AQA A Level Computer Science - 4.9
Fundamentals of Communications and
Networking 2024 Exam Study Guide
Asynchronous serial data transmission -
Answer>>Transmission system in which the sender and
receiver have separate clocks which are not kept
synchronised. Instead, the clocks are synchronised
temporarily at the start of a transmission. The arrival of
data cannot be predicted by the receiver. A start bit is
used to signal the arrival of data and to synchronise the
transmitter and receiver temporarily.
Client-server system - Answer>>A system in which
some computers (the clients), request services provided
by other computers, the servers.
Internet - Answer>>A global wide area network that is
formed from the interconnection of many other networks
and that uses the TCP/IP protocol.
Bandwidth - Answer>>For a transmission medium, the
range of signal frequencies it may transmit. (Hz)
Baud rate - Answer>>The rate at which signals on a
wire may change.
Bit rate - Answer>>The number of bits transmitted per
second (bps)
, Communication Protocol - Answer>>A set of agreed
signals, codes and rules to be used for data and
information exchange between computers.
Data transmission - Answer>>Movement of data.
Handshaking - Answer>>The sending and receiving
devices exchange signals to establish that they are each
ready to initiate data transfer.
Parallel data transmission - Answer>>Multiple bits are
sent down several wires simultaneously.
Peer-to-peer network - Answer>>A network that has no
dedicated servers. All computers are of equal status and
can both share resources themselves and use resources
from other computers, ie they are peers.
Router - Answer>>A device that receives packets or
from one host (computer) or router and uses the
destination IP address that they contain to pass them
correctly formatted, to another host (computer) or router.
Serial data transmission - Answer>>Single bits are sent
one after another along a single wire.
Server - Answer>>A computer that provides shared
resources to network users.
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