312-50V11 · Question #965
Elante company has recently hired James as a penetration tester. He was tasked with performing enumeration on an organization's network. In the process of enumeration, James discovered a service that
The correct answer is B. File Transfer Protocol (FTP). Port 21 is the IANA-assigned well-known port for the File Transfer Protocol (FTP) control connection.
Question
Options
- ABorder Gateway Protocol (BGP)
- BFile Transfer Protocol (FTP)
- CNetwork File System (NFS)
- DRemote procedure call (RPC)
How the community answered
(21 responses)- B95% (20)
- D5% (1)
Why each option
Port 21 is the IANA-assigned well-known port for the File Transfer Protocol (FTP) control connection.
Border Gateway Protocol (BGP) operates on TCP port 179, not port 21.
FTP uses TCP port 21 for its control channel, which handles client commands and server responses during a session. It is a common service exposed to external sources, making it a standard enumeration target during penetration tests. Port 21 is universally recognized as the default FTP port per IANA standards.
Network File System (NFS) uses TCP/UDP port 2049, not port 21.
Remote Procedure Call (RPC) uses TCP/UDP port 111 via the portmapper service, not port 21.
Concept tested: Well-known TCP port assignment for FTP
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
Topics
Community Discussion
No community discussion yet for this question.