5779238
Description
Mind Map by mattmill98, updated more than 1 year ago
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Created by mattmill98
about 10 years ago
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Unit 3 - Networks and
Communications Part 2
- Servers
- Applications – distributes programmes to computers and
monitors for their use, can also be used to update
programmes when the manufacturer releases updates
- Printer – clients connect to the
print server and download drivers
of the printer, monitors printing
and record who is printing what
and how many copies, allocate
priority to print jobs
- Mail – stores mailboxes of individual users,
sends and receives mail and distributes
messages to the user, can have filters for
obscenity large attachments and viruses
- File – controls the storage, access files
stored in the user area, files stored
centrally on file server, controls access
rights so only authorised people access
particular files, provide a shared area
multiple people can access
- Backup – backing up and restoring files
folders and databases, can be on a schedule,
may have storage attached which does not
have to be in the same physical location
- Proxy – sits between network and the internet,
allows the machine in the network to be anonymous,
acts as a single point for passing requests to and
from the internet, speeds up web access by having a
cache of web pages, has a set of rules
- Firewall Keep a network
secure, two types: software
and hardware, uses a set of
rules to examine the incoming
and outgoing data packets to
see whether they should be
let through or blocked
- Applications – distributes programmes to computers and
monitors for their use, can also be used to update
programmes when the manufacturer releases updates
- Optical Communications
- Fibre-optic Transmission of light
through a transparent cable
- Laser Sending and
receiving a laser beam
- Infrared Used mainly in remote
controls to communicate with a TV,
DVD or video player/recorded
- Fibre-optic Transmission of light
through a transparent cable
- Wireless Communication
- There is no physical connection as data is
transmitted by electro-magnetic waves, line of sight is
not required as devices can communicate from
different locations within a specified distance, smaller
range of frequencies available meaning the available
bandwidth is less, signal attenuated over a distance
which restricts the useable range
- Advantages – no need for physical cables, device can work
anywhere within the range of a WAP, can work through walls as
long as the signal is not too weak, phones can roam the internet
using home network without incurring expensive 3G charges,
sufficient bandwidth for most internet use, Wi-Fi certified
devices are compatible
- Advantages – no need for physical cables, device can work
anywhere within the range of a WAP, can work through walls as
long as the signal is not too weak, phones can roam the internet
using home network without incurring expensive 3G charges,
sufficient bandwidth for most internet use, Wi-Fi certified
devices are compatible
- There is no physical connection as data is
transmitted by electro-magnetic waves, line of sight is
not required as devices can communicate from
different locations within a specified distance, smaller
range of frequencies available meaning the available
bandwidth is less, signal attenuated over a distance
which restricts the useable range
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