किसी नेटवर्क में फ़ायरवॉल (Firewall) का मुख्य कार्य क्या होता है?

______ is a security device or software used to monitor and control incoming and outgoing network traffic.

Evaluate the validity of these statements in the context of bank computerization security: Statement 1: Local Area Network (LAN) technology within a bank branch typically uses Ethernet cables and switches to connect computers, printers, and scanners within a limited geographical area like a single building. Statement 2: A Firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies. Statement 3: In a modern bank, the Firewall is placed only at the branch level, and is not required at the Data Center because the central servers are already password-protected.