CCNA Security 640-554 Quick Reference by Anthony Sequeira

By Anthony Sequeira

With this record as your consultant, you are going to overview subject matters on enforcing Cisco IOS community safeguard. This fact-filled fast Reference helps you to get all-important info at a look, assisting you to concentration your examine on parts of weak point and to reinforce reminiscence retention of crucial examination thoughts.

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Cisco provides four methods to implement AAA: ■ Self-contained AAA using the local database ■ Cisco Secure Access Control Server (ACS) for Microsoft Windows Server ■ Cisco Secure ACS Express (entry-level version appropriate for 350 users) ■ Cisco Secure ACS Solution Engine (rack-mountable hardware version) Local Authentication Using the local authentication method, the user connects to the router, the router prompts for a username and password, and then the router authenticates using the local database.

58 ] Chapter 4: Site-to-Site VPNs Digital Signatures Digital signatures are often used in the following situations: ■ To provide a unique proof of data source ■ To authenticate a user by using that person’s private key, and the signature it generates ■ To prove the authenticity and integrity of PKI certificates ■ To provide a secure time stamp The following steps indicate how digital signatures function: STEP 1. A user wants to sign some data. The user uses a signature algorithm with a personal signature key; only the signer knows this signature key.

4. Ensure that existing access lists are compatible with IPsec; use show access-lists. Configure an ISAKMP policy to determine the ISAKMP parameters that will be used to establish the tunnel. Use the crypto isakmp policy command to define an IKE policy. Define the IPsec transform set. The definition of the transform set defines the parameters that the IPsec tunnel uses and can include the encryption and integrity algorithms. Use the crypto ipsec transform-set global configuration command. Create a crypto ACL.

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