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Microwaves: Microwaves travel in straight lines and require line-of-sight communication
between antennas. They are used in satellite links, mobile communication and TV broadcasts.

Transmitter Receiver Transmitter Receiver

Microwaves Microwaves

End Station Relay Station End Station

Infrared waves: Infrared waves are used for
short-range communication and cannot pass
through solid objects. They are commonly used in
TV remotes, wireless mice and security systems. Television Infrared Remote
Radiations

Tick ( ) if you know this.

▶ A transmission medium is the path or channel through which data travels from one
device to another in a network.
▶ Network architecture refers to the design and layout of a computer network.

Hashtag

#Data packets: Data packets are small units of data transmitted over a network.
#Media Access Control (MAC) Address: A MAC address is a unique identifier assigned
to a network interface card (NIC) or network device.

REVISIT

▶ A computer network is a group of computers and other devices connected together to share resources and
information.
▶ A client is a system or device that uses services and resources provided by a server in a network.
▶ Data communication is the process of exchanging data between two devices.
▶ A network protocol is a set of rules that are applicable for a network.
▶ Network architecture refers to the design and layout of a computer network.
▶ Topology describes the physical or logical layout of the network.

18 Computer Science (V5.0)-VIII