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Computer & Network Security & User Support & Training Week 11 COMPUTER PLATFORMS Week 11 Security Dangers Attacks Countermeasures Rights Users Problems Support Training Computer Security Danger! Danger! A variety of situations are dangerous to your computer or network

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computer platforms

Computer & Network Security

&

User Support & Training

Week 11

COMPUTER PLATFORMS

Stuart Cunningham - Computer Platforms - 2003

week 11
Week 11
  • Security
    • Dangers
    • Attacks
    • Countermeasures
      • Rights
  • Users
    • Problems
    • Support
    • Training

Stuart Cunningham - Computer Platforms - 2003

computer security
Computer Security
  • Danger! Danger!
    • A variety of situations are dangerous to your computer or network
    • Standalone systems
      • ‘Walk up’ access
    • Networked computers
      • Access to one system potentially allows access to entire network
      • Propagation of viruses
      • Remote access
    • The Internet
      • Essentially allowing ANYONE onto your computer or network
      • Viruses in email, downloaded by accident
      • Spam, pop-ups

Stuart Cunningham - Computer Platforms - 2003

computer security4
Computer Security
  • Your data is important!
    • For whatever reason
      • Sensitive business data
      • Personal information
        • Financial information
        • Credit Cards
        • Address, telephone number
      • Research data
      • Information about other people
      • etc.
    • Plain invasion of privacy / theft
    • You don’t want someone else getting hold of it!
    • You don’t want someone corrupting your system or monitoring your activities

Stuart Cunningham - Computer Platforms - 2003

computer security5
Computer Security
  • Attacks
    • Someone (or something) doing stuff to your system(s)
      • When they shouldn’t be!
  • 3 things to worry about
    • Crackers / Intruders
      • Technically “hacker” is the wrong term
      • Attempt to break into your system
      • Access your data / steal stuff / exploit your machine
    • Viruses
      • Malicious programs
      • Very infectious
      • Uses the computers resources in some way
    • Worms
      • Self-replicating
      • Not normally malicious
        • Just irritating
      • Uses the computers resources in some way

Stuart Cunningham - Computer Platforms - 2003

security countermeasures
Security Countermeasures
  • Physical
    • Keep machines under lock and key
      • Only give access to those who need it
    • Remove disk drives, access to ports
      • e.g- disable USB access
    • Nail down the machine - literally
  • Non-technical
    • Good, long passwords
      • ‘jL04BM£h&~’ as opposed to ‘fred’
    • Don’t let software save your passwords / details
      • ‘AutoComplete’, ‘Password Manager’, etc.
    • Use an OS / NOS that supports good security
      • Especially when networking
      • E.g.- Windows 2000 / Linux
    • Keep OS up to date with patches/fixes
    • Install anti-virus software
    • Remember to log out

Stuart Cunningham - Computer Platforms - 2003

security countermeasures7
Security Countermeasures
  • Enforce log-on and passwords for all users

Stuart Cunningham - Computer Platforms - 2003

security countermeasures8
Security Countermeasures
  • Firewall
    • Restricts access to networks
    • Filters data packets
  • Intrusion Detection System (IDS)
    • Monitors network traffic for anything sinister
    • Flags unusual behaviour
    • Usually has the ability to block
  • Ports
    • Close all unused ports
    • Do not allow un-needed services
  • Authentication
    • Make sure you know who users are
    • Only allow authorised users access

Stuart Cunningham - Computer Platforms - 2003

security countermeasures9
Security Countermeasures
  • Encryption
    • Locking information by using a password or key
    • Hiding data
    • Secure communications
      • Information in transit can be encrypted
    • Must be decrypted at the other end
  • Security Policies
    • Rules that everyone must adhere to
      • Passwords
      • User names
      • Account / Group restrictions
  • Backup / Disaster Recovery
    • Doesn’t prevent attack
    • Makes recovering easier

Stuart Cunningham - Computer Platforms - 2003

security rights
Security Rights
  • Set access rights and permissions for files, folders and resources
  • Users
    • Have to administer each user
    • Time intensive
  • Groups
    • Organise similar users into groups
      • E.g.- ‘Sales’
    • Administer group rather than user
  • Basic rights:
    • Read, Write, Execute, List
  • In Windows NT, 2000, XP, 2003
    • Done using NTFS
      • ‘New Technology’ File System
  • Also on MacOS, UNIX, Linux and Novell

Stuart Cunningham - Computer Platforms - 2003

security rights11
Security Rights
  • Windows

Stuart Cunningham - Computer Platforms - 2003

security rights12
Security Rights
  • Novell

Stuart Cunningham - Computer Platforms - 2003

computer rights

- rw- r-- r-- user adm 120 Jan 21 mdt.tex

d rw- r-- rwx root root 1024 Feb 6 local

World

Group

Owner

Computer Rights
  • UNIX / Linux / MacOS

User / owner

Group

Stuart Cunningham - Computer Platforms - 2003

to err is human even more so to blame it on the computer
To err is human… (even more so to blame it on the computer)
  • It can only be attributable to human error?!
    • People make mistakes
      • Machines don’t!
    • More and more computer illiterates are using computers!
      • Install bad software
      • Accidentally change config settings
      • Go to dodgy web sites
    • Things break / blow up / melt
  • We must be able to put right these problems…

Stuart Cunningham - Computer Platforms - 2003

methods of support
Methods of support
  • Support staff
    • Required to solve problems
    • Look after systems
      • IT Manager
      • Systems Administrator
      • Technician
    • Can be expensive to hire new staff
    • Provides ‘on-site’ support
  • Training for existing staff
    • Attempt to solve the problem before it occurs
      • Stops staff breaking things
    • Allow staff to be able to solve basic problems
    • Investing in training brings greater return on technology implementation
    • Saves money in the long-term
    • Costs money initially

Stuart Cunningham - Computer Platforms - 2003

methods of support16
Methods of support
  • Support
    • Some form is technical support will be required
    • ‘Insurance’ in case of technical failure
      • Especially with specialist equipment
    • Two main types:
      • On site (in house) support
        • Involves employing one or more person(s)
      • 3rd Party support
        • Service Level Agreements
        • Can take time to solve a problem
  • Maintenance
    • Checks of equipment working order
      • Routine maintenance checks / tasks
    • Upgrading equipment and software
    • Keeping systems performance high
    • Continually updating any ‘live’ services
      • Especially sales & marketing

Stuart Cunningham - Computer Platforms - 2003

week 1117
Week 11
  • Security
    • Dangers
    • Attacks
    • Countermeasures
    • Rights
  • Users
    • Problems
    • Support
    • Training

Stuart Cunningham - Computer Platforms - 2003