Hi Xin,
SCWCD 1.3(CX-310-080) is based on
J2EE v1.3, which uses
servlets v2.3 and
JSP v1.2.
Tomcat v4.x is based on these specifications.
SCWCD 1.4(CX-310-081) is based on J2EE v1.4, which uses servlets v2.4 and JSP v2.0 (the latest final specs). Tomcat v5.x is based on these specifications.
SCWCD 1.4 upgrade(CX-310-082). This exam is for people who have already taken SCWCD 1.3 and wish to update their existing cert status to J2EE 1.4. If you have not taken CX-310-080, then
you should ignore this option.
Does that help? If you have not taken any of these exams, then I would recommend that you take SCWCD 1.4, but please understand Sun's policy is that these certs never become invalid, but they do get "old". Make sense?
HTH,
Bryan