d) Operation Cost

All methods needs the following items:
Node Identifier, Filtering Identifier
management of these two bindings

  Methods| Node-ID  Filtering-ID          Management
  -------+--------------------------------------------------------
  Layer2 | User-ID  IP addr/VLAN-ID       Layer2 & Layer3
  Layer3 | DUID     IP addr               DHCP
  Tunnel | User-ID  IP addr/Tunnel-Server Tunnel-Session-Protocol
  Policy | User-ID  anything              Policy-Management