Which device serves as the default gateway for the router?

• A. The router
• B. The ADNS
• C. The WUG server
• D. The switch

Answer: (B)

The key idea is that a default gateway is the next-hop device a router uses to reach any destination outside its own local network. In this setup, the router is configured to send traffic to the ADNS as that next hop. So, when the router needs to reach a network beyond its local segment, it forwards packets to the ADNS, which then routes toward the outside world. The other devices aren’t typically used as a gateway: a switch mainly handles local traffic within the same network; a WUG server is a management/server entity; a DNS server provides name resolution but isn’t generally the router’s path to external networks.