What function does a router serve in a network?

• A. It encrypts data packets for secure transmission
• B. It connects two networks and directs data packets
• C. It provides firewall protection for network security
• D. It controls user access to the network

Answer: (B)

A router is a critical component in networking as it connects different networks and efficiently directs data packets between them. This functionality is essential in managing traffic on the internet and within private networks, ensuring that data finds the most efficient path from the source to the destination.

When devices on one network need to communicate with devices on another, the router receives incoming data packets, analyzes the destination address contained within each packet, and determines the best way to forward it. This process is vital for facilitating communication across diverse network segments and maintaining optimal performance.

In contrast, the other functions mentioned in the choices are not primarily associated with the role of a router. For instance, while encryption is important for secure data transmission, it is typically managed by other devices or software applications rather than the router itself. Firewalls are separate systems that monitor and control incoming and outgoing network traffic based on predetermined security rules, whereas a router's primary role is routing rather than security. Similarly, controlling user access typically involves authentication mechanisms that fall outside the router's primary function.

Overall, the role of the router as a connector and router of data packets is indispensable for network communication, making it foundational to the infrastructure of both small and large networks.