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Private VLANs: Advanced Switching Tips and Tricks

Webinar – Recorded | Oct. 10, 2011

In this hour-long webinar, Global Knowledge instructor John Barnes will guide you through implementing Cisco private VLANs. He will review VLANs and 802.1q, and he will discuss private VLAN fundamentals and operation, covering primary VLANs and secondary VLANs. He will cover VLAN mapping and discuss using private VLANs between multiple switches. He will also provide a use case example.

ACUCW1 or ACUCW2 - Which Course is Right for You?

Video | July 21, 2011

Global Knowledge Course Director and Lab Topology Architect Joey DeWiele, a specialist in Unified Communications, explains the difference between our Cisco Unified Communications courses - ACUCW1 & ACUCW2.

Routing Decisions: Best Path Selection

Article | June 23, 2011

According to the OSI layer concept, routing, or best path selection, takes place on Layer 3 and is based on the logical address. In this post, we want to discuss some of the points in that statement.

Routing Decisions: Best Path Selection

Article | June 23, 2011

According to the OSI layer concept, routing, or best path selection, takes place on Layer 3 and is based on the logical address. In this post, we want to discuss some of the points in that statement.

Datagram Transport Layer Service - DTLS

Article | May 25, 2011

This week’s post highlights some of the features and implementation specifics regarding the Datagram Transport Layer Service (DTLS) protocol used in Virtual Private Networks with the Cisco AnyConnect® SSL client. I’ll provide some background as well as some screenshots and supported CLI commands.

How to Successfully Migrate from IPv4 to IPv6

Webinar – Recorded | April 20, 2011

In this webinar, you will examine the need for IPv6 and whether it's possible to survive on IPv6 alone. You will learn ways to phase in IPv6 and how to successfully migrate to IPv6.

2011 IT Skills and Salary Report

Special Report | April 04, 2011

For the fourth year in a row, Global Knowledge and TechRepublic have partnered to create a comprehensive IT salary survey. With over 12,000 responses, the 2011 report has turned out to be one of this year's most relevant and revealing salary surveys in the industry. Below is our complete list of Salaries by Popular Certifications and Salaries by State.

The shun Command on the PIX/ASA

Article | March 24, 2011

One command that had a fairly long history first with the PIX Firewall and now the ASA is the shun command. In this post we’ll examine this command’s history, why it’s useful, and its new-found resurgence in threat detection implementation.

The History Behind EIGRP

Article | Feb. 16, 2011

Interior Gateway Routing Protocol (IGRP) was a Cisco-proprietary Distance-Vector (D-V) classful routing protocol - basically an improved version of RIPv1. Like other D-V protocols, each IGRP router periodically flooded its routing table, but it differed from RIP in two ways. First, RIP’s advertisement interval was thirty seconds but IGRP’s was ninety seconds, which allowed IGRP to scale to larger networks than RIP. Second, RIP used a simple hop count metric, but IGRP’s more sophisticated metric was based on minimum path bandwidth and total path delay, with options to include link reliability and interface loading.

Implementing Dynamic DNS on Cisco IOS Router and ASA

Article | Dec. 09, 2010

When the hostname.domainname associated with my Small Office Home Office (SOHO) failed to update after a power outage, and a new DHCP-assigned external address was assigned to my router, I was reminded of the need for Dynamic DNS. This article will explore the implem...