312-50V13 Question #405: Real Exam Question with Answer & Explanation

Question

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 byjames in the above scenario?

Options

• ABorder Gateway Protocol (BGP)
• BFile Transfer Protocol (FTP)
• CNetwork File System (NFS)
• DRemote procedure call (RPC)

Explanation

The service running directly on port 21 and accessible to external sources is the File Transfer Protocol (FTP).

Common mistakes.

• A. Border Gateway Protocol (BGP) typically uses port 179 for establishing peering sessions between routers.
• C. Network File System (NFS) primarily uses port 2049, along with other ports for RPC services.
• D. Remote Procedure Call (RPC) services can use various ports, often dynamically assigned or registered with a port mapper (port 111 for ONC RPC), but not primarily port 21.

Concept tested. Common network service ports

Reference. https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml

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