ICT- Networks
- Created by: maddie12345
- Created on: 11-02-16 09:37
View mindmap
- Networks
- Advantages
- Monitor work of individuals
- Email/ communicate
- Don't have to use the same computer
- Programs and data can be shared.
- Control access rights
- Drawbacks
- If the network breaks down everyone will be affected
- Expensive to purchase and maintain
- Special security programs needed to stop access to certain files
- Topology
- Ring
- Not reliant on a server, less cable costs, high transmission speeds as data only travels in one direction.
- If one computer breaks, the network will completely fail.
- Star
- Data travels fast as each workstation is connected to the server. If one breaks, others will work, easy to add workstations
- Expensive cabling
- Bus
- Easy to set up and install, easy to add workstations.
- Slow transmission, performance is slowed when there are more users, If the cable fails, from that point on won't work.
- Ring
- Factors that affect choice
- Cost- initial cost of equipment, training, maintenance.
- Size of company- WAN or LAN, amount of processing required must be considered.
- How will the system be used- How much data storage is needed?, Where will they operate the network?
- Existing Systems- Must fit with any systems and protocols currently in use as well as any peripherals.
- Performance- In terms of reliability, user friendliness, capacity, speed of processing.
- Security- Different companies have different priorities eg. preventing hacking or blocking illicit material
- Types Of Network
- Peer to Peer
- A small number of computers linked together and can communicate with each other, no central server. Less than 15 computers.
- Low set up costs,simple, not dependent on a server.
- Data is harder to find, security and back up are not centralised.
- Client- Server
- Main server controls the network. more than 15 computers.
- Centralised backup, better security, processing is faster.
- Set up costs are high, requires specialist people to manage the system, if the server breaks, the network will fail.
- Peer to Peer
- Disaster Planning
- Reasons for: Minimize disruption, don't want to lose data as this may cause a loss of customers.
- Should include: Back up procedures, costs, personnel, responsibility & training
- Used for when things go wrong, such as: viruses, hardware breaking down, natural disasters, deliberate or accidental damage
- Wifi
- Benefits
- Can set up a LAN at home
- No need for cables
- Work anywhere there is a signal
- Drawbacks
- High power consumption
- Security issues with encryption
- Possible health problems caused by radio waves
- Possible interference
- Limited range may cause weak signal
- Hotspots- cafe's, airports, restaurants
- Access to networks without cabling
- Benefits
- Security
- To reduce security threats, use: firewalls, passwords, encryption & virus checkers
- Log-ins, audit trails & user accounts
- Audit trails- Keeps a record of files accessed and edited, documents printed, pages visited and times logged on or off.
- User accounts- The manager can create certain rights e.g. cannot install software or access certain data.Users can change passwords and manage their files.
- Advantages
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