Networks
- Created by: frankie306
- Created on: 27-05-15 21:53
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- Networks(2)
- Hardware
- cables
- UTP - unsheilded twisted pair
- light and flexible
- fibre optic
- long distances
- light waves
- cheaper
- Switches
- connect systems / devices
- can also connect networks
- sends info only to the node
- Router
- receives data
- forwards packets to destination
- direct traffic through large networks
- cables
- Types of network
- Client server
- most common
- computers are set up to handle network functions
- typically high end computers
- enough speed and storage to serve the needs of the connected computers.
- server = physical machine / virtual
- Peer to Peer
- all computers are equal
- each computer is responsible for carrying out network functions
- easy to set up
- harder maintenance
- poor security
- slow due to multitasking
- all computers are equal
- Client server
- Topologies
- layout of the components
- Bus
- attatched by a single line with a terminator at each end
- easy to set up
- cheap
- problem with the line can bring entire network down
- limited distance
- many collisions = slower
- Star
- machines connected to central switch/hub
- robust
- fewer collisions - faster
- needs expertise to maintain
- expensive
- more building work needed
- more hardware needed
- ring
- all nodes connected
- no collisions - one way
- vunerable to malfunctions - data goes through every node
- packet switching
- sending data in packets through different routes
- improved reliability - another route can be found
- Security
- Unauthorised access
- data loss
- data theft
- malware
- backups
- protect against data loss
- archives
- old data no longer in use
- for future purposes or legal reasons
- Failover
- software detects potential disaster and transfers operations to a duplicate system
- disaster recovery
- prevention, backups
- documented plan - what to do in catastrophy
- Authentication
- users are identified by username and password
- Unauthorised access
- Hardware
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