I will put here some of the questions which i have faced in my previous interviews.
1. Proxy configuration in single stack(7.31).
2. Proxy message monitor from end to end.
3. How do you design and configure proxy scenarios?
4. How many types of proxies ?What are they?
5. Java Mapping (Business case where and why we use).
6. XSLT Mapping Business case.
7. JDBC sender adapter(How to avoid Duplicate records while queuing from database?)
8. Is there any standard Adapter module to avoid the namespaces?
9. One case where you can use Custom adapter module and Standard adapter module.