IGCSE - Chapter 2: Data Transmission

a small part of a message/data that is transmitted over a network; after transmission, they are reassembled to form the original message/data

• data packet
• packet switching

• packet header

• checksum

the part of the data packet that contains the IP addresses of the sender and receiver, and includes the packet number which allows reassembly of the data packets

• packet header
• payload

• packet trailer

• error checking

the part of a data packet that indicates the end of the data packet and cyclic redundancy check error check

• packet trailer
• packet header
• data packet
• quantum computer

an error checking method in which all the 1-bits in the data packet payload are added and the total is stored in the packet trailer; the same calculation is repeated at the receiving station

• checksum

• parity check

• echo check

• ARQ

the actual data being carried in a data packet

• payload
• data

• packet trailer
• packet header

packet switching prevents packet loss.

• False

• True

a method of transmission in which a message is broken into many data packets which can then be sent along pathways independently of each other

• packet switching
• circuit switching

• routers

• nodes

a device that enables data packets to be moved between different networks, for example to join a LAN to a WAN

• router
• swtich

• cloud

• computer

the transmission of data over a network for live events where the data is sent as soon as it is received or generated

• real time streaming
• broadcasting

• packet switching
• circuit switching

a number in a data packet header used to stop data packets that never reach their destination from ‘clogging up’ the data paths/routes

• hop number

• route number

• packet serial number

• error code