CompTIA Security+ (SY0-601): Planning for the Worst

An unexpected increase in the amount of voltage provided

A short transient in voltage that can be due to a short circuit, tripped circuit breaker, power outage, or lightning strike

An unexpected decrease in the amount of voltage provided

Occurs when the voltage drops low enough that it typically causes the lights to dim and can cause a computer to shut off

Occurs when there is a total loss of power for a prolonged period

RAID 0 = Disk striping
RAID 1 = Disk mirroring
RAID 5 = Disk striping w/parity
RAID 6 = Disk striping w/double parity
RAID 10 = Stripes two mirrored RAIDs
RAID 0+1 = Mirrors two striped RAIDs

Protects against the loss of the array’s data if a single disk fails (RAID 1 or RAID 5)

Protects against the loss of the array’s data if a single component fails
(RAID 1, RAID 5, RAID 6)

Provides two independent zones with full access to the data (RAID 10)

Two or more servers working together to perform a particular job function

A secondary server can take over the function when the primary one fails

Servers are clustered in order to share resources such as CPU, RAM, and hard disks

Hot Site:
A near duplicate of the original site of the organization that can be up and running within minutes

Warm Site:
A site that has computers, phones, and servers but they might require some configuration before users can start working

Cold Site:
A site that has tables, chairs, bathrooms, and possibly some technical items like phones and network cabling

Each tape is used once per day for two weeks and then the entire set is reused

Three sets of backup tapes are defined as the son (daily), the father (weekly), and the grandfather (monthly)

Three sets of backup tapes (like the grandfather-father-son) that are rotated in a more complex system

Contact Information
Impact Determination
Recovery Plan
Business Continuity Plan (BCP)
Copies of Agreements
Disaster Recovery Exercises
List of Critical Systems and Data

A systematic activity that identifies organizational risks and determines their effect on ongoing, mission critical operations

Business impact analysis is governed by metrics that express system availability

The longest period of time a business can be inoperable without causing irrevocable business failure

Each business process can have its own MTD, such as a range of minutes to hours for critical functions, 24 hours for urgent functions, or up to 7 days for normal functions

MTD sets the upper limit on the recovery time that system and asset owners need to resume operations

Recovery Time Objective:
The duration of time and a service level within which a business process must be restored after a disaster in order to avoid unacceptable consequences associated with a break in continuity.

Work Recovery Time:
The length of time in addition to the RTO of individual systems to perform reintegration and testing of a restored or upgraded system following an event

Recovery Point Objective:
The longest period of time that an organization can tolerate lost data being unrecoverable

Recovery Point Objective (RPO) is focused on how long can you be without your data

Mean Time to Repair:

Measures the average time it takes to repair a network device when it breaks

Mean Time Between Failures:

Measures the average time between failures of a device

Heavy machinery; complete destruction

Round-robin
Each server is selected in turn

Weighted round-robin
Prioritize one server over another

Dynamic round-robin
Monitor server load & distribute to the server with lowest use

Active/active
All servers operating, if one fails, operation continues normally