Redundant design

Let's consider how to make our network more redundant in this video. The big goal that a lot of network designers have is called the five nines of availability. That means that we're up 99.999 percent of the time. And if you do the math, that translates to only about five minutes of downtime per year. However, if we do want to achieve that level of redundancy, we have to realize it's probably going to increase costs because we're going to have redundant components, we're going to have redundant power, maybe with a UPS, maybe with a generator, we might have redundant routers to give our end devices more than one gateway that they could use to get out to the rest of the world, using a first-hop redundancy protocol that we'll discuss in our next video. But those are the types of things that we have to consider if we want a redundant design. And you need to decide, is the increased cost justified by an incremental improvement in uptime? And if we do decide that we want to have a fault…