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Detect The 5 Common Threats Of Network Downtime

August 2, 2018

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Network downtime is a costly reality of running a business, and unfortunately, it’s more likely to happen to you than not. If Google, Amazon and the United States Government have dealt with such issues, it’s a safe bet that you’re going to run into them as well.

But, that doesn’t mean there’s nothing you can do about it. The key is to understand what dangers threaten to bring your network to a halt, and then put precautions in place to mitigate the risks of system downtime. 

Identify Potential Causes of Network Downtime

Recognizing and understanding the deterrents to network uptime is as important – if not more important – as your ability to get your network back up and running in the event that it goes down. It’s simply more effective to proactively address potential trouble areas, rather than spend energy and resources trying to resolve preventable problems.

Even so, if you’re able to identify the most frequent issues, you’re better equipped to get your network back up as efficiently as possible. The five most common hazards that lead to network downtime are as follows: 

Improperly Scheduled Downtime

Planned network downtime is a costly necessity, though it's often warranted to install new hardware or software. Depending on when you schedule the network downtime, it may hinder your team's productivity and cost your organization a lot more than it should. Be mindful of when you're scheduling such downtime, to ensure that the time selected limits the cost to your company.

Defective Software

While not the most common threat, defective software stops work just the same. Servers, applications, and databases may become infected with viruses or malware as part of a phishing campaign, rendering the tools your team needs inoperable.

3 Keys to Network Resiliency: A security engineers guide to avoiding network downtime

Failed Hardware

These types of failures often occur when new hardware is recently installed or reached its shelf life. The former circumstances tend to stem from design flaws or manufacturing defects, while the latter is a product of standard wear and tear. There's not much you can do about a product flaw, but regular maintenance helps to extend the life of your hardware and prevent it from failing. 

Human Error

Predictable, the most common hazard to your network (and life in general) is humans themselves. Human error, by far, is the most common culprit of network downtime. Accidentally shutting down the network as well as pulling out the wrong cord are common causes that you're simply unable to plan for; however, overloaded circuits and other network design risks are much more preventable

Mother Nature

There's little getting around earth's natural hazards. Earthquakes, hurricanes, fires and other natural disasters are always a real threat to your network uptime. The key is to have a backup system and plan in place should a natural disaster occur in your area. 

Don't let a lack of understanding and preparation threaten your business' productivity and profitability. Identify the likely causes of network downtime, address their risks, and put plans in place to recover from them as quickly as possible. 

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Heartbeats Packets Inside the Bypass TAP

If the inline security tool goes off-line, the TAP will bypass the tool and automatically keep the link flowing. The Bypass TAP does this by sending heartbeat packets to the inline security tool. As long as the inline security tool is on-line, the heartbeat packets will be returned to the TAP, and the link traffic will continue to flow through the inline security tool.

If the heartbeat packets are not returned to the TAP (indicating that the inline security tool has gone off-line), the TAP will automatically 'bypass' the inline security tool and keep the link traffic flowing. The TAP also removes the heartbeat packets before sending the network traffic back onto the critical link.

While the TAP is in bypass mode, it continues to send heartbeat packets out to the inline security tool so that once the tool is back on-line, it will begin returning the heartbeat packets back to the TAP indicating that the tool is ready to go back to work. The TAP will then direct the network traffic back through the inline security tool along with the heartbeat packets placing the tool back inline.

Some of you may have noticed a flaw in the logic behind this solution!  You say, “What if the TAP should fail because it is also in-line? Then the link will also fail!” The TAP would now be considered a point of failure. That is a good catch – but in our blog on Bypass vs. Failsafe, I explained that if a TAP were to fail or lose power, it must provide failsafe protection to the link it is attached to. So our network TAP will go into Failsafe mode keeping the link flowing.

Glossary

  1. Single point of failure: a risk to an IT network if one part of the system brings down a larger part of the entire system.

  2. Heartbeat packet: a soft detection technology that monitors the health of inline appliances. Read the heartbeat packet blog here.

  3. Critical link: the connection between two or more network devices or appliances that if the connection fails then the network is disrupted.

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