Aqui tem varios exemplos de VPN:
http://www.cisco.com/en/US/products/sw/secursw/ps2308/prod_configuration_examples_list.html
Este link não é da Cisco mas também tem varios exemplos legais:
http://www.dslreports.com/faq/14243
No seu caso, acho que estes dois links são os mais recomendados:
http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a0080194650.shtml
http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a0080094685.shtml
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CCNA / CCDA
Cisco Data Center AS Support Specialist;
Cisco Data Center Support for UC Specialist;
Cisco Routing and Switching Field Specialist;
Cisco Unified Fabric Technology Support Specialist;
Cisco Unified Computing Technology Support Specialist
Cisco Data Center Unified Computing Support Specialist;
Cisco Data Center Storage Networking Support Specialist;
Cisco Data Center Application Services Support Specialist;
Cisco Advanced Data Center Networking Infrastructure Support Specialist;
CCNP / CCIP / CCDP
ITILF v2 / ITILF v3
CCIE SP #34881
CCIE RS Written
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Mind Wide Open