revision

revision

1. policies

   • backup and restore procedures
     • back up the data regularly
       • a copy of all the users' files
   • archiving
     • data taken off the main system and stored
       • normally stored on a magnetic disk
     • frees up space onto the computer
       • can be loaded back onto the computer if needed
   • disaster recovery
     • replicates the computer system in a short time
       • backing up data regularly
       • duplicate hardware systems being avaliable very quickly
       • back up data being stored on the new hardware
   • failover
     • swapping to the spare/redundant component
       • this is done without the user knowing
       • no files will be lost
       • everyone can use the network and computers as normal
   • acceptable user policy
     • is a policy you sign when you start a new job/school
       • includes only using the netowrk for your work
         • no access to pornography
         • no playing games
         • no entering someone elses accounts
           • hacking

2. security

   • preventive measures
     • passwords and usernames
       • certain criteria to stop hackers guessing passwords
     • access rights
       • allowing people to only access certain files
     • physical security
       • locking doors
     • encryption
       • putting data into code so that only people with the special key can understand what the data says
   • detective measures
     • virus checking software
     • firewall software
       • prevents unauthorised users from accessing the network
     • audit trails
       • security-relevant chronological record
   • corrective measures
     • backup and restore procedures
     • failover
     • disaster recovery procedures

3. topologies

   • bus network
     • a simple cable which conencts all devices together
     • advantages
       • easy to install
       • easily expanded
     • disadvantages
       • if there is a problem with the main cable no computers can access the network
       • data collisions can occur causing data transmissions