VPN(CCNP)

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VPN types:

1) Peer to peer VPN:

-like ary. CE connect to PE. PE-PE is transparent.

- L3 MPLS VPN

- routing protocol between PE and CE

2) overlay VPN

- end to end VPN or site to site VPN

- routing protocol end to end

- L2 mpls vpn or DMVPN

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Data security = IPSec

1) confidentiality

2) Integrity

3) authentication

4) anti-replay

Terms in IPSec:

1) SA: security association (a secure tunnel between 2 IPsec enabled endpoints)

2) IKE:

- IPsec uses Keys to create SA

- IKE is used to exchange those keys

DMVPN

- point to multipoint

- layer 3 overlay VPN

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