20. Explain the differences between single, multiple, and reentrant WCF concurrency
21. Explain the differences between per-call, per-session, and single WCF instancing
22. Explain the usage of the OperationContract attribute
23. What is the MEX endpoint?
24. Explain the benefits of durable message stores, and list a WCF binding that can be durable
25. Explain the benefits of reliable transports, and list a WCF binding that can provide reliable session support