New CCNA blueprint, with major updates – so we’re creating new editions of the two CCNA Official Cert Guides. They’re due out early 2027. Read here for what we know now here in [...]

Cisco announced CCNA 200-301 Blueprint Version 2.0 on May 20, 2026. If you’re studying for CCNA, of course you want to know: What’s in it? What’s changed? What new topics do I [...]

Barely two years ago (not quite 25 months) Cisco announced CCNA 200-301 V1.1. Today, they announced CCNA 200-301 V2.0, describing it as a major update to the blueprint – which it is. But do [...]

I created two Config Labs that use different methods for clients to lease or learn their IPv6 addresses. The first used stateful DHCPv6, while in this Config Lab, you choose, configure, and [...]

IPv6 supports several methods for clients to build their IPv6 addresses and learn other related settings, such as stateful DHCPv6, SLAAC with stateless DHCPv6, and SLAAC with RDNSS. These methods [...]

As with all the Config Labs with “BIG” in the title, this lab is different than most. This BIG lab collects many of the configuration topics in Volume 1, Part 6 of the CCNA Official [...]

This post is for you regular users of Certskills.com. We just completed a fairly major update of the site! But most of the changes are hidden from you. In this post, I’ll let you know what [...]

I’ve been building a YouTube Channel, @NetworkUpskill, for a couple of years now. I’m working hard to complete a full CCNA course there. I’m abouot 60% complete as of when I [...]

Over at my YouTube channel, I’ve created some labs that exist solely as videos plus a Cisco Packet Tracer .pkt file. The video begins with instructions. Then pause the video, download the [...]

Over at my YouTube channel, I’ve created some labs that exist solely as videos plus a Cisco Packet Tracer .pkt file. The video begins with instructions. Then pause the video, download the [...]

Over at my YouTube channel, I’ve created some labs that exist solely as videos plus a Cisco Packet Tracer .pkt file. The video begins with instructions. Then pause the video, download the [...]

Over at my YouTube channel, I’ve created some labs that exist solely as videos plus a Cisco Packet Tracer .pkt file. The video begins with instructions. Then pause the video, download the [...]

Over at my YouTube channel, I’ve created some labs that exist solely as videos plus a Cisco Packet Tracer .pkt file. The video begins with instructions. Then pause the video, download the [...]

As with all the Config Labs with “BIG” in the title, this lab is different than most. This BIG lab collects many of the configuration topics in Volume 1, Part 5 of the CCNA Official [...]

IP Subnetting includes a variety of math processes that answer specific questions. But how do those processes then apply to building networks? In this BIG exercise, I’ll pull some of those [...]

This lab is different. Instead of a focused lab about one main topic, this one covers several: VLANs, VLAN trunks, Spanning Tree, and EtherChannel. And most CCNA folks will take more than the [...]

Over the years, I’ve created a bundle of about 75 lab exercises here at the blog, called Config Labs. The idea is to read the web page for the lab, then do the lab, and then check your [...]

This post presents questions that ask you to analyze design data about a network and then choose the one subnet mask to use for all subnets. If a company uses one subnet mask for all subnets of [...]

Cisco plans to release start testing based on the CCNA 200-301 Version 1.1 blueprint starting August 20, 2024, replacing the former V1.0 blueprint. Yes, we have new books out mid-year 2024 that [...]

Hi all you regular blog users, I’m sure you know we released new CCNA Official Cert Guides in mid-year 2024. Those books impact this blog because the blog organizes its content to match the [...]

This post asks you to analyze the choice of subnet mask in a network. If a company uses one subnet mask for all subnets of one classful network, you can analyze the address structure as three [...]

This post asks you to analyze the choice of subnet mask in a network. If a company uses one subnet mask for all subnets of one classful network, you can analyze the address structure as three [...]

This post asks you to analyze the choice of subnet mask in a network. If a company uses one subnet mask for all subnets of one classful network, you can analyze the address structure as three [...]

This post asks you to analyze the choice of subnet mask in a network. If a company uses one subnet mask for all subnets of one classful network, you can analyze the address structure as three [...]