Which of the following are true about Active Replication? A It is a fault-tolerance mechanismB It is achieved by taking cold back upsC Each replica attempts to process each request but extra calls may be intercepted via an interceptorD
Choices A, C and F are correct. Active Replication is a fault tolerance mechanism where each replica is identical to the main service and attempts to service each request. An interceptor is used to
Which of the following are benefits of Server Clustering? A ReplicationB High SecurityC Easy ManageabilityD Load BalancingE
Choices A, D and E are correct. Through the use of replicas, server clusters increase the reliability and availability of a system. They provide a fault tolerance mechanism with load distribution
CORBA is a standard for A Messaging using virtual channels called QueuesB Standardized development practicesC Messaging using virtual channels called topicsD Accessing distributed object
Choice D is correct. Common Object Request Broker Architecture (CORBA) is a standard for distributed communication involving applications written using different languages. Hence choice D is
RMI-IIOP does not provide which of the following capabilities? A Remote Method InvocationB Stub DownloadsC Objects pass by value (state only)D Distributed Garbage Collection
Choices B and D are correct. RMI-IIOP does not support Stub downloads and distributed garbage collection. Hence choices B and D are correct.Both Remote Method Invocation and Objects pass by
Which of the following are not true about Screen Scrapers? A Screen scrapers function as Terminal Emulators on one end and as Object Interfaces on the other.B Screen Scraping may be a useful tool when used in conjunction with the off-board servers.C Changes to
Choices C and D are correct. When using screen scrapers, any changes to the legacy user interface will also affect the new GUI. Also screen scraping is the best alternative only if the existing
Which of the following is not a resource management technique? A Maintaining a smaller pool of Stateless Beans to serve a large number of clients.B Providing Database Connection PoolingC Persistence of Entity BeansD
Choice C is correct. Persistence of Entity beans is the ability to save data represented by the bean into a database. It is not a resource management technique. Choice C is false and therefore
HTTP is A Connection LessB Connection BaseC StatefulD StatelessE Secure
Choice B and D are correct. HTTP (HyperText Transfer Protocol) is a transport mechanism for MIME (Multipurpose Internet Mail Extensions) documents. MIME documents often contain HTML (HyperText
Asynchronous communication is achieved by using: A Remote Procedure CallsB RMI/IIOPC Message Oriented MiddlewareD CORBA
Choice C is correct. Message Oriented Middleware or MOM is used for asynchronous messaging between applications. Most popular implementations support Point to Point (one to one) and Publish
Which of the following is not part of the Messaging architecture: A Decentralized messaging using IP MulticastingB Decentralized messaging using Secure Sockets Layer (SSL)C Use of virtual channels called QueuesD
Choice B is correct. Only choice B is not a standard paradigm in messaging architecture. Hence choice B is correct.IP Multicasting can be used as a technique for decentralized messaging. Queues
In P2P, clients send messages to: A A designated queueB Multiple QueuesC A specific node for redistribution to subscribersD CORBA compliant ORB
Choice A is correct. P2P or Point to Point messaging is used for one to one communication between two components or applications. In the P2P model, message producers send messages to a designated
