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000-253 exam is known as IBM Test253. IBM WebS.App.Svr.Ntwork Develoyment V6.1.Core Admn Exam, which is About IBM IBM certifications II
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The details of real 000-253 exam:
Duration: 105 minutes
number of questions: 108 questions
000-253 passing score: 66%-80%
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Exam : IBM 000-253
Title : Test253. IBM WebS.App.Svr.Ntwork Develoyment V6.1.Core Admn

1. Which services are implemented by the WebSphere application server?
A. Security, JMS messaging, Naming and HTTP Plug-in
B. The user registry, Naming and HTTP Plug-in
C. HTTP Load Balancing service, JMS messaging and Data Replication Service (DRS)
D. Security, Naming, Transaction and Dynamic Cache
Answer: D

2. Which two components provide workload management capabilities?
A. Node agent
B. Web server plug-in
C. Caching proxy
D. Deployment manager
E. Load balancer
Answer: BE

3. An application server is using data source connections being managed thru connection pooling. However, the server is logging database errors resulting from lack of connections. In this context, what applies to tuning database connections?
A. Data sources are abstracted from the JDBC drivers to permit database upgrades without impacting the application logic. The administrator should decrease the connection timeout value.
B. The connection pool is managed by the application server container, so in addition to increasing the connection setting, additional connections allowed must be configured on the database.
C. The data sources are released at the end of the commit phase when using Type 4 JDBC drivers. New connections will be created upon the next database access.
D. It is necessary to tune the applications before tuning WebSphere application server. Connections not returned to the pool are often caused by programs not closing connections properly.
Answer: D

4. What is needed to load balance the HTTP traffic across a cluster of Web servers?
A. Configure a proxy server such as Tivoli Access Manager (TAM)
B. Enable server affinity for each HTTP server in the cluster
C. Implement the caching proxy server component of the WebSphere Edge
D. Use an IP sprayer from the load balancing component of the WebSphere Edge Components
Answer: D

5. What functionality does the Caching Proxy server provide?
A. Reverse proxy and content-based routing
B. Dynamic content caching and integration with servlet caching
C. File serving enabler
D. HTTP compression
E. Integration with Dynacache and third party object caches
Answer: AB

6. If an administrator configures session management for an application server to use SSL ID tracking, which two other session tracking mechanisms should also be enabled?
A. Cookies
B. URL Rewriting
C. Security Integration
D. Serial Access
E. Java2 Security
Answer: AB

7. In a WebSphere cell configuration, which component is a single point of failure?
A. Deployment manager
B. Web container
C. EJB container
D. HTTP server
Answer: A

8. Which approach should be recommended when designing a production topology for WebSphere application servers providing high availability and failover capabilities?
A. Create a design using multiple machines that handle the full production load, enabling the use of application server clustering to provide failover capabilities
B. Utilize load balancers between the Web servers and the application servers to provide failover support at the application server tier
C. Place the Authentication servers outside of the intrusion firewall with the Web servers, since the Web servers will need to access them
D. Use the largest processor engines and least number of physical machines for the application server tier, to minimize the software licensing costs
Answer: A

9. Which set of parameters can a system administrator adjust to directly improve performance for the EJB container?
A. Transaction lifetime and client inactivity timeout
B. Cache size and cache cleanup interval
C. Data source connection pool and server JVM size
D. Session timeout and HTTP session object size
Answer: B

10. A cluster member has suddenly crashed. The administrator is concerned about aborted transactions holding locks in the database. What can an administrator do to release the locks?
A. Unmount the shared file system such as a Network Attached Storage (NAS) where the transaction log is stored
B. Restart the deployment manager and node agents who manage the transaction log
C. Verify another running cluster member has access to the transaction log
D. Reconnect the database where the transaction log is stored
Answer: C

11. Session Initiation Protocol (SIP) servlets are packaged in which type of archive file?
A. SAR
B. WAR
C. JAR
D. EJB-JAR
E. SIP-JAR
Answer: A

12. What does a WebSphere application server provide to support the installation and deployment of JSR 168 compliant portlets?
A. An embedded portlet container
B. A scaled-down version of the WebSphere Portal Server
C. Several J2EE applications that render and aggregate portlets in a browser
D. An embedded version of WebSphere Portal Express
Answer: A

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