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1708618
Networks and Communications Part A
Description
A-Level A2- ICT (Chapter 3- Networks and Communications) Mind Map on Networks and Communications Part A, created by Callum Douglas on 26/11/2014.
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a2- ict
chapter 3- networks and communications
a-level
Mind Map by
Callum Douglas
, updated more than 1 year ago
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Created by
Callum Douglas
over 9 years ago
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Resource summary
Networks and Communications Part A
Local Area Network
This is in a local area geographically, such as in an office
Workstations with network cards or wireless connectivity
Connected via its own dedicated cables or wireless devices, they are owned by the company
Often has shared peripherals
Wide Area network
This is over a wide area geographically
External communication hardware is needed such as telephone lines, leased lines, mobile phone lines. These are used to connect the computers.
The internet is a WAN; computers are connected via external comm links and the information is shared through the WWW
This offers e-mail, internet and instant messaging
To connect to the internet, ISP's are needed.
Used in large organisations
Universities
ATM's
Large businesses with lots of offices
Virtual Network
These computers in a virtual network communicate as if they were a single LAN without knowing that they are in a bigger network
These computers in the VLAN cannot communicate with the others in the LAN if they are not part of the VLAN
These Virtual Networks can exist across multiple LAN's through a WAN or the internet
Data for virtual networks travelling through cables on a LAN do not affect the data from the LAN or other virtual networks
Connecting a LAN and WAN
Most LAN's are connected to a WAN meaning that those in a LAN can connect to others on a WAN
This is done using a router that connects LAN's to and external communication device such as Mobile lines
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