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Networks - A system that allows computer systems to communicate and share…
Networks - A system that allows computer systems to communicate and share resources with each other
Network Hardware, performance
NIC - Network Interface Card
Transmission Media
Ethernet
Fibre optic
Coaxial Cable
Switch
Router
WAP - wireless access point
LAN vs WAN
local area network
small geographical range
strong connection
faster
stronger security
low cost
wide area network
high cost
slower
large geographical range
weaker connection
weaker security
the
internet
Hosting
The cloud
DNS - domain name service
internet
Web servers and clients
Client-server vs Peer-to-Peer
client - A device capable of obtaining information from a server
server - A computer which manages access to a centralised resource
peer - Someone/something of the same status or ability
peer-to-peer
all computers equal status
each device can act as client and sever
all devices connected to each other
cheaper to set up
Client-server
expensive - additional hardware needed for setup
all clients request services from server
relies on a central server
topologies
star
is central switch fails, so does the whole network
easy to add and remove devices
creates a bottleneck on busy networks
few cables
simple to troubleshoot
mesh
allows packets to be routed around bottle necks
no singe point of failure
lots of cabling needed - cost
complicated to add and remove devices
complicated to understand and troubleshoot
wired vs wireless
ethernet
router or switch
network interface card
ethernet cable
pros
physical security
large range
fast transfer speeds
cons
trip hazard
more cables for a new device
immobile
wifi / bluetooth
Bluetooth adapter
Wifi access point, WAP
wireless adapter
wifi
cons
physical obstruction can cause weak signal strength
slower transfer speeds
security
pros
compatible
easy to add new devices
mobile
bluetooth
cons
short range
slow transfer speeds
security
pros
PAN
connections
very low power consumption