Honestly think about whether it applies to your job anymore. If not, step up to a higher certification as the other guys mentioned.
Personally, I'm not retaking my test when it comes up in November since it has absolutely no bearing on what I do these days.
If you're just looking to keep one more cert on your resume, then re-do it, but honestly after 4 years of networking you should be thinking about having something more specialized in hand as the cert will carry far less weight than your real world experience and any competent interviewer will see that.
Not to mention it's sad that the cert is being diluted by the number of #$@*#$@ who scam their way through it. Ridiculous.
Cheers,