Request-Reply Protocol Quiz

What is the main characteristic of synchronous request-reply communication?

• Server may be executing an operation more than once for the same request

• Messages are not guaranteed to be delivered in sender order

• Clients are blocked until the server performs the requested operation

• Clients can afford to retrieve replies later

Which method is used by clients to invoke remote operations?

• doOperation

• getRequest and sendReply

• sendReply

• getRequest

What does the getRequest() method do in server process?

• Generates a requestId for each request message

• Sends the reply message to the client

• Acquires a client request via the server port

• Sends a request message to the remote object and returns the reply

What is the purpose of using a timeout in the doOperation method?

• To acquire a client request via the server port

• To send the request message repeatedly until it gets a reply

• To discard duplicate request messages

• To indicate to the client that the doOperation has failed

What is the Request (R) Protocol used for?

• When the called procedure has nothing to return and the client requires no confirmation

• To queue separate RPC requests in a transmission buffer on the client side

• To send the reply message to the client

• To acquire a client request via the server port

What is the main characteristic of the Request/Reply (RR) Protocol?

• It is based on the request-reply protocol

• It is used to queue separate RPC requests in a transmission buffer on the client side

• It is used when the called procedure has nothing to return and the client requires no confirmation

• It is used to acquire a client request via the server port

What is the purpose of the Request/Reply/Acknowledge-Reply (RRA) Protocol?

• To discard duplicate request messages

• To acquire a client request via the server port

• To send the request message repeatedly until it gets a reply

• To serve as an ack for the request msg

What is the Failure Model of the request/Reply Protocol related to?

• Timeout

• Communication failures

• Special acknowledgement messages

• Discarding duplicate request messages

What is the purpose of the doOperation method after a timeout?

• To indicate to the client that the doOperation has failed

• To send the request message repeatedly until it gets a reply

• To discard duplicate request messages

• To serve as an ack for the request msg

What is the main characteristic of the Batch Mode RPC?

• It is used to queue separate RPC requests in a transmission buffer on the client side

• It is used when the called procedure has nothing to return and the client requires no confirmation

• It is based on the request-reply protocol

• It is used to acquire a client request via the server port