Question

you suspect someone is hijacking your wireless signal instead of paying for their own internet! one way to see if this is true would be to access: (1 point) your routers dns server, looking for an unknown ip address. your modems url, looking for an unknown isp. your modems extranet, looking for an unknown domain. your computers cloud server, looking for an unknown tcp/ip.

Explanation:

• Routers manage network connections. The DNS server in a router maps domain names to IP addresses. If there's an unknown IP address accessing the network (via the router's DNS server), it could indicate unauthorized access (someone hijacking the wireless signal).
• A modem's URL is related to its configuration and connection to the ISP (Internet Service Provider), not directly to detecting unauthorized network users.
• An extranet is a private network that uses the Internet to share information with other organizations, not relevant to detecting a hijacked home wireless signal.
• A computer's cloud server is for accessing cloud - based services, and TCP/IP is a network protocol suite. Checking a computer's cloud server for an unknown TCP/IP is not the way to detect a hijacked wireless signal.

Answer:

your router’s DNS server, looking for an unknown IP address.