Which option describes the purpose of Diffie-Hellman?
A.
used between the initiator and the responder to establish a basic security policy
B.
used to verify the identity of the peer
C.
used for asymmetric public key encryption
D.
used to establish a symmetric shared key via a public key exchange process
Explanation:
http://www.cisco.com/en/US/docs/routers/access/cisco_router_and_security_device_manager/25/
software/user/guide/IKE.html
D-H Group
Diffie-Hellman (D-H) Group. Diffie-Hellman is a public-key cryptography protocol that allows two
routers to establish a shared secret over an unsecure communications channel. The options are as
follows:
•group1—768-bit D-H Group. D-H Group 1.
•group2—1024-bit D-H Group. D-H Group 2. This group provides more security than group 1, but
requires more processing time.
•group5—1536-bit D-H Group. D-H Group 5. This group provides more security than group 2, but
requires more processing time.
Note•If your router does not support group5, it will not appear in the list.
•Easy VPN servers do not support D-H Group 1.