6.1 Summarize confidentiality, integrity and availability concerns.
📘CompTIA ITF+ (FC0-U61)
Availability Concerns in IT
Availability is about making sure users can access systems, applications, and data when they need them. Even if information is confidential and accurate, it’s useless if it isn’t available when needed. Threats to availability can cause downtime, lost productivity, and business problems. Here are the main types of availability concerns:
1. Denial of Service (DoS)
- What it is: A Denial of Service attack happens when an attacker floods a system or network with traffic, making it unable to handle legitimate requests.
- Impact: Users cannot access websites, applications, or services. Servers may crash or slow down.
- Example in IT: A web server receives thousands of fake requests per second, which prevents real users from logging in or accessing the website.
- Exam Tip: Remember, DoS is all about making a service unavailable intentionally.
2. Power Outage
- What it is: A power outage is when electricity stops supplying your IT systems.
- Impact: Servers, networking devices, and storage can stop running, leading to downtime. Unsaved work or running processes may be lost.
- Example in IT: A data center loses power for 15 minutes, and critical applications go offline.
- Prevention: Organizations often use Uninterruptible Power Supplies (UPS) or backup generators to maintain availability during outages.
3. Hardware Failure
- What it is: Hardware failure occurs when physical IT components like servers, hard drives, or network switches stop working.
- Impact: Services can go offline, and data may become inaccessible.
- Example in IT: A hard drive storing customer records fails, and users cannot access that data until it’s restored from backup.
- Prevention: Use redundant hardware, RAID storage, or failover systems to minimize downtime.
4. Destruction
- What it is: Destruction refers to physical damage to IT systems, either accidental or malicious.
- Impact: Equipment or data may be permanently lost. Services may stop running.
- Example in IT: A server room gets flooded, destroying multiple servers and storage devices.
- Prevention: Use data backups, offsite storage, and disaster recovery plans to recover data and restore services quickly.
5. Service Outage
- What it is: A service outage happens when an IT service becomes temporarily unavailable due to software, network, or system issues.
- Impact: Users cannot access the application, even if the hardware is fine.
- Example in IT: A cloud email service experiences downtime due to a software bug. Employees cannot send or receive emails until the service is restored.
- Prevention: Use service monitoring, high-availability systems, and cloud failover solutions to maintain uptime.
Key Takeaways for the Exam
- Availability = Users being able to access systems and data when needed.
- Threats to availability include:
- Denial of Service: Attack floods systems → unavailable service
- Power Outage: Electricity loss → system downtime
- Hardware Failure: Broken servers, drives, switches → service disruption
- Destruction: Physical damage → data or system loss
- Service Outage: Software/network issues → temporary downtime
- Prevention strategies often include:
- Backup power (UPS, generators)
- Redundant hardware and failover systems
- Regular data backups
- Disaster recovery plans
- Cloud or high-availability setups
