Certified Ethical Hacker (CEH v11) — Question 372

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 is accessible to external sources. This service runs directly on port 21.
What is the service enumerated by James in the above scenario?

Answer options

• A. Network File System (NFS)
• B. Remote procedure call (RPC)
• C. Border Gateway Protocol (BGP)
• D. File Transfer Protocol (FTP)

Correct answer: D

Explanation

The correct answer is D, File Transfer Protocol (FTP), as it is the service that operates on port 21. The other options, NFS, RPC, and BGP, do not use port 21 and are associated with different protocols and functionalities.