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WANs and LANs
Descripción
An incomplete mind map for the Networking topic
Sin etiquetas
netwroking
mind map
revision
computer science
computing
lan
wan
computing
networking
gcse
Mapa Mental por
Josh Watkins
, actualizado hace más de 1 año
Más
Menos
Creado por
Josh Watkins
hace casi 8 años
73
6
0
Resumen del Recurso
WANs and LANs
LANs
Advantages
Enables Digital Communication
Enables Sharing of Information
Enables sharing of peripherals
Enables distributed processing
Multiple computers simultaneosly running the same program
Enables multiple computers to be updated from one central point
Disadvantages
Requires some expertise to install and maintain
Costly
security issues
Viruses
Hackers
Spyware
Hardware Needed
Multiple computers/nodes
All with a Network Interface Card
Data Transfer Media
Wires
Wireless Technology
Hub or Switch
Router
Types of Network
Peer-to-Peer
All nodes have the same status
Data transfer may be slow
Data collisions
Shared process power
Only suitable for low-traffic networks
Client-Server
One computer is the server
This computer needs to be high spec
Large networks may have multiple servers
Clients must sign in so their identification is known
Jobs
To manage traffic on a network
To give security to users
To offer services like software and data to the clients
Topologies
Bus
Cheap
If the main cable breaks the whole network may suffer
Ring
No data collisions
If the main cable breaks the whole network may suffer
Star
Very reliable
Very expensive
WANs
Internet Protocols
Addressing Protocols
Data Transfer Protocols
A group of protocols that underlies the internet
There are many other specific protocols for particular tasks
Every node on a network has an IP
'Internet Protocol' - a unique sequence of four octets
This may not remain the same when it rejoins a network
Each device has a MAC address hardwired into it
'Media Access Control' - 12-digit hexadecimal number
Cannot be changed
Packets
When data is sent across a network it is split into packets
Packet structure
Packet Address
The data is set from router to router until it reaches its destination
Security
Access Levels
Passwords
Encryption
Policies
Acceptable use policies outline how people should behave when using a network
Sanctions/punishments for those who don't use them properly
Disaster Recovery
RAID
backup
Surge protector
reduces likelihood of overloading in the event of a power surge
Back up generator
Security
Failover
Making a system unbreakable
Regular Archiving
By Josh Watkins
Recursos multimedia adjuntos
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