VLAN trunks between Cisco Catalyst switches support all VLANs known to the switches. As time progresses, each time the switch learns of a new VLAN, the VLAN trunk also allows traffic in the VLAN [...]

Configuring VLANs on access switches may be the most common repetitive configuration task in many networks. So what do you configure when adding new access devices to new VLANs? This lab gives [...]

You can memorize VLAN trunking commands by staring at a table – but you will remember them much better if you try different combinations in sample labs, especially if you try them from the CLI of [...]

Short and sweet – how do you create new VLANs and put a couple of ports in each? Today’s lab should be an easy and automatic process before you go take the CCNA exam, but getting one more rep in [...]

Can you think abstractly about how layer 2 switching works, and how VLANs and trunks impact their forwarding decisions? Or do you need to see the specific configurations to make sense of it? This [...]

Layer 2 switching seems easy – but then you must think through how it works in a real network. Applying the ideas proves whether you really understood the concepts or not. This next question [...]

The previous post posed a question that appeared straightforward – but one that set up a couple of the more common mistakes that people make with the subject of Layer 2 frame forwarding.  The [...]

How does a Layer 2 switch choose where to send a frame? Does it think about more than the destination MAC address? One of the common mistakes videos in the new “CCENT ICND1 100-105 Exam Prep [...]