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Topic 2: internet and communication technologies Terms in this set (240) Network two or more devices called nodes connected by some type of communications channel Node any device connected to a network server a node designed to act as a central netwR153,42
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Topic 2: internet and communication technologies Terms in this set (240) Network two or more devices called nodes connected by some type of communications channel Node any device connected to a network server a node designed to act as a central netw
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Course
ABC - Accredited Business Communicator
Institution
ABC - Accredited Business Communicator
Topic 2: internet and communication technologies
Terms in this set (240)
Network two or more devices called nodes connected by some type of communications channel
Node any device connected to a network
server a node designed to act as a central network, a computer that provides variou...
Topic 2: internet and communication technologies
Jeremiah
Terms in this set (240)
two or more devices called nodes connected by some type of communications
Network
channel
Node any device connected to a network
a node designed to act as a central network, a computer that provides various
server
resources like network security; hardware, disk and printer access
communications channel the connection between source and destination nodes(transmission medium)
Switch Hardware that connects Nodes in a network using bounded or unbounded media
The delivery of different services through the Internet. These resources include tools
cloud computing
and applications like data storage, servers, databases, networking, and software
consists of 3 parts
-hardware that acts as a source or sender
communication media
-hardware that acts as the destination or receiver
-connection between the source and destination
-most common media cabling in small LANs
Unshielded Twisted Pair (UTP) -several pairs of twisted wires in an outer protective platic layer
-twisting the wires eliminates interference from other wires and devices
-More expensive bulkier type cable
Shielded Twisted Pair(STP) RJ45 -Twiste pairs enclosed in protective foil
-Less affected than UTP nu interference and crosstalk
-Central glass/plastic core surrounded by several layers of protective material
-Cladding is used to surround the core and reflects light back into the core
Fibre Optiv Cable, SC connector
-it transmits light pulses rather than electronic signals, eliminating interference.
-Light bounces off cladding even if cable is bent
When LAN segments in seperate locations are connected by a single fibre optic cable
Fibre optic cabling as a backbone
this because lightning does not affect fibre optic cables
1/9
, 8/3/24, 2:26 AM
UTP:
-inexepensive
-fast transmission rates
-widely used
-can be used in many different types of networkks
STP:
Advanatges of bounded media -Same as UTP however is less affected by interferance
Fibre optic cables:
-more secure
-very faster transmissions
-transmits over long distances
-immune to electromagnetic interference
-immune to lightning and electrical surges
Copper cables:
-Attenuation
+signal loses strength over a distance
-Electromagnetic interfernece
+signals from other sources ca corrupt the signals travelling in them
-Eavesdropping
disadvantages of bounded media +can be intercepted by outsiders
-Crosstalk
+signals in adjacent wires can interfere with one another
Fibre optic cables:
-very expensive
-complex to install
use the air to transmsit radio signals such as Bluetooth, infrated beams, microwaves ,
Wireless networks satelites or lasers
each type of wireless signal uses a different frequency
Microwave Transmissions long distance, can be landbased or satelite
Use the Line of sight method for transmitting data between two attennas and can
Terrestrial Microwave
transmit over ranges of 50km
use satelites to receive and pass on communications
-(GEO) Geostationary- in a fixed position above the earths surface and they rotate at
the same speed as the earth, for TV brodcasts
Satelite transmissions
-(LEO) Low-earth orbit- are much closer to the earths surface.They rotate around the
earth every few hours. better for interactive communications, less delay
Device which receives signals and converts them into a different frequency, boosts
Transponder signals and then sends them to a station on the ground below which must be in the line
of site of a satelite
short distances
Radio waves can travel through walls at a low frequency
distance depends on frequency
Personal Area Network
Low powered, short distance wireless/wired network
PAN
Synchronised data between personal devices
eg:bluetooth or usb
Topic 2: internet and communication technologies
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