L2 Basics: Configuring an EtherChannel

Today we’re going to take a look at how to configure an etherchannel between two Cisco Switches. What is an etherchannel? It’s a way of taking multiple independent links and bundling them together, so that they appear as one logical connection between two devices. Etherchannels are…

What's wrong with VLAN 1?

Earlier this year I was involved in a string of interviews for an open network engineer position. The questions and scenarios provided during the interviews were aimed for someone mid-level. One of the more basic-ish scenario questions I like to ask is the following: Given a brand new switch, can…

Ten years of Cisco Certification

It’s August of 2017 – which means it’s been a long ten years since I originally obtained by CCNA certification in 2007. I figured it might be a good time to take a minute and look at what that has meant for me, and how the…

Odd Behavior of Protected Switchports

I ran into an interesting issue recently, which was caused by use of the switchport protected command…. So I use a pair of Cisco 2960-8TC-L switches at home, for both my home network and lab. A few months back I ran a bunch of ethernet cabling within my house,…

Alright - Now What?

So it’s now been over two months since I finished college and obtained my magical piece of paper. It has been interesting to finally have some free time to do things that I want to do, and not having to constantly balance my time between school and work.…

Port Security: Worth the effort?

Port Security. Always seems like one of those things covered in Cisco exams, yet how many businesses actually use it? For those that aren’t implementing it, should they? Or is it too much of a headache? So the concept of port security is fairly simple – We want…

Virtual Networking Contexts

I really want to take a moment to talk about how wonderful VRFs/firewall contexts really are. Both technologies essentially allow a network administrator to spin up a virtualized, isolated instance of a network device. I’ll be honest and say that I hadn’t had the chance…