Lesson 11 — inter-VLAN routing Flashcards
What is Inter-VLAN Routing?
The process of forwarding network traffic from one VLAN to another VLAN.
Can hosts in different VLANs communicate without a router or Layer 3 switch?
No, they require a Layer 3 device to communicate.
What are the three Inter-VLAN Routing methods?
- Legacy Inter-VLAN Routing – outdated, not scalable
- Router-on-a-Stick – suitable for small to medium networks
- Layer 3 Switch with SVIs – scalable for medium to large networks
Which Inter-VLAN routing method is most scalable?
Layer 3 switch using switched virtual interfaces (SVIs).
What is Legacy Inter-VLAN Routing?
A method using a router with multiple physical Ethernet interfaces, each connected to a different VLAN.
How did each router interface function in Legacy Inter-VLAN Routing?
Each interface acted as the default gateway for the hosts in its VLAN.
Why is Legacy Inter-VLAN Routing not scalable?
It requires one physical router interface per VLAN, quickly exhausting interface capacity.
Is Legacy Inter-VLAN Routing still used today?
No, it’s outdated and not implemented in modern switched networks—used for educational purposes only.
What is a key capability of a Layer 3 switch for VLANs?
It can route traffic between VLANs using Switched Virtual Interfaces (SVIs).
What command is used to configure an SVI on a Layer 3 switch?
interface vlan vlan-id
What is a routed port on a Layer 3 switch?
A Layer 2 switchport converted to a Layer 3 interface, similar to a router interface.
Can a Layer 3 switch perform routing like a traditional router?
Yes, it can route between VLANs and support routed ports.
What is the first step to enable Inter-VLAN Routing on a Layer 3 switch?
Create the VLANs and the corresponding SVI VLAN interfaces.
How do you convert a Layer 2 switchport into a routed Layer 3 port?
Use the command: no switchport in interface configuration mode.
What command enables routing functionality on a Layer 3 switch?
Use the global configuration command: ip routing.
