Monthly Archives: June 2014

IP Subnetting Part 2: Simple Subnetting Examples

Subnetting is a foundational concept in IP networking. Although it is often misunderstood and even dreaded, this is a simple concept if we could look at things from the perspective of binary. However the combination of binary concepts, IP addressing and subnet masking is … Continue reading

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IP Subnetting Part 1: What is a Subnet?

We cover all sorts of different topics on this site. Today, we are starting a multipart series on subnetting. These concepts are fundamental building blocks for network administrators, engineers and architects. The subnetting topics outlined in this series should be well understood prior … Continue reading

Posted in Career, CCNA, Certification, Network, Technology | Tagged , , , | 7 Comments

Cisco IOS – Understanding IGP Network Statements

One of the things that I find both counterintuitive and often misunderstood is the role of the network command in interior gateway protocols. This command is used in the router configuration mode on Cisco devices. While there are some protocol … Continue reading

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Book Recommendations — Jeff Aiken Series by Mark Russinovich

Last week, I spent a the majority of my commute time listening to a cybercrime novel by Mark Russinovich. This book, Trojan Horse, is the second of three books in the Jeff Aiken Novel series and didn’t disappoint in any … Continue reading

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Reading a Certification Blueprint

Those studying for certification exams should know what they’re studying for. This is typically found on some sort of syllabus or blueprint. In Cisco parlance, we simply call this the exam blueprint. So those taking ICND1 in hopes of achieving … Continue reading

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Interview with David Major, Discussing CLN

During Cisco Live 2014, the Cisco team tracked me down and talked to me about my role and the value of the Cisco Learning Network. Broadcast live streaming video on Ustream Links CLN Forum Link Cisco Learning Network Home

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Who Understands Network Statements?

A couple of weeks ago, I asked some questions about an obscure OSPF configuration. I found the scenario fun to write and share. Therefore, I wanted to offer another odd configuration that might challenge readers to think through the resulting behavior of a … Continue reading

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Classful IP Networks: An Introduction to IP Address Classes

When the concept of subnetting comes up, there is a need to first establish what networks were like before the Internet Standard Subnetting Procedure was introduced in RFC950. Prior to the use of subnet masks, networked devices made assumtions about the network and host … Continue reading

Posted in CCNA, Certification, General, Network, Technology | Tagged , , | 5 Comments

Cisco to Acquire Tail-f Systems: What does it mean?

Earlier today, Cisco Announced their intent to acquire Tail-f Systems for $175 million dollars. Tail-f systems owns two products focusing on Network Device Configuration. The first product is known as NCS, or Network Control System. This product is a comprehensive … Continue reading

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Community Spotlight — Daniel’s Networking Blog

Daniel Dib is a fellow Cisco Learning Network Designated VIP. Daniel is also a Routing and Switching CCIE and an incredibly nice guy.  He regularly shares his thoughts, studies and opinions with the rest of the networking world. In addition … Continue reading

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Streamlining Service Delivery with Technology

Today Uber began offering service in Lexington, Ky. I know a lot of people out there wonder why I’m such a fan of Google’s ride sharing service. The answer to that question is simple. Uber is interesting to me because … Continue reading

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LinkedIn Automation Fail

Like most everyone else, I receive a regular influx of email from LinkedIn. Over time, I’ve noticed that these don’t appear to be vetted by a human, any artificial intelligence or even keyword searches. A week or so ago, I … Continue reading

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