IGCSE Computer Science Paper 1 Word Scramble: 2.1 Data Transmission Types and Methods (Modules 121–130)
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Word scramble
Unscramble the letters and write each key term on the line.
1
NRIFTEEDF OEUTRS
Packets from one message can take ______ because each router picks the best available path at that moment, avoiding busy or broken links. Routes may take different lengths of time.
2
ERGOERNDIR ESACPTK
After the last packet arrives, the receiving device uses the packet numbers in the headers to put the packets in the right order and joins the payloads to rebuild the message.
3
ETKCPA GHNTISWCI TPSES
Data is split into numbered packets, routers pick each packet's route, packets may arrive out of order, then they are reordered to rebuild the data once the last packet arrives.
4
LAEISR IISOSNMNSRTA
Sending data one bit at a time, one after another, down a single wire or channel. The bits arrive in the same order they were sent.
5
RLAELPLA IRNNIOATSSSM
Sends several bits at the same time, each down its own wire in the same cable, e.g. 8 bits down 8 wires at once.
6
WKES
Bits sent together down parallel wires arrive at slightly different times, so data can be received incorrectly. It gets worse as the cable gets longer.
7
LSIARE SV AELLLRAP
Serial sends 1 bit at a time down one wire: cheaper, reliable, better over long distance. Parallel sends many bits at once down several wires: faster over short distances only.
Answer Key
IGCSE Computer Science Paper 1 · Modules 121–130
1NRIFTEEDF OEUTRS → different routes — Packets from one message can take different routes because each router picks the best available path at that moment, avoiding busy or broken links. Routes may take different lengths of time.
2ERGOERNDIR ESACPTK → reordering packets — After the last packet arrives, the receiving device uses the packet numbers in the headers to put the packets in the right order and joins the payloads to rebuild the message.
3ETKCPA GHNTISWCI TPSES → packet switching steps — Data is split into numbered packets, routers pick each packet's route, packets may arrive out of order, then they are reordered to rebuild the data once the last packet arrives.
4LAEISR IISOSNMNSRTA → serial transmission — Sending data one bit at a time, one after another, down a single wire or channel. The bits arrive in the same order they were sent.
5RLAELPLA IRNNIOATSSSM → parallel transmission — Sends several bits at the same time, each down its own wire in the same cable, e.g. 8 bits down 8 wires at once.
6WKES → skew — Bits sent together down parallel wires arrive at slightly different times, so data can be received incorrectly. It gets worse as the cable gets longer.
7LSIARE SV AELLLRAP → serial vs parallel — Serial sends 1 bit at a time down one wire: cheaper, reliable, better over long distance. Parallel sends many bits at once down several wires: faster over short distances only.