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Simon Lee's Mock Exam

herve attia
Ranch Hand

Joined: Sep 28, 2001
Posts: 138
Hello Folks,
I would like to invite you to look at these questions and my answers to the Simon Lee Mock Exam (http://www.x-nt.com/questions.html).
Some of my answers are not guarantee!!
We need to work together on these questions because most of them are in the real exam !!!
Simon Lee is free to give its advices :-)
Regards,
Herve Attia

==========================================================
Question 1
What is new feature in Java 2 security? (select one)
1. protection domain
2. Access Control List
3. digital signature
4. message digests

answer : 1 Protection domain is new in Java2
Question 2
Normal lifecycle of a java application are
1) Problem Statement
2) OO Desgin
3) implementation
4) java app architecture
5) OO analysis
in what order? (select two)
1. 12345
2. 45213
3. 51423
4. 15423
5. 15243

answer 4 problem statement -> OO analisys -> OO design -> Java app architecture -> implementation

Question 3
What is EJB's primary purpose? (select one)
1. Middleware independence
2. Platform independence
3. Language independence
4. Allow user to build middleware
Well, tricky question...all sounds correct....
I will say the most suitable answer is 4 ?!
help !!

Question 4
What most accuratly describes the feature that JAVA 2 security provides? (select one)
1)Browers admins and users can grant access to websites and individuals to have system privileges
browsers grant access to websites and individuals to have system privileges
2) Browser admins and users can grant access to individual classes to have system privileges
answer : 1

Question 5
How do you find the origin of an applet (in JDK 1.0, 1.1 and 1.2)?
1) digital signatures.
2) Host name IP
All a signature tells you is who signed the code !!
So, the suitable answer is 2 .....
Question 6
How can hierachical databases be accessed?
1) JDBC
2) JNI
3) JTAPI
4) Object/relational mapping
5) JavaBlend
What a good question that you might have at the real exam !!!
Let's process by elimination :
Javablend is no longer marketed by Sun Microsystems.
JTA is the Java API for telephony call control.
A hierarchical model was this old thing from back in the 60s that only survives in legacy systems.
Since the data are not stored using the relational model we can hardly use an object-relational mapping.
...And find a JDBC driver must be hard as well.
JNI is a standard programming interface for writing Java native methods and embedding the JVM
into native applications...must be the winner of these tricky questions.
Any advices to my answer will be appreciated !!

Question 7
What are X.509 certificates?
Certificates are digital documents attesting to the binding of a public key to an individual or other entity.
They allow verification of the claim that a given public key does in fact belong to a given individual.
certificates contain a public key, name, an expiration date, the name of the certifying authority ...
Most importantly, it contains the digital signature of the certificate issuer.
The most widely accepted format for certificates is X.509.

Question 8
How does applet printing in 1.2 differ over 1.1

Since the applet is untrusted (sandbox)
we know that trying to print to client is out of the question.
With 1.2 a applet trusted and signed can print to the client.

Question 9
What does a good software architecture increase? (Choose the best answer)
1) robustness
2) scalability
3) complexity
4) maintenance
I guess a good software architecture should increase scalability.
If the load increases, it might affect Robustness.
Question 10
You are asked to convert an existing two-tier client-server application
interacting with Oracle database to java.
What input is most needed to study feasibilty of that project in java? any one.
1) er diagram (Entity-Relationship diagram)
2) application design
3) application code
4) list of gui objects
1, 2, 3, 4 Help !!
Question 11
SSL. what does it encrypt? (choose one)
1) all tcp data but not TCP, IP or physical headers
2) physical data but not headers
3) ip data and not header
4) specific application fields but not protocol messages
My SSL understanding is that SSL provides a secure communication between client and server over TCP sockets,
by allowing mutual authentication, it uses digital signatures for integrity, and encryption for privacy.
As SSL sits on top of TCP/IP, means that parts of the message used by TCP/IP should be un-touched by encryption.
TCP/IP does not know anything about SSL !!
so, I will answer 4).
Question 12
What is OQL?
1) ad-hoc query standards for ODMBS.
2) Proprietary language to query ODBMS
OQL is a database query language that is based on SQL. OQL is an object variant of SQL3.
Proprietary is not an "open standard" word so answer 1 is suitable !!

Question 13
How can an EJB component access a mainframe transaction processing system? (choose one)
1) Container that provides transaction processing
2) Container that provides database access
the most suitable answer is 1. I think the EJB container should access a mainframe transaction using transaction monitor/manager services....any clues ?

Question 14
What is logging used for? (choose one)
1) tracking the activity of an individual
2) identifies an individual
3) determine the identity of an individual
I don't really understand the difference between 2) and 3) ?!
Logging is a mechanism to authentificate an individual. So, either 2) or 3)

Question 16
How does a client locate an EJB instances? (choose one)
1) through JNDI
2) through RMI
3) through a home interface
4) through a remote interface
answer 1 : we use JNDI to lookup an EJB Home interface.
Question 17
What two must be taken care of to ensure successful transition from development to production? (choose two)
1) Test on all web browsers and users
2) Use latest JDK
3) async communication between tiers
answer : 1 , 2 ?!
Question 18
When would you use synchronous communication between Java architecture layers?
1) When the client needs to wait for an response
2) When the client doesn't need to wait for a response
3) When the network is not available
answer : 1
Question 19
What protocol will an applet use to communicate with a servlet?
1) sockets
2) RMI
3) HTTP
4) IIOP
answer : 3 Servlet is a request/response mechanism
Question 20
What must be taken care of during testing an Internet application from dev to depl on Intranet?
1) Test thru firewall
2) test with the slowest part of the n/w
3) load compatible jvms on client platforms
4) test in an isolated subnet

1, 2, 3 ...any clues ?
answer :
Question 21
What does EJB propose to solve? (choose one)
1) Middleware independence
2) Platform independence
3) Language independence
4) Enables client to write Java middleware
answer 1 ...but I'm confused.
Question 22
When must you use async comm.? (choose one)
1) in a publish subscribe arch
2) when the network is reliable
3) when the network must be available
4) When you are developing transaction processing application

answer : 1
Question 23
What is the function of subscribe in publish/subscribe arch.? (choose one)
1) registers interest in an event
2) publishes to the arch.
3) subscribes to the architecture
answer 1
Question 24
Two advantages of publish/subscribe arch. (choose two)
1) it is scalable
2) allows decoupling of publishers and subscribers
3) it is fully object oriented
4) it is reusable
2, 3
Question 25
When should you use HTTP with java. (choose one)
1) When using only object references.
2) Through a firewall
I don't really get it the question.
HTTP is a communication protocol. How can it be related to object reference ?
So, I will answer 2 because we can use HTTP Tunneling mechanism to wrap another protocol and go
through a firewall.
Question 26
What is DMZ? (choose one)
1) A secure buffer between the the internet and intranet.
2) A semi-secure buffer between the internet and intranet.
3) A unsecure buffer between the internet and intranet.
answer 1
DMZ (demilitarized zone) is a computer host or small network inserted as a "neutral zone"
between a compagny's private network and the outside public network (internet)
Question 27
In a 2-tier scenario with client talking SQL to Oracle database given the customer requirements,
what additional information is required to decide the feasibility of whether app
can be migrated to java or a new application written:
1) Application design
2) ER diagram of database schema
answer: 1 ?

Question 28
Given a UML notation representation: a rectangle with var:Order (underlined) inside it?
1) an active "Order" object
2) instance of "Order" object
3) package containing "Order" object
4) node containing "Order" object
"var:Order" var is the instance name and Order is the classname.
A rectangle corresponds to a single instance.
Instance names are underlined in UML diagrams (see Object diagrams, collaboration diagrams).
answer 1, 2

Question 29
In both CORBA and RMI, a cause for large network traffic might be? (select most suitable answer)
1) NV lists
2) App data
3) Object wrappers
4) Object references

too much object reference in the client side increases round trip with the server.
4 might be a suitable answer ?!

Question 30
Given a scenario of an existing application with 2 tier fat client accessing Oracle db through SQL,
It may be less feasible to migrate to java if? (Choose the most suitable answer)
1) Volatile client app
2) Multiple client platforms
3) Experience in 4GL
4) Experience Database design
5) Experience in Smalltalk
I will answer 4) ?!

Question 31
What are two advantages of publisher/subscribe?
1) scaleable
2) reusable
3) object-oriented
answer 2, 3

Question 32
Applet performance benchmarks?
Jperf.
Question 33
With respect to servlet which of the following are true?
1) Servlet can not access other Java objects on the server in which it resides
2) Servlet resides in the client
3) Servlet is multithreaded by default
4) Servlet is a request/response mechanism

answer : 3, 4
Question 34
A entity EJBObject class of an EJB implements
1) SessionBean
2) EntityBean
3) EJBHome
4) EJBObject

answer 2 javax.ejb.EntityBean

Question 35
Facade pattern is best described as
1) The complex logic underlying is hidden in the (published) interface
2) To execute a chain of command in any order 4) To log the client interactions
answer: 1
Question 36
What duties are performed by a Java Architect? (choose three)
1) Take an existing system to production
2) Define requirements for a new system
3) Develop a project plan which might include recommendations for training and mentoring the customer's staff.
4) Write stubs.
5) Evaluate a proposed architect put forward by a client.
2, 3, 5

Question 37
Where does a architectural design fit into the application development lifecycle.
Between object-oriented analysis and object-oriented design.

Question 38
On whathat port number will you find HTTPS
1) 80
2) 81
3) 443
4) HTTPS uses named pipes
answer 3
http = 80
https= 443
iiop = 535
jrmp=1099
Iyengar Srividya76
Ranch Hand

Joined: Sep 09, 2001
Posts: 87

Thanx Herve...
This is indeed a real good job....
Vidya
SJ Adnams
Ranch Hand

Joined: Sep 28, 2001
Posts: 925
Question 2: you need to select the best 2
Question 5: The host IP may be spoofed, its in the sig ??
Question 6: Its JNI I think
Question 11: Don't think it's 4 more likely to be 2?
Question 20: 3 is best answer
Question 26: DMZ is semi-secure.
Question 34: EJBObject surely?
Question 38: Where did you find out IIOP is 535? I have 683?
I think you are ready for the REAL test Herve!!!
------------------
http://www.x-nt.com
herve attia
Ranch Hand

Joined: Sep 28, 2001
Posts: 138
Originally posted by Simon Lee:
Question 2: you need to select the best 2
Question 34: EJBObject surely?
Question 38: Where did you find out IIOP is 535? I have 683?

Q34: A entity EJBObject class of an EJB implements
1) SessionBean
2) EntityBean
3) EJBHome
4) EJBObject
Maybe I was fool by these question.
An remote interface as we know extends javax.ejb.EJBObject or
javax.ejb.EJBHome.
But here , the question uses the "implement" word.
An entity bean implements javax.ejb.EntityBean...
Tricky question !!

Q38 : refer to http://www.certificationguru.com/javatutorial/j2eeProtocols.html
Regards,
Herve
SJ Adnams
Ranch Hand

Joined: Sep 28, 2001
Posts: 925
it's www.x-nt.org & fallen into a bit if disrepair now im afraid :/
Thomas Taeger
Ranch Hand

Joined: Dec 16, 2002
Posts: 309
Originally posted by herve attia:

Q34: A entity EJBObject class of an EJB implements
1) SessionBean
2) EntityBean
3) EJBHome
4) EJBObject
An remote interface as we know extends javax.ejb.EJBObject or
javax.ejb.EJBHome.
But here , the question uses the "implement" word.
An entity bean implements javax.ejb.EntityBean...
Tricky question !!

Hi Herve,
I wunder what an "entity EJBObject class" might be, and I therefore would not be able to answer Q34.
Extending EJBObject marks the remote interface.
This remote interface then will be implemented by the EJB container.
Your bean class MUST NOT implement EJBObject nor EJBHome itself.
So the "entity EJBObject class" could only be the wrapper class generated by the EJB container according to the interfaces.
4) And this wrapper class then would implement EJBObject, may add some transactional code like commit() and forward wrapper.methodCall() to MyBean.methodCall() .
1) Interface Session... is off the topic Entity... .
2) Interface EntityBean is implemented by MyBean, but MyBean is no "entity EJBObject class", only the wrapper is.
3) Interface EJBHome is implemented by the container (forwarding MyBean.ejbCreate() to MyHome.create() etc.).
If the question allows multiple checkboxes to be checked, I would check none.
If the question must be answered by a radio button, I would check 4).
Or there is no "entity EJBObject class" at all that could implement anything, and the question Q34 would be nonsense? Extremly tricky? No, just a bad question.
Or should "entity EJBObject class" just mean "entity EJB class"?
Hmmmm...
Thomas.


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Interfaces are the glue of OO.
Michael Zhao
Ranch Hand

Joined: Sep 19, 2000
Posts: 77
up


SCJP,SCWCD,SCMAD,OCP9I, SCEA
Dan Drillich
Ranch Hand

Joined: Jul 09, 2001
Posts: 1180
Herve,

About Question 3:

http://www.developer.com/java/article.php/1435271 says:

The primary purpose of an EJB is to deliver business or application logic.


It means to me, as you said, that answer #4 is right - Allow user to build middleware.

Regards,
Dan


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