Welcome to the Java Architect's Corner!

The key to a strong performance in the Enterpise Architect certification is the thorough familiarity with J2EE and boatloads of common sense. If you have worked as a Java Developer you would presumably be savvy with the basics of the J2EE building blocks like Servlets, JSP, JMS, and JDBC to name a few. If that is not the case then one should wonder on how you managed to get this far!!

You can expect to find several application scenario's like an online store with a webserver, application server and database (all behind a firewall). And be asked to look into architecture issues in a B2C or B2B context.
Which transactions to secure?
What is the effect of adding web servers?
What are the mechanisms used to load balance?
What are the implications of load balancing on state management?

Here are links to some really good websites from where you can weave a web to gather more specific information. Start with...
Sun's Official Java Architect site.Also be sure to go through the success guide (PDF).

J2EE documentation
Java 2 Platform, Enterprise Edition Blueprints
Java 2 Platform, Enterprise Edition Sample Application

Specifications
Java 2 Platform, Enterprise Edition Specification
Enterprise JavaBeans Specification
JavaServer Pages Specification
Java Servlet Specification
Java Naming and Directory Interface Specification, Version 1.2.1
Java Message Service Specification, Version 1.02

Resources
Nice Mock Exam.
SCEA Part-I Mock Exam.
Great resource for links to related sites.
Great site for information on Sample Exam, DNS, Firewalls etc.
SCEA Study Guide
Java Design Patterns

J2EE (and related) Practice Tests
Prasks mock exam
Amit Jnagals mock exam
IBM Ice Test (Test 483)
Sun Practice Test
Sun EJB Quiz
Sun Security Quiz
Sun JSP Quiz
Sun Performance Quiz
Sun Advanced Programming Quiz
Sun JDBC 2.0 Quiz
Jawroski Exam (Old format!)

Good Luck!