You are responsible for an e-commerce site. The site is hosted in a cluster. Which of the following techniques would be best in assuring availability?

Load-balancing the cluster will prevent any single server from being overloaded. And if a given server is offline, other servers can take on its workload. A VPN concentrator, as the name suggests, is used to initiate virtual private networks (VPNs). Aggregate switching can shunt more bandwidth to the servers but won't mitigate the threat of one or more servers being offline. SSL accelerators are a method of offloading processor-intensive public key encryption for Transport Layer Security (TLS) and Secure Sockets Layer (SSL) to a hardware accelerator.