Fund of data Communications Module 1
What term is used to describe a topology in which computers act as both clients and servers? -
ANS-Peer-to-peer
What is characteristic of the bandwidth of a bus topology? - ANS-The bandwidth is shared
between all nodes connected to the bus
What type of device is used to implement a star topology? - ANS-Hub / switch / router.
You need operations to continue if one link fails. How many links does it take to connect three
sites? - ANS-Three
In which sub-layer of the OSI model do network adapter cards operate? - ANS-MAC (a Data
Link sublayer).
Which component is responsible for translating the computer's digital signals into electrical or
optical signals that travel on network cable? - ANS-Transceiver.
True or false? The Session Layer is responsible for passing data to the Network Layer at the
lower bound and the Presentation Layer at the upper bound. - ANS-False. The session layer is
between the transport and presentation layers.
Which OSI layer handles the concept of logical addressing? - ANS-Network layer.
At which OSI layer is the concept of a port number introduced? - ANS-Transport layer.
Which two OSI layers define how multiple computers can simultaneously use the network media
without interfering with each other? - ANS-Physical and data link.
What is attenuation? - ANS-The loss of signal strength that occurs as the signal travels through
the media.
True or false? Digital signalling is typified by sending a stream of discrete pulses. - ANS-True -
digital signalling is typified by pulses; analog by a continuously varying wave.
What are multiplexing and de-multiplexing? - ANS-Multiplexing means sending multiple
channels on a circuit at the same time as one complex signal. De-multiplexing is the process of
separating the channels at the receiving end.
What term is used to describe a topology in which computers act as both clients and servers? -
ANS-Peer-to-peer
What is characteristic of the bandwidth of a bus topology? - ANS-The bandwidth is shared
between all nodes connected to the bus
What type of device is used to implement a star topology? - ANS-Hub / switch / router.
You need operations to continue if one link fails. How many links does it take to connect three
sites? - ANS-Three
In which sub-layer of the OSI model do network adapter cards operate? - ANS-MAC (a Data
Link sublayer).
Which component is responsible for translating the computer's digital signals into electrical or
optical signals that travel on network cable? - ANS-Transceiver.
True or false? The Session Layer is responsible for passing data to the Network Layer at the
lower bound and the Presentation Layer at the upper bound. - ANS-False. The session layer is
between the transport and presentation layers.
Which OSI layer handles the concept of logical addressing? - ANS-Network layer.
At which OSI layer is the concept of a port number introduced? - ANS-Transport layer.
Which two OSI layers define how multiple computers can simultaneously use the network media
without interfering with each other? - ANS-Physical and data link.
What is attenuation? - ANS-The loss of signal strength that occurs as the signal travels through
the media.
True or false? Digital signalling is typified by sending a stream of discrete pulses. - ANS-True -
digital signalling is typified by pulses; analog by a continuously varying wave.
What are multiplexing and de-multiplexing? - ANS-Multiplexing means sending multiple
channels on a circuit at the same time as one complex signal. De-multiplexing is the process of
separating the channels at the receiving end.
