Which tool is used to provide a list of open ports on network devices?Select one:WhoisPingNmapTracert

The tool used to provide a list of open ports on network devices is Nmap.

Here's a step-by-step explanation:

1. Nmap, which stands for Network Mapper, is a free and open-source tool used for network discovery and security auditing.

2. It can be used to discover hosts and services on a computer network, thus creating a "map" of the network.

3. One of its features is the ability to identify what ports on a network are open. It does this by sending packets to the target host(s) and then analyzing the responses.

4. By identifying open ports, Nmap can help determine what services (like HTTP, FTP, SSH, etc.) are running on those ports.

5. This information can be useful for network administrators to secure their networks, or by attackers to exploit vulnerabilities.

So, out of the options provided - Whois, Ping, Nmap, Tracert - the correct answer is Nmap.