Yes, If you take 642-742 (or in fact any 642-xxx) your current CCNP status should renew (see below). But problem for you is to do that exam, you need to have CCNA Wireless as prerequisite.
http://www.cisco.com/web/learning/certifications/professional/ccnp/index.html#~Recert
Cisco Professional-level certifications (CCNP, CCNP Wireless, CCDP, CCSP, CCNP Security, CCNP Voice, CCIP, CCNP Service Provider, CCNP Service Provider Operations, and CCNP Data Center) are valid for three years. To recertify, pass ONE of the following before the certification expiration date:
- Pass any current 642-XXX Professional-level or any 300-XXX Professional-level exam, or
- Pass any current CCIE Written Exam, or
- Pass the current CCDE Written Exam OR current CCDE Practical Exam, or
- Pass the Cisco Certified Architect (CCAr) interview AND the CCAr board review to extend lower certifications
When using a higher level of certification to extend other certifications, the expiration date of other certifications will extend to the expiration date of the higher certification (i.e.: If you have one year left on your CCNA certification and you earn a CCIE certification (which has a two-year certification life) then both your CCIE certification and your CCNA certification will expire two years from the date you achieved the CCIE certification)
So better do any CCNP R&S module in this case.
HTH
Rasika
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