Availability
Ensures that information, system , and resources are accessible and operational when needed by authorised users
Why we value the availability as cybersecurity professional
Since it help us with following
1. Ensuring Business Continuity
2. Maintaining Customer Trust
3. Uphold an Organisation’s Reputation
Redundancy
Duplication of critical components or functions of system with the intention of enhancing it’s reliability
Note - to overcome the challenges associated with maintaining availability, the best strategy is to use redundancy in your system and network designs.
Type of redundancy
- Server redundancy
- Data Redundancy
- Network Redundancy
- Power Redundancy
Server Redundancy
Involves using multiple servers in a balanced or failover configuration so that if one is overloaded or fails, the other server can take over the load to continue supporting your end users.
Data Redundancy
Involves storing data in multiple places
Network Redundancy
Ensures that if one network path fails, the data can travel through another route
Power Redundancy
Involves using backup power sources, like generators and ups systems
99% (2nines)
99.9% (3nines)
99.999%(5nines)
2 nines - 3.5 days downtime per year
3 nines - 8.76 hrs downtime per year
5 nines - 5.26 min downtime per year
