Cross-selling refers to the practice of selling additional products or services to an existing customer. In the context of Cisco Small and Medium Business Engineer, when an account manager sells a security solution that integrates with the customer's current Cisco networking solution, it is considered cross-selling. This is because the security solution is complementary to the products the customer already uses, thereby providing an integrated and enhanced experience. Cross-selling is a strategic approach to provide customers with additional value, often leading to increased customer satisfaction and loyalty123. References :=