I have this problem too.
Correct Answer by Brandon Buffin about 6 years 6 months ago
You would need to pass 642-892 AND 642-873. Keep in mind that the last day to take 642-892 is July 31, 2010. After this you will need to pass 642-902 ROUTE, 642-813 SWITCH and 642-873 ARCH.
Hope this helps.