Allows clients and servers to communicate in distributed client/server programs.

Allows clients and servers to communicate in distributed client/server programs.

• A. DNS Cache Snooping
• B. LDNS
• C. IKE
• D. Remote Procedure Call (RPC)

Answer: (D)

Remote Procedure Call enables a client to invoke a function on a remote server, making distributed client/server communication appear as if it were a local call. The client uses a stub to marshal the procedure name and arguments into a request sent over the network. The server receives the message, unmarshals it, executes the requested procedure, and returns the result to the client, where it is unmarshaled and used as if the computation happened locally. This abstraction hides the network details, data encoding, and error handling, allowing developers to build distributed applications without dealing with low-level communication for every call. RPC can operate synchronously (waiting for a result) or asynchronously, but the essential point is that it directly enables remote execution of procedures across machines, which is why it best fits the description of allowing clients and servers to communicate in distributed client/server programs. The other options relate to DNS information or cryptographic key exchange, not to the mechanism for invoking remote procedures.

Remote Procedure Call enables a client to invoke a function on a remote server, making distributed client/server communication appear as if it were a local call. The client uses a stub to marshal the procedure name and arguments into a request sent over the network. The server receives the message, unmarshals it, executes the requested procedure, and returns the result to the client, where it is unmarshaled and used as if the computation happened locally. This abstraction hides the network details, data encoding, and error handling, allowing developers to build distributed applications without dealing with low-level communication for every call. RPC can operate synchronously (waiting for a result) or asynchronously, but the essential point is that it directly enables remote execution of procedures across machines, which is why it best fits the description of allowing clients and servers to communicate in distributed client/server programs. The other options relate to DNS information or cryptographic key exchange, not to the mechanism for invoking remote procedures.