What is Boundary Control used for?

Boundary control is primarily focused on managing the flow of information across the perimeter of a network, specifically regarding ingress (incoming) and egress (outgoing) data. This process is essential in protecting the network from unauthorized access and potential threats, as it establishes security measures that regulate which data can enter or leave the network. Techniques used for boundary control include firewalls, intrusion detection systems, and access control lists, all aimed at creating a secure boundary that prevents malicious activities while allowing legitimate communication.

The other options do not accurately capture the main purpose of boundary control. Tracking user activity relates more to monitoring and auditing, which is a different aspect of security management. Maintaining data integrity involves ensuring that information remains accurate and unaltered during storage or transmission but is not the direct focus of boundary control. Providing network services to end users encompasses the general functionality of a network rather than the specific security measures involved in boundary control. Thus, the correct answer highlights the essence of boundary control as it pertains to the management of data flow at the network's edges.