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
Which of the following are true about Passive Replication? A Primary Service and all replicas respond to all requestsB Primary Service randomly delegates requests to one of the secondary replicasC Primary service handles all requestsD
Choices C, D and F are correct. In Passive Replication, the primary service handles all requests. The state of the replicas is periodically synchronized. In the event that the primary service
Which of the following are true about Active Replication? A It is a fault-tolerance mechanism B It is achieved by taking cold back ups C Each replica attempts to process each request but extra calls may be intercepted via an interceptor D State changes are logged and periodically flushed to the replicas E State is synchronized only when the primary service fails F Each replica is identical to the main service.
Choices A, C and F are correct.
Which of the following are benefits of Server Clustering?A Replication B High Security C Easy Manageability D Load Balancing E Fault Tolerance
Choices A, D and E are correct.
Which of the following are true about Passive Replication? A Primary Service and all replicas respond to all requests B Primary Service randomly delegates requests to one of the secondary replicas C Primary service handles all requests D State is periodically synchronized between the Primary service and all replicas E It is similar to hot backup F It is similar to Warm Backup
Choices C, D and F are correct.
What is the difference between Stateful session beans and stateless session beans?A Stateful session beans are pooled and Stateless session beans aren’t. B A Stateful session bean can persist its state through a server crash but a Stateless session bean can’t. C A Stateful session bean can remember its state with a client, like a conversation but a Stateless session bean can’t. D A Stateful session bean uses a Primary Key interface to maintain persistence.
Answer: C
What is the difference between stateful Session beans and Entity beans? A Stateful session beans can survive a server crash but Entity beans can’t. B Entity beans can survive a server crash but Stateful session beans can’t. C Session beans are typically used to make calls on Entity beans. D Entity beans are typically used to make calls on Session beans.
Choices B and C are correct.
What’s the biggest difference between Message-Driven Beans and Entity and Session Beans?A There is no difference in structure between Message-Driven Beans and Entity and Session Beans. They all have Home, Remote interfaces and a bean class. B Message-Driven beans don’t have a Home interface. C A Message-Driven bean is different from Session Beans because its state is persisted. D Clients don’t access Message-Driven beans through interfaces.
Choices B and D are correct.
Your have been contracted by a company to help them improve the performance of their sales application. You have suggested that the hardware the application is currently deployed on (2 web servers and a database server) be migrated to 3 web servers, an application server and a database server (all on different machines.) You assure them that all the software re-writes needed will be well worth it in the end. What are the characteristics of your suggested architecture?A Fat Clients B Thin
Choices B, C and D are correct.
