Type of VPN's

Deployment classification

1. Site to Site VPN
2. Remote VPN

Classification based on OSI layers

1. Layer 4/7 VPN - WebVPN
2. Layer 3 VPN - IPSec, GREoIPSec
3. Layer 2 VPN - L2TP, PPTP, MPPE

Classification based on trust level

1. Intranet VPN
2. Extranet VPN
3. Remote VPN

Customer point of view classifications

1.   Traditonal VPN

• Frame-relay (L2 VPN)
• ATM VPN (L2 VPN)

2.   CPE based VPN

• L2TP and PPTP (Layer 2 VPN)
• IPSec VPN (Layer 3 VPN)

3.  Provider Provisioned VPN

• BGP/MPLS (L2/L3 VPN)

4.  Session based VPN

• SSLVPN/WebVPN (L4/L7 VPN)

Cisco Site to Site VPN

1. IPsec VpN

2. Easy VPN

3. Dynamic Multipoint VPN (DMVPN)

4.Group Encrypted Transport VPN (GET VPN)

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6635/ps7180/prod_brochure0900aecd80582078.pdf

Cisco Options for Remote VPN
1. IPsec VPN
2. SSL VPN
other options L2TP, PPTP, MPPE