Currently Being ModeratedDec 3, 2013 9:54 AM (in response to dalal.krishnakant)
You set up your client for VPN access using System Preferences (under the Apple menu) > Network.
Create a new connection by clicking the "+" button in the lower left corner. In the resulting dialog, set Interface to VPN and VPN Type to Cisco IPSec. Click the Create button.
Select the new VPN connection from the list. Enter the Server Address, Account Name, and Password. Click the Authentication Settings... button and enter the required information.
DNS Servers should be entered after clicking the Advanced... button.
When all settings are entered, click the Apply button.
Test the set up by clicking the Connect button.
You may want to check the Show VPN status in menu bar checkbox. This lets the user connect immediately from a menu without having to go to through System Preferences.
Best of luck.