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cisco npdesi dumps.EncryptionFigure 7-5 IPSec transport mode versus tunnel mode7.4.3 IKEv2 Protocol 1KE version 2 (IKEv2), defined in RFC 5996, improves the ability to perform dynamic key exchange and peer authentication. IKEv2 simplifies the key exchange process, introduces certain measures, and fixes vulnerabilities in IKEvl. Both the IKEvl and IKEv2 protocols operate in two phases IKEv2 provides a simpler and more efficient exchange.Phase 1 of IKEv2 is IKE_SA, consisting of the message pair IKE_SA_INIT. IKE_SA corresponds to IKEvl phase 1OIKE_SA phase attributes are defined in the key exchange policy o Phase 2 of IKEv2 is CHILD_SAO The first CHILD_SA is the IKE_AUTH message pair. This phase corresponds to IKEvl phase 2. additional CHILD_SA message pairs may be sent to reset the key and exchange information. The CHILD_SA attribute is defined in the data policy...... A The following shows the differences between IKEvl and IKEv2./ jfil says IKEvl phase 1 has two possible exchange modes: primary mode and active mode. IKEv2IKE_SA exchanges a message pair. IKEv2CHILD_SA phase simply exchanges two message pairs. IKEvl phase 2 exchanges at least 3 message pairs.7.5 SSLVPNSSL-based VPNs take full advantage of the SSL protocol. SSL (also known as Transport Layer Security [TLS]) is a protocol that has been in use since thea well-established protocol that has been in use since the early 1990s. The Internet I Process Task Force (IETF) created TLS with the goal ofConsolidate multiple vendor versions of SSL into a common open standard.