Inter-VLAN Routing Router-on-a-Stick Quiz and Flashcards

What is the primary purpose of Inter-VLAN routing?

What is a characteristic of traditional Inter-VLAN routing?

What is removed from a frame during the Inter-VLAN routing process?

What is a key feature of Router-on-a-stick Inter-VLAN routing?

What is the purpose of a subinterface in Inter-VLAN routing?

What is a trunk link in the context of Inter-VLAN routing?

What is the purpose of creating a subinterface in router-on-a-stick inter-VLAN routing?

What is the syntax to create a subinterface in router configuration mode?

Which command is used to assign a subinterface to a VLAN?

What is the purpose of the management VLAN?

What is the outcome of assigning an IP address to a subinterface?

What is the typical association between the subinterface number and the VLAN number?

What is the limitation of traditional inter-VLAN routing using physical interfaces?

What is the function of a subinterface in router-on-a-stick inter-VLAN routing?

What is a trunk link connected to in a router-on-a-stick inter-VLAN routing configuration?

Inter-VLAN Routing

Inter-VLAN routing is the process of forwarding traffic from one VLAN to another VLAN using a router.
Each VLAN is a unique broadcast domain and IP subnetwork, and computers on separate VLANs cannot communicate by default.

Traditional Inter-VLAN Routing

Requires a router to have multiple physical interfaces, each connected to a VLAN and configured with an IP address for the subnet associated with that VLAN.
Each interface is routed internally to the proper subnet, and VLAN tags are removed.
This method is limited by the physical hardware limitations of a router.

Router-on-a-Stick Inter-VLAN Routing

Overcomes the hardware limitation of a router by using subinterfaces, which are software-based virtual interfaces assigned to physical interfaces.
Each subinterface is configured with its own IP address, subnet mask, and unique VLAN assignment.
Functionally the same as using the traditional routing model.
Uses a single physical interface for all VLANs, with VLAN tags removed and added as needed.

Configuring Subinterfaces

Create a subinterface with a syntax of interface [interface].nn, where nn is the subinterface number (typically associated with the VLAN number).
Assign the subinterface to a VLAN using encapsulation dot1q vlan-id.
Assign an IP address to the subinterface, which will become the default gateway for that VLAN.

Layer 3 Switch Inter-VLAN Routing

Uses Switch Virtual Interfaces (SVI) to retag the frame.
VLAN tags are removed and added as needed.

Learn about configuring subinterfaces and router-on-a-stick inter-VLAN routing, including assigning IP addresses and VLANs. Test your knowledge of Chapter 6 interfaces and subinterfaces.