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I just passed my CCIE recertification exam, so my number will be active for two more years. Like last time, I used the CCIE written test at NetMaster Class ( www.netmasterclass.com ) to help prepare. I'm working back into a technology role through...
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I'm surprised by people who don't understand how they could create routing loops with static routes. These people seem to be really surprised that it happened. Upon investigation, they don't seem to understand dynamic routing and prefer to...
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Some network management systems track reachability by pinging network devices. In fact, at a Networkers a few years ago, the Cisco IT team talked about using 5 second pings to measure network availability (what I prefer to call reachability) in the Cisco...
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"Holy Crap!" exclaimed David from the depths of the cube farm, "We just failed the PCI audit! Check out the email from Tony." Tony is the CIO. David is one of my co-workers, a good friend, and overall smart guy. I turned to my email...
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A few weeks ago, I described SLAs based on device reachabilty or uptime. Today's topic is about SLAs based on network QoS. There are many apps like VoIP and SAP that are intolerant of large variations in network performance characteristics. Even though...
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I've been doing more consulting work and am surprised by the number of organizations that don't use anti-spoofing filters within their networks. An anti-spoofing filter is placed on the input side of a router interface of a user subnet and only...
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I've written before in Subsystem Configuration Policy Check about incorporating operational data with configurations for performing configuration compliance validation. Another example, with a different twist to it, occurred last week while creating...
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It is configuration checking time. Do you know where all your devices are? How do you know that there's not a rogue device lurking in your network? How do you know that the configuration collection mechanism has discovered all the devices in your...
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My prior post about SLAs described calculation methodologies. But what data must be collected for those calculations and what's a useful calculation methodology? A business with high availability requirements may prefer an SLA that measures connectivity...
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Scott Hogg just did a post on his Network World Blog that mentioned SLAs (Service Level Agreements). It is a very timely article for me because I'm working with a customer who wants to define network SLAs. The task becomes one of selecting an appropriate...
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