Routed mode requires the ACE run OSPF or EIGRP
Bridged mode switches a packet between the public and the private subnets when it sees itsMAC address as the destination
Two-armed mode will place the SLB inline to the servers， with different client-side and a server-side VLANs
One-armed mode， which uses the same VLAN for the client， the ACE， and the servers， requiresa traffic-diversion mechanism to ensure the traffic return from the server passes though the ACE