are being described:

Draw

Which Type of Data Transmission are being described:

Multiple Choice

Fill in the blank: In _______ transmission mode, data is sent in one direction only.

• A) Simplex

• B) Half-duplex

• C) Full-duplex

Multiple Choice

Which transmission mode allows data to be sent and received simultaneously?

• Simplex

• Half-duplex

• Full-duplex

Multiple Choice

Which of the following is a method of data transmission?

• Serial

• Binary

• Optical

• Quantum

Multiple Choice

In the context of data transmission, what does each channel or wire do in parallel transmission?

• Transmits multiple bits

• Transmits one bit

• Transmits no data

• Transmits data wirelessly

Multiple Choice

Which of the following is an advantage of Serial data transmission?

• Faster data transmission

• Reliable in transmitting data over long distance

• Expensive

• Synchronisation errors

Draw

Which Type of Data Transmission are being described:

Draw

Which Type of Data Transmission are being described:

Multiple Choice

USB is an acronym for Universal Serial Bus. True or False?

• True

• False

Multiple Choice

Fill in the blank: The white wire in a USB cable is used for ______.

• A) Data +

• B) Data -

• C) +5 V

• D) Ground

Multiple Choice

If the device driver software is not available, what does the user need to do?

• Ignore the device

• Download the appropriate driver software

• Restart the computer

• Use a different USB port.

Multiple Choice

How many pins does a USB-C connector have?

• 12

• 24

• 36

• 48

Multiple Choice

USB-C connectors are _______ and thinner than older USB connectors.

• larger

• smaller

• the same size

• heavier

Draw

Give 2 Benefits of Using USB.

Multiple Choice

Parity checking is based on the number of ______ in a byte of data.

• 0-bits

• 1-bits

• 2-bits

• 3-bits

Multiple Choice

What is a parity bit used for in data transmission?

• To check for errors

• To increase speed

• To encrypt data

• To compress data

Multiple Choice

Fill in the blank: Even parity means the byte should contain an ______ number of 1s.

• A) odd

• B) even

Fill in the Blanks

Multiple Choice

Fill in the blank: The checksum is then transmitted with the ______.

• A) block of data

• B) algorithm

• C) error message

• D) checksum value

Multiple Choice

In the checksum process, what happens if the two checksums are the same?

• An error has occurred

• No transmission errors have occurred

• The data is corrupted

• The data is lost.

Multiple Choice

What is the first step in the Echo Check process?

• The sender sends a message.

• The receiver sends a copy back to the sender.

• A comparison is carried out.

• An error is detected.

Multiple Choice

What is the main purpose of the Echo Check in data transmission?

• To encrypt data

• To detect errors

• To speed up transmission

• To compress data

Multiple Choice

What should you do if the remainder is zero when calculating the check digit for an ISBN 13?

• Use this value

• Subtract the remainder from 10

• Multiply by 3

• Add 5