फायरवॉलचे खालीलपैकी कार्य हे ________ आहे.

The correct answer is Option A (It is to safeguard internal network from vulnerable outside network.).

Key Points:
• In computer networking, a Firewall is a security device (hardware or software) that monitors and filters incoming and outgoing network traffic based on predetermined security rules.
• The primary role of a firewall is to create a barrier between a trusted internal network (private intranet or LAN) and an untrusted/vulnerable external network (such as the Internet) to safeguard internal systems from malicious unauthorized intrusions, viruses, and hacking attacks.
• Routers, gateways, or modems—not firewalls—are designed specifically to connect LAN to WAN physically/logically.
• Therefore, the primary function of a firewall is to safeguard the internal network from untrusted external networks (Option 1).
• Key Takeaway: A firewall protects a secure internal network by filtering unauthorized access from vulnerable external networks.