SK0-004 · Question #355
A new version of the primary OS used by a company has been released. Due to some significant changes in the OS, a system administrator wants to see which remotely accessible services are enabled by…
The correct answer is B. Port scanner. Before upgrading an OS, the administrator needs to enumerate which network services are listening on open ports by default. A port scanner is the appropriate tool to discover all remotely accessible services across the system.
Question
A new version of the primary OS used by a company has been released. Due to some significant changes in the OS, a system administrator wants to see which remotely accessible services are enabled by default to access the security risk prior to upgrading to the new version. Which of the following utilities should the administrator use?
Options
- ACipher program
- BPort scanner
- CTelnet client
- DPacket sniffer
How the community answered
(13 responses)- A8% (1)
- B69% (9)
- C8% (1)
- D15% (2)
Why each option
Before upgrading an OS, the administrator needs to enumerate which network services are listening on open ports by default. A port scanner is the appropriate tool to discover all remotely accessible services across the system.
A cipher program is used to encrypt or decrypt files and has no capability to enumerate listening network services.
A port scanner probes a target host across a range of TCP and UDP ports, reporting which ones are open and what services are listening. This allows an administrator to audit the default attack surface of a new OS before deployment. Tools like Nmap can identify service versions and protocols, giving a complete picture of remote accessibility.
A Telnet client can connect to a specific known port to test reachability but cannot systematically discover which ports are open across an entire system.
A packet sniffer captures traffic on the network wire but requires traffic to already be flowing - it does not actively probe or enumerate open ports on a host.
Concept tested: Using a port scanner to audit open services
Source: https://nmap.org/book/man.html
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