N10-009 · Question #168
After changes were made to a firewall, users are no longer able to access a web server. A network administrator wants to ensure that ports 80 and 443 on the web server are still accessible from the…
The correct answer is D. nmap. Users cannot access a web server after firewall changes; nmap is the best tool to verify if specific ports (80, 443) are open and accessible from the user IP space.
Question
After changes were made to a firewall, users are no longer able to access a web server. A network administrator wants to ensure that ports 80 and 443 on the web server are still accessible from the user IP space. Which of the following commands is best suited to perfom this testing?
Options
- ADig
- BIfconfig
- CPing
- Dnmap
How the community answered
(26 responses)- A4% (1)
- C8% (2)
- D88% (23)
Why each option
Users cannot access a web server after firewall changes; `nmap` is the best tool to verify if specific ports (80, 443) are open and accessible from the user IP space.
`Dig` (Domain Information Groper) is a command-line tool for querying DNS name servers, not for testing port accessibility.
`Ifconfig` is used to configure or display network interface parameters, not to test remote port accessibility.
`Ping` is used to test reachability to a host using ICMP, but it does not test specific application ports like 80 or 443.
`nmap` (Network Mapper) is a powerful network scanning tool that can be used to discover hosts and services on a computer network by sending packets and analyzing the responses. It can specifically test if particular ports (like 80 and 443) are open and reachable from a source IP address, providing detailed information on their status.
Concept tested: Network port scanning and service availability testing
Source: https://nmap.org/book/man-briefoptions.html
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