📖 What is VLAN (Virtual Local Area Network)?
A logical subset of a switch's ports that form a single broadcast domain. Devices in different VLANs cannot communicate directly without a Layer 3 device.
"A router or Layer 3 switch is always required for inter-VLAN communication, often implemented as 'Router on a Stick' for CCNA labs."
📚 Certification: Certified Network Associate (200-301)
🔑 What are the Key Concepts of VLAN (Virtual Local Area Network)?
- ▸ Segmentation of broadcast domains at Layer 2
- ▸ Logical grouping of devices regardless of physical location
- ▸ Improvement of network security and traffic management
- ▸ Subnet-to-VLAN mapping best practices (typically 1:1)
🎯 How does VLAN (Virtual Local Area Network) appear on the 200-301 Exam?
Troubleshooting connectivity issues where hosts are in different VLANs without a routing device.
Identifying the broadcast domain boundaries in a given network topology diagram.
Configuring Router-on-a-Stick to route traffic between two newly created VLANs.
❓ Frequently Asked Questions
Why can't computers in different VLANs ping each other?
Because VLANs create separate broadcast domains, requiring a Layer 3 device like a router or Layer 3 switch to route traffic between them.
How many broadcast domains are created by a 24-port switch with 3 VLANs?
3 broadcast domains. Each VLAN represents its own separate broadcast domain.