Question

Which of the following command lines can be used to scan an entire subnet with nmap?

a. nmap -30
b. nmap
c. nmap
d. nmap /*

Answer 1

To scan an entire subnet with nmap, you would use the command line nmap -sn.

Step-by-step explanation:

To scan an entire subnet with nmap, you would use the command line nmap -sn. The option -sn stands for "ping scan" and instructs nmap to send ICMP echo requests to every IP address in the specified subnet. This allows nmap to determine which hosts are active.

For example, if you want to scan the subnet 192.168.0.0/24, you would use the command nmap -sn 192.168.0.0/24.

It is important to note that scanning an entire subnet may take a long time and can potentially generate a large amount of network traffic. Therefore, it is recommended to use this command responsibly and with proper authorization.

Answer 2

nmap command lines can be used to scan an entire subnet with nmap.

Thus, the correct answer is option b. nmap.

Step-by-step explanation:

The correct command to scan an entire subnet with nmap is option b. "nmap" without any additional arguments will perform a basic scan on the localhost or the specified target. To scan an entire subnet, you can provide the subnet range as an argument after the "nmap" command.

In the context of networking, a subnet is a range of IP addresses. To scan an entire subnet, you specify the subnet range after the "nmap" command. For example:

nmap 192.168.1.0/24

This command will scan all the IP addresses in the 192.168.1.0 subnet. The "/24" is a subnet mask, indicating that the first 24 bits are the network portion, and the remaining 8 bits are for host addresses.

It's important to note that options a, c, and d do not provide the necessary subnet information or contain syntax errors. Option a, "nmap -30," appears to have a typographical error, and option d, "nmap /*," has invalid syntax. The correct and concise way to scan an entire subnet is to use the basic "nmap" command followed by the subnet range. Therefore, the correct answer is option b. nmap.