Here are some common digital marketing interview questions:

1. Can you explain what digital marketing is and its importance?
2. How do you stay up-to-date on the latest digital marketing trends?
3. How do you measure the success of a digital marketing campaign?
4. How do you optimize a website for search engines?
5. Can you explain the difference between SEO and SEM?
6. How do you use social media to achieve marketing goals?
7. Can you give an example of a successful digital marketing campaign you have planned or executed?
8. How do you integrate digital marketing with traditional marketing?
9. Can you explain how you would use email marketing to promote a product or service?
10. How do you use data and analytics to inform your digital marketing strategy?

Note that this list is not exhaustive, Interviewer could ask question based on specific aspect of digital marketing they are interested in.