Assignment 3- REMOTE METHOD INVOCATION AND OBJECTS

Which of the following are the RPC protocols?

• Request Protocol

• Request-Reply Protocol

• Request-Reply-Acknowledgement Protocol

• All the above

The method that registers a Java object in RMI registry is

• naming.bind & namin.rebind

• naming.rebind & naming.lookup

• naming.bind & naming.rebind

• naming.lookup & naming.unbind

Sun XDR as an example of

• Internet-wide RPC

• the Web Services Description Language

• an IDL for RMI

• an IDL for RPC

Which of the following fault tolerance measure is related RPC call semantics ?

• Retry request messages

• Duplicate filtering

• Retransmission of results

• All the above

which of the following are Fault Tolerance measures in Request Reply protocol ?

• Retransmit request

  message

• Duplicate

  filtering

• Re-execute procedure

  or retransmit reply

• All the above

Which of the following semantic is RPC invocation semantic?

• Maybe semantic

• At-least-once semantics

• At-most-once semantics

• All the above

Marshalling is the process of

• is the process of taking a collection of data items and assembling them into a form suitable for transmission in a message.

• is the process of disassembling them on arrival to produce an equivalent collection of data items at the destination.

• the generation of primitive values from their external data representation and the rebuilding of the data structures.

• All the above

The operation "Idempotent" means

• can have the wrong effect if they are performed more than once.

• should not be performed twice

• that can be performed repeatedly with the same effect as if it had been performed exactly once.

• None of the above

Java serialization

• which is used for marshalling arguments and results

  in Sun RPC

• which is used for marshalling arguments and results

  in Java RMI

• which is used for marshalling arguments

  in Java RMI

• which is used for marshalling results

  in Java RMI

group communication means

• a family of approaches that all share the common

  characteristic of disseminating events to multiple recipients through an intermediary

• abstraction of a global shared memory to

  programmers.

• communication is via a group abstraction with the

  sender unaware of the identity of the recipients

• All the above