NetCat is commonly used in assessments to:

• A. Establish a port relay and tunnel to bypass inbound rules
• B. Encrypt traffic to secure communication
• C. Scan for open ports only on a single host
• D. Create graphical maps of networks

Answer: (A)

NetCat’s versatility in assessments centers on its ability to forward or relay traffic between connections, effectively creating tunnels through which data can flow. This lets an tester reach systems that are protected by inbound firewall rules by using an outbound path to establish a relay, so internal hosts can be accessed or data can be exfiltrated without exposing open services directly to the outside. In practice, you can set NetCat to listen on a port and have another connection bridge into a target service, or chain two NetCat processes to forward traffic from one network segment to another. That tunneling capability is what makes NetCat a common tool for bypassing inbound restrictions during engagements.

NetCat doesn’t inherently encrypt traffic, which is why using it to secure communications isn’t its intended purpose. It also isn’t a primary port-scanning tool—while you can probe ports, its strength isn’t scanning across many hosts like a dedicated scanner would. And it doesn’t generate graphical network maps.