When it comes to interviewing for a position in the marketing field, you will find in most cases that the interview will focus on examining your confidence, knowledge and temperament. The questions will usually be targeted at getting responses that can be examined closely to reveal traits about you and your abilities, as well as how you work under pressure.
Since marketing is closely related to sales, you can expect questions related to sales and examining your selling skills. Since the purpose of sales is to move items, then coming up with new ideas and innovative ways to improve moving items will most likely also show up. With the field of marketing being competitive and stressful in most cases, the interview process will seek to challenge your knowledge, abilities and temperament to see if they think you have what it takes to stay afloat in this field. If you can come across as confident and energetic, and can successfully display you have the knowledge and skills for this field, then your chances of landing the job are more certain.
Testing your sales ability may be done with something as simple as them asking you to sell them their stapler. Your job is to point out the pros of their stapler, and attempt to convince them with all of the important features the stapler has to offer. They will most like throw in doubtful questions and inquiries about what you are saying, in an effort to determine your ability to convince people in the face of objections. They may test your temperament by pushing you with more and more questions, to see if you can keep your cool and stick to the task of convincing them.
Improving the service and sales of the company is a goal within marketing, so you will probably be asked to explain any strategies you may have to examine and seek to improve things for the company. This is not so much a line for line attack plan as much as it is just to see if you have the plans and commitment to improving things with potentially new and innovative ideas. Give examples of prior work you have done that was successful and productive in this area. This type of question also helps to reveal much about your temperament and traits.
As with most all interviews, the job is to sell you as the best candidate. As someone in marketing, this should be a fairly easy task if you have the skills needed to compete in the area of sales and marketing.