Layer 3 Tunneling CIsco CCSP Training Institute in Delhi Gurgaon

Network Bulls
www.networkbulls.com
Best Institute for CCNA CCNP CCSP CCIP CCIE Training in India
M-44, Old Dlf, Sector-14 Gurgaon, Haryana, India
Call: +91-9654672192

Two methods exist for tunneling private networks over a public IP network:

• Generic Routing Encapsulation (GRE)— Developed by Cisco to encapsulate a variety of protocols inside IP tunnels. This approach is simple for basic IP VPNs but lacks in security and scalability. In fact, GRE tunnels do not use any encryption to secure the packets during transport.
• IP Security (IPsec)— IPsec provides secure transmission of data over unsecured networks such as the Internet. IPsec operates in either tunnel mode or transport mode. Packet payloads can be encrypted, and IPsec receivers can authenticate packets' origin. Internet Key Exchange (IKE) and Public-Key Infrastructure (PKI) can also be used with IPsec. IKE is the protocol used to set up a security association (SA) with IPsec. PKI is an arrangement that provides for third-party verification of identities.