June 2007
Intermediate to advanced
600 pages
18h 19m
English
Content preview from Network WarriorBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Disaster Chains
Modern commercial aircraft are some of the most amazingly redundant systems on Earth. When one device fails, another device takes over. When two systems fail, a third can take over with a reduced capacity, and so on. Commercial airplanes even have multiple pilots! Still, these testaments to fail-safe engineering can and do crash. When they do, the crash is usually discovered to have been caused by a series of events. These events, all relatively innocuous in and of themselves, spell disaster when strung together. Such a chain of events is called an accident chain.
Massively redundant networks can suffer from accident chains, too. Considering the impact such compound networking failures can have on a business (not to mention one's paycheck), I like to use the term disaster chains to describe them.
Imagine a network with two Cisco 6509 switches in the core. An outage is planned to upgrade one, then the other. Because they're in a redundant pair, one can be brought down without bringing down the network. The first switch is brought down without incident. But, as I'm working, I manage to get my foot tangled in the power cord of the other 6509, and pull it out of the power supply. Of course, the 6509 AC power supplies allow the power cables to be secured with clamps, but the last engineer to work on the switches forgot to retighten the clamps. Each 6509 has two power supplies, which are connected to different circuits, so pulling one power cord should not be an issue. However, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.