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Aspects Of Business Continuity,Proper Use Of Environmental Controls,Disaster Recovery Plans

2.5 Compare and contrast aspects of business continuity

Any business continuity planning preferably include the following:

  • Redundant network connectivity

  • Clusering

  • Fault tolerance using Raid or similar technique

  • Facilities management

Disaster recovery plan is also called as business continuity plan or business process continuity plan. A DRP should include information security, asset security, and financial security plans.

SLA (Short for Service Level Agreement) is the formal negotiated document between two parties. It is a legal document that binds both the parties during the tenure of the agreement.

2.6 Explain the impact and proper use of environmental controls

There are primarily 5 classes of fire:

  • Class 'A' Fire: Involves ordinary combustible materials such as wood, cloth and paper. Most fires are of this class.

  • Class 'B' Fire: Involves flammable liquids or liquid flammable solids such as petrol, paraffin, paints, oils, greases and fat.

  • Class 'C' Fire: Involves gases. Gaseous fires should be extinguished only by isolating the supply. Extinguishing a gas fire before the supply is off may cause an explosion.

  • Class 'D' Fire: Involves burning metals. These should only be dealt with, by using special extinguishers, by personnel trained in the handling of combustible metals.

  • Class 'F' Fire: Involves flammable liquids (Deep Fat Fryers)

There are five types of extinguishers:

  • Water : Water is used with Class A fires.

  • Dry chemical :Regular dry chemical extinguishers have a sodium bicarbonate base and are effective on Class B and C fires.

  • Halon :Halon Extinguishers are best used on Class B or C fires.

  • Carbon dioxide : Carbon Dioxide Extinguishers are used primarily on Class C fires and are also effective on Class B fires.

  • Foam: Foam extinguishers are less commonly used.

2.7 Execute disaster recovery plans and procedures

A properly managed tape backups should include the following:

  • Regular backups according to a pre-determined plan

  • Verifying the backup tapes for integrity

  • Labeling tapes properly for easy and unique identification

  • Storing tapes securely at off-site location

  • Destroying data on old tapes before disposing off the same

There are primarily three types of backups:

  • Full backup : Here all the data gets backed up. It usually involves huge amounts of data for large systems, and may take hours to complete. A full backup is preferred instead of incremental or differential backups where it is feasible. However, when there is large amount of data, full backup is done once in a while and incremental or differential backups are done in between. A backup plan is usually put in place prior to taking backup of data.

  • Differential backup : A differential backup includes all the data that has changed since last full backup. The "differential backup" that was taken earlier (after the "full backup" but before the current "differential backup") becomes redundant. This is because all changed data since last "full backup" gets backed up again.

  • Incremental backup :It includes all the data changed since last incremental backup. Note that for data restoration the full backup and all incremental backup tapes since last full backup are required. The archive bit is set after each incremental backup. Incremental backup is useful for backing up large amounts of data, as it backs up only the changes files since previous incremental backup.

It is recommended to store the backup tapes in a secure, physically distant location. This would take care of unforeseen disasters like natural disasters, fire, or theft. It is also important that the backup tapes are regularly verified for proper recovery in a test server, even though recovery is not really required at that time. Otherwise, it may so happen that you find a backup tape corrupt when it is really required.

2.8 Exemplify the concepts of confidentiality, integrity and availability (CIA)

  • Confidentiality: It is important that only approved individuals are able to access important information. It ensures that only authorized parties can view the information. For example credit card numbers.

  • Integrity: Integrity ensures that the information is correct and no unauthorized person or malicious software has altered the data. In the example of the online purchase, the amount to be transferred should not be altered by any one.

  • Availability: It ensures that data is accessible to authorized users. The total number of items ordered as the result of an online purchase must be made available to an employee in a warehouse so that the correct items can be shipped to the customer

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