Which port is used by the RPC Endpoint Mapper for dynamic RPC services?

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Study for the CPSA Port Numbers Exam. Practice with flashcards and multiple choice questions, each with hints and explanations. Get ready for your test!

Multiple Choice

Which port is used by the RPC Endpoint Mapper for dynamic RPC services?

Explanation:
RPC Endpoint Mapper acts as a directory for RPC services and listens on port 135 for both UDP and TCP. When a client wants to call an RPC service, it first connects to this mapper on port 135 to learn the actual port the service is listening on. The mapper returns that dynamic port, and the client then connects to the service on that port. The dynamic port is allocated by the system, typically from a high-numbered range, so the mapper is the stable entry point for discovery. That’s why port 135 UDP/TCP is the correct choice. The other ports shown correspond to HTTP (80), HTTPS (443), and DNS (53), which are not used for RPC endpoint mapping.

RPC Endpoint Mapper acts as a directory for RPC services and listens on port 135 for both UDP and TCP. When a client wants to call an RPC service, it first connects to this mapper on port 135 to learn the actual port the service is listening on. The mapper returns that dynamic port, and the client then connects to the service on that port. The dynamic port is allocated by the system, typically from a high-numbered range, so the mapper is the stable entry point for discovery. That’s why port 135 UDP/TCP is the correct choice. The other ports shown correspond to HTTP (80), HTTPS (443), and DNS (53), which are not used for RPC endpoint mapping.

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