IGCSE Computer Science Data Transmission 2.1

What is a packet in data transmission?

• A permanent storage unit for data

• A unit of data broken down for transmission

• A device used to send data wirelessly

• A type of network protocol

Which of the following is NOT part of the structure of a packet?

• Packet header

• Payload

• Trailer

• Router

What information is included in the packet header?

• Router address, packet number, processor speed

• Destination address, payload, checksum

• Destination address, packet number, originator’s address

• Payload, trailer, packet size

What is the function of the payload in a data packet?

• It contains the error-checking data

• It contains the actual data being transmitted

• It identifies the source of the packet

• It stores the destination address

Which of the following statements about packet switching is FALSE?

• Packets may take different routes to the destination

• A router controls the route a packet takes

• Packets always arrive in order

• Packets are reordered once all have arrived

What is the role of a router in packet switching?

• To store all packets permanently

• To determine the route a packet takes

• To combine multiple packets into one large packet

• To reorder packets at the destination

What happens if packets arrive out of order in packet switching?

• They are discarded and retransmitted

• They are stored in the router permanently

• They are reordered at the destination

• They are ignored by the receiver

What is the key difference between serial and parallel transmission?

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

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

• Serial transmission is only used in wireless communication, while parallel is used in wired communication

• Serial transmission is slower than parallel transmission in all scenarios

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

• It is faster than parallel transmission over short distances

• It is simpler and cheaper for long-distance communication

• It transmits multiple bits simultaneously, saving time

• It does not require error-checking

What is a disadvantage of parallel data transmission?

• It is slower than serial transmission over short distances

• It is more prone to signal interference over long distances

• It cannot handle large amounts of data

• It does not support full-duplex communication