What is a gateway?

• A. A virtual private network server
• B. None of the listed choices are correct.
• C. A network interface controller (NIC)
• D. A network node that routes traffic to external networks

Answer: (D)

A gateway is the network device that sits at the edge of a local network and serves as the path for traffic moving to external networks. It is the next hop defined in hosts’ routing tables for destinations outside the local subnet, and it often performs tasks like routing, NAT, and basic policy enforcement. This makes it the essential boundary that controls how packets leave the internal network toward the Internet or other networks. A VPN server simply provides a secure tunnel for remote access, and a NIC is just a network interface card, not the routing function.