To obtain the GCWN cert, you must either take and pass the SANS GSEC or supply an alternative, acceptable credential. It just so happens that the CISSP is recogized as such an alternative, and it also happens that the CISSP is better recognized and more frequently requested by name than any other security cert. Thus, you might be best served by pursuing both!
For more information on this topic, visit these other SearchSecurity.com resources:
Careers and Certification Tip: The CISSP
Ask the Expert: Qualification assessment for the CISSP
Ask the Expert: Entry-level certs prior to CISSP
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