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See http://csrc.nist.gov/publications/nistpubs/800-113/SP800-113.pdf from NIST.
Can I connect to Stanford university using SLAC VPN?
Stanford university is using different VPN protocols and technologies, so the SLAC VPN client can't be used to connect to Stanford through VPN. But when connected to SLAC VPN you can reach Stanford ressources as if you were in your office at SLAC.
If you are a SLAC employee/user willing to access SLAC ressources you should use SLAC VPN, if you are a Stanford university employee/student you should use the Stanford VPN client provided on http://itservices.stanford.edu/service/vpn.