Which is FALSE about Enterprise Java Beans?
Binds to a variety of services including RMI, JDBC, JNDI, JMS
Supports stateless objects
Supports stateful session
Uses JSON (Java serializable object networking) to represent the data
Which of the following is false about CORBA
Supports both persistent and transient communication
Uses an IDL based on C data types
Uses network pointer for addressing objects which encapsulates an object’s identity and location information
Is object based
None of the other options are false
Which of the following is a function of the Server Manager in the context of an Implementation Repository?
Starts servers if necessary
Converts messages to formats compatible with the server
Adding a transparency layer between a server and the implementation repository
Filtering messages which are incompatible with a server
Which of these is not a function of an Object Request Broker (ORB)?
Location of servants
Separating interface and implementation
Activation/deactivation of the servant’s container (the server process) where necessary
Scheduling the servant’s container (the server process) to be restarted when a message lease expires
Which of the following is false?
Static invocation requires that interfaces are known when the application is developed
Interfaces are usually specified in an interface definition language (IDL)
Dynamic invocation allows to compose RMI at run time
Dynamic invocation is only possible over IP based protocols
Which of the following is true about a Dynamic Invocation Interface (DII)?
allows clients to invoke objects without a precompiled stub
only compatible with dynamic/interpreted languages such as Python
Faster because pre-compiled stubs do not need to be loaded from memory
requires that the client knows the parameter list and function name in advance
Which of the following is false about web services?
Most useful for cross platform and application interoperability eg. business to business integration
XML encoding has a high parsing overhead
SOAP may be used in place of GET / POST
HTTP is stateful
Which of the following is true about a remote object with client-side proxy?
The state of the object is not distributed
The state of the object is distributed
The state of the object is replicated on both the client and the server
The application must decode results returned by the function from the encoding they were transmitted in
What is the function of WSDL?
Interface definition, similar to IDL
Discovering/locating services dynamically
Avoiding the drawbacks of XML by enabling the use of binary encoding
Enabling interoperability with .NET and other languages such as Java
Which is true about Transient objects?
exists as long as the server hosting the object
exists even if it is currently not contained in the address space of any server
a record stored in a database would be a transient object
most distributed computing platforms only support persistent objects
What is false about system wide object references?
Is a difference between Remote Method Invocation and RPC
Object references can be passed between remote processes
Process holding an object reference has to bind to the object before invoking any method
Binding results in a reverse pointer being placed in process’s address space
Which of the following is FALSE about .NET remoting
Supports UDP or TCP/IP
Supports SOAP and binary encoding
Similar to CORBA RMI
RMI call includes the object URI in the request
Which of these is not a .NET distributed computing platform
.NET Remoting
.NET Web Services
WCF (Windows Communication Foundation)
WCI (Windows Communication Interface)
