Lesson 25 - Switch Port Security

This post is the last one related to layer 2 technologies. With the next posts, I will shift my focus to layer 3 technologies. If you use GN...

Lesson 24 - Layer 2 Etherchannel

There are two more things I would like to cover in this Cisco fundamentals series that relates to switches: the etherchannel technology and ...

Lesson 23 - Introduction to Rapid STP (802.1w)

Good news is that if you have learned 802.1d protocol (STP standard), only few things change in terms of the terminology and operation in t...

Lesson 22 - Spanning-Tree Cisco Enhancements

My previous two posts hopefully shed some light on IEEE 802.1d protocol (yes, it is STP). There are two more things I would like to add to t...

Lesson 21 - Spanning-Tree Protocol in Practice

Previous post was designed to present in a nutshell the STP operation. However, without some practice it's just academic knowledge. I th...

Lesson 20 - Spanning-Tree Protocol Operation

In my previous post I tried to stress the need for redundant connections between the switches. Multiple paths help us avoid a single point o...