Last Updated on August 1, 2021 by Admin 2
Refer to the following network diagram:
You executed the following commands on the swtA switch:
You executed the following commands on the rtrA switch:
Which of the following VLANs do(es) NOT participate in inter-VLAN routing through the rtrA router?
- VLAN 11 only
- VLAN 22 only
- VLAN 33 only
- VLAN 11 and VLAN 22
- VLAN 22 and VLAN 33
- VLAN 33 and VLAN 11
Explanation:
VLAN 22 is the only VLAN that does not participate in inter-VLAN routing through the rtrA router. The given network diagram and the commands reflect a router-on-a-stick (RoaS) configuration. In a RoaS configuration, inter-VLAN routing is achieved in two steps.
The first step sets up the switch:
- Configure the switch
- Configure the required VLANs
- Configure the switch port connecting to the router interface as a trunk port
- Enable dot1q or ISL encapsulation on the trunk port
- Configure the switch ports connecting to the VLANs as access ports
- Assign the access switch ports to respective VLANs
The second step sets up the router:
- Configure the router
- Enable the router interface connected to the trunk switch port
- Create separate subinterfaces on the trunk router interface for each VLAN
- Enable dot1q or ISL encapsulation on the subinterfaces
- Assign IP addresses to each subinterface in the same subnet as the VLAN of which the interface will be a member. Consequently, this address will become the default gateway for each host in that VLAN.
In the scenario, the subinterface created for VLAN 22 is not configured for inter-VLAN routing because the encapsulation command is missing. Without this command, the encapsulation type and the VLAN ID remain
Objective:
Layer 2 Technologies
Sub-Objective:
Configure and verify trunking
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