What is a disadvantage of using router-on-a-stick inter-VLAN routing?

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#1

What is a disadvantage of using router-on-a-stick inter-VLAN routing?

  1. does not support VLAN-tagged packets
  2. requires the use of more physical interfaces than legacy inter-VLAN routing
  3. does not scale well beyond 50 VLANs
  4. requires the use of multiple router interfaces configured to operate as access links

Explanation: Router-on-a-stick inter-VLAN routing does not scale beyond 50 VLANs. The router can receive VLAN-tagged packets and send VLAN-tagged packets to a destination. Router-on-a-stick inter-VLAN routing can utilize a single router interface as a trunk link to receive and forward VLAN traffic and does not require multiple interfaces