フリー問題

問題文

A web application places its servlets and its clustered enterprise beans on one and the same WebLogic Server cluster. A colleague proposes moving the beans onto a cluster of their own. What does that move buy for the calls a servlet makes, and what does it give away?

選択肢

1. It buys load balancing of the method calls that a servlet makes to a bean, and it gives away the ability to place a firewall between the clients outside and the servers that are holding the beans of the application
2. It buys load balancing of the method calls that a servlet makes to a bean, and it gives away the optimization that lets a servlet reach the replica of a bean sitting on the very server that the servlet itself is running on
3. It buys the sharing of one replica of a bean by the servers of the domain, and it gives away the optimization that lets a servlet reach the replica of a bean sitting on the very server that the servlet itself runs on
4. It buys the sharing of one replica of a bean by the whole of the domain, and it gives away the ability to place a firewall between the clients outside and the hosts that are holding the beans of the application