Unit 1.3 Alevel WJEC CS

Multiple Choice

What is a network?

• 1 computer
• 2 or more computers connected
• a film
• a server

Multiple Choice

Data travels across networks in

• Nibbles

• Parts

• Bytes

• Packets

Multiple Choice

Which network topology is the most widely used and why?

• Bus, because it is the simplest

• Ring, because it is very secure

• Star, because one break should not affect the rest

• Mesh, because it is the fastest

Multiple Choice

Which of the following best describes the difference between serial and parallel data transmission?

• Serial transmission sends data one bit at a time, while parallel transmission sends multiple bits simultaneously.

• Serial transmission is always faster than parallel transmission.

• Parallel transmission is used for long-distance communication, while serial is for short distances.

• Serial transmission requires more wires than parallel transmission.

Open Ended

Compare and contrast serial and parallel data transmission in terms of speed and reliability.

Multiple Choice

Which of the following statements about modes of data transfer is correct?

• Simplex allows data to travel in both directions at the same time.

• Duplex allows data to travel only in one direction.

• Half-Duplex allows data to travel in both directions, but only one direction at a time.

• Duplex is less efficient than Simplex.

Open Ended

Explain why streaming video is considered time sensitive, while downloading a picture is not.

Multiple Select

Which of the following are methods of error checking in data transmission?

• Echoing Back

• Compression

• Parity

• Check Sum

Multiple Choice

Which of the following is a disadvantage of using echoing back for error checking in data transfer?

• It is not effective at detecting errors

• It requires sending data twice, making it slow

• It cannot check the transfer of data

• It does not need a duplex system

Open Ended

Explain the main problem with using parity for error checking when two mistakes are made in the same byte.

Multiple Select

Which of the following statements about switching in networks is/are correct?

• Data is always sent directly between two communicating machines

• A switch is used to manage data being transmitted on the network

• There is only one possible route between any two nodes

• Packet switching and circuit switching are two methods used to determine how a message is sent

Open Ended

Compare and contrast packet switching and circuit switching in terms of how data packets travel through the network.

Multiple Choice

Which of the following is an advantage of packet switching over circuit switching?

• Packet switching makes optimum use of the network by using multiple routes.

• Packet switching is more expensive than circuit switching.

• Circuit switching is more secure than packet switching.

• Circuit switching is less susceptible to delay.

Open Ended

Explain two advantages of using packet switching instead of circuit switching to send a message between two computers on a network.

Open Ended

Describe how packet switching is used to transmit data from one computer to another computer on a network.

Multiple Select

Which of the following are ways to reduce or handle network collisions?

• Using a switch to make multiple connections at the same time

• Increasing Ethernet traffic to maximize collisions

• Ethernet protocol retransmits packets after a collision with a delay

• Broadcasting all packets to all computers at once

Multiple Choice

What is the main purpose of a network protocol?

• To define a set of rules for devices to communicate with each other

• To increase the speed of the network

• To prevent all network collisions

• To encrypt all data on the network

Open Ended

Why is understanding data transmission important in modern communication networks?

Open Ended

After learning about data transmission and communication networks, what is one area you would like to explore further or still have questions about?

Multiple Choice

What is the difference between serial and parallel data transmission?

• Serial transmission sends data one bit at a time, while parallel transmission sends multiple bits simultaneously.

• Serial transmission is always faster than parallel transmission.

• Parallel transmission is only used for wireless networks.

• Serial transmission requires more wires than parallel transmission.