1.14MuleSoft isn't just Salesforce

Your interviewers may deliberately move away from your known scenario.

For example:

HTTP
 ↓
Mule
 ↓
PostgreSQL
 ↓
Mule
 ↓
Salesforce
 ↓
Mule
 ↓
Kafka

or:

Salesforce
    ↓
Mule
 ┌──┼─────────┐
 ↓  ↓         ↓
ERP billing  Data Warehouse

That's why your mental model should be:

MuleSoft orchestrates systems, rather than “MuleSoft sends things to Salesforce.”