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IPv6: Are We There Yet?

White Paper | April 09, 2015

The first big push toward implementation of IPv6 was mobile devices. Now, one of the driving forces is the Internet of Things. As the name implies, this means everything, including machine to machine communication (M2M).

The Internet of Things: A Primer for the Curious

White Paper | April 08, 2015

Like it or not, Internet of Things (IoT) is upon us. There are a number of factors that will impact its adoption rate, and the inevitable privacy (or lack of) discussions will likely happen sooner than later. This is going to change the world as we know it, in many cases for the better. But we will need to keep an eye on the extent to which it invades our personal lives if it is going to be the positive force it has the potential to be.

Binary and IP Address Basics of Subnetting

White Paper | Aug. 07, 2014

The process of learning how to subnet IP addresses begins with understanding binary numbers and decimal conversions along with the basic structure of IPv4 addresses. This paper focuses on the mathematics of binary numbering and IP address structure.

Which Exams to Take: CCNA Composite vs ICND1 and ICND2

Video | Feb. 25, 2014

Global Knowledge instructor Kevin Schweers reviews the basic differences between the two paths to achieving CCNA certification.

Subnetting Made Easy - Part 1

Video | Nov. 14, 2013

Instructor John Harmon explains subnetting using binary numbers and decimal conversions.

Subnetting Made Easy - Part 2

Video | Oct. 10, 2013

Instructor John Harmon continues his explanation of subnetting by showing how subnet masks can be used to sub-divide networks.

Benefits of Global Knowledge's CCNA Boot Camp

Video | March 21, 2013

Diane Teare, Global Knowledge's Cisco Course Director, discusses the advantages to taking our CCNA Boot Camp.

Spanning Tree Overview

Video | March 13, 2013

Global Knowledge instructor Kevin Schweers reviews the fundamentals of spanning tree, including the three primary steps.

What Happens If I Have More Than One Switch With Redundant Links?

Article | Oct. 11, 2012

That depends on their configurations. For example: While it makes very good sense to include redundant physical links in a network, connecting switches in loops, without taking the appropriate measures, will cause havoc on a network. Without the correct measures, a switch floods broadcast frames out all of its ports, causing serious problems for the network devices. The main problem is a broadcast storm where broadcast frames are flooded through every switch until all available bandwidth is used and all network devices have more inbound frames than they can process.

What is the Difference Between Bridges, Hubs, and Switches?

Article | Aug. 14, 2012

The most obvious difference is that hubs operate at Layer 1 of the OSI model while bridges and switches work with MAC addresses at Layer 2 of the OSI model. Hubs are really just multi-port repeaters. They ignore the content of an Ethernet frame and simply resend every frame they receive out every interface on the hub. The challenge is that the Ethernet frames will show up at every device attached to a hub instead of just the intended destination (a security gap), and inbound frames often collide with outbound frames (a performance issue).