Which of the following VLANs do(es) NOT participate in inter-VLAN routing through the rtrA router?

Last Updated on August 1, 2021 by Admin 2

Refer to the following network diagram:

300-420 Part 05 Q15 040
300-420 Part 05 Q15 040

You executed the following commands on the swtA switch:

300-420 Part 05 Q15 041
300-420 Part 05 Q15 041

You executed the following commands on the rtrA switch:

300-420 Part 05 Q15 042
300-420 Part 05 Q15 042

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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