You are a service provider and have multiple customers in a building. You are installing a new switch that can host all of your customers. However, you would like to ensure that one customer cannot…

You are a service provider and have multiple customers in a building. You are installing a new switch that can host all of your customers. However, you would like to ensure that one customer cannot see or broadcast to another customer. You would also like to have them use a common gateway IP address from the building. What should be used to provide this access?