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Networks
Descripción
AS - Level (Component 1) Computing Mapa Mental sobre Networks, creado por Lewis Hunt el 20/05/2016.
Sin etiquetas
computing
component 1
as - level
Mapa Mental por
Lewis Hunt
, actualizado hace más de 1 año
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Creado por
Lewis Hunt
hace más de 8 años
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Resumen del Recurso
Networks
An interconnected set of devices
Each device is called a node
Most computing devices are connected to many networks via the internet
Private networks
Advantages:
The institution controls security
Security issues typically involve who is allowed what privileges
Software is totally under the institution's control
The institution is not reliant on someone else providing reliablility
Disadvantages:
They need specialised staff
A need to make own arrangements about security and backups
Precautions that can be taken against loss of data of functionality include:
Redundancy - duplicate servers and other equpiment
Backup regime
Failover systems - automatic transfer to backup system in the event of a failure
Disaster recovery plan - processes, procedures and personnel responsibilities in the event of a major incident
Hardware:
Network Interface Card/Controller
Receives and sends electrical signals.
Router
Device to connect networks
Receives and forwards data packets
Directs packets to next device. Uses a table or an algorithm to decide the route
MAC addresses
48-bit identifier
Permanently added to a device by the manufacturer
Human readable groups of 6 bytes (octets)
08:01:27:0E:25:B8
Switches
Devices to connect other devices on networks
Use of packet switching to send data to specific destinations making use of hardware addresses
Operate at level 2 or 3 of the OSI model
Hubs
Connect nodes together by broadcasting a signal to all possible destionations
The correct destination will accept the signal
Wireless Access Point
Devices can use wireless to connect to a WiFi network
Can cannot from distances of up to about 100 metres
Transmission Media
Networks use cables to connect the nodes
Copper Conductors
Fairly cheap
Wireless is used for part of the network
Slower than cables and poses security threat
Security Issues
Eavesdropping by intercepting the wireless signals
Reduce risk by
Hiding SSID (service set identification)
Limits usefulness to new users
Encrypition
Most use WPA and WPA2 which use only-once encryption keys
Limiting access
Only allow access to known MAC addresses
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