nmap(Network Mapper) is the best tool in this scenario. It can scan the 192.168.1.0/24 subnet to discoverlive hosts, open ports (like Telnet on port 23), and device types. It's ideal for mapping and auditing the network.
* A. digis a DNS lookup tool; not useful for identifying hosts on a subnet.
* C. tracertshows the path packets take to a destination, not for host discovery.
* D. telnetis the protocol being used, not a tool for scanning or identifying devices.
#Reference:
CompTIA Network+ N10-009 Official Objectives: 5.1 - Given a scenario, use the appropriate network troubleshooting tools.