CREST Practitioner Security Analyst (CPSA) Practice

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What method can be used to assess RPC enumeration?

HTTP requests
SNMP queries
Portmapper requests
Telnet connections

The correct answer is: Portmapper requests

To assess RPC (Remote Procedure Call) enumeration effectively, the use of Portmapper requests is particularly relevant. Portmapper operates over the RPC protocol, which is designed to facilitate communication between applications and services on a network. When a Portmapper service is queried, it responds with mapping information about the ports being used by various RPC services. This helps in identifying which services are running on the host and which ports they are associated with, thereby facilitating the enumeration of RPC services. While HTTP requests, SNMP queries, and Telnet connections are useful in various network interactions, they do not specifically target the enumeration of RPC services. HTTP requests are relevant for web services, SNMP is used primarily for network management, and Telnet serves for command-line access to devices but lacks the capability to enumerate RPC services effectively. Hence, Portmapper requests are the most direct and appropriate method to assess RPC enumeration.