Tag Archives: certification

IP Subnetting Part 5: Subnetting Across the Octet Boundary

Throughout this series, we have examined several fundamental building blocks of subnetting. In IP Subnetting Part 4, we looked at what was required to subnet a Class C network. This article takes the fundamentals one step further and looks at … Continue reading

Posted in CCNA, Certification, General, Network, Technology | Tagged , , , , | 3 Comments

IP Subnetting Part 4: Subnetting a Class C Network

At this point in the PacketU subnetting series, we have worked through the following– What is a Subnet? Simple Subnetting Examples Understanding the Binary This article takes the concept of subnetting to the next step. Today we are going to look at … Continue reading

Posted in CCNA, Certification, General, Network, Technology | Tagged , , , , | 2 Comments

IP Subnetting Part 3: Understanding the Binary

I’ve often stated how simple subnetting really is. While each individual concept is rather simple, it is the combination that make the holistic process challenging. If we, as humans, could look at the process more like computers and network devices, … Continue reading

Posted in CCNA, Certification, General, Network, Technology | Tagged , , , , | 1 Comment

Using Cisco’s DevNet “All-in-One VM” as a Free Router Lab

I know many have been [not so patiently] waiting for the arrival of a Cisco virtual lab. Although I haven’t heard any official release date for VIRL or CML, there is a small scale virtual router lab available today. This lab is … Continue reading

Posted in Blogroll, CCNA, Certification, General, Network, Rant, Technology | Tagged , , , , , | Comments Off on Using Cisco’s DevNet “All-in-One VM” as a Free Router Lab

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

Posted in CCNA, Certification, General, Network, Technology | Tagged , , , , | 4 Comments

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

Posted in CCNA, Certification, Network, Technology | Tagged , , , , | 1 Comment

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

Posted in Certification, General, Network, Technology | Tagged , , | Comments Off on Reading a Certification Blueprint

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

Posted in CCNA, Certification, Network, Technology | Tagged , , | 1 Comment

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

Validating Candidate Knowledge

I’ve been thinking a lot about the process of knowledge validation. One of the things that frustrates me is the process asking obscure questions that depend on memorization of pointless trivia. This may occur either in the vendor testing or … Continue reading

Posted in Career, Certification, General, Technology | Tagged , , | 14 Comments

My #FAIL at #CLUS and Cisco Testing RANT

I’m about to publicly humiliate myself by sharing today’s private humiliation. To make a long story short, I took 640-554 (CCNA Security) and got the “We Regret to Inform you, blah, blah, blah…” Actually after I’d seen the first 10 questions … Continue reading

Posted in CCNA Security, Certification, Cisco Live, Events, Security, Technology | Tagged , , , , | 4 Comments