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cisco mpls book.firewall. Clients 1 and 2 are connected by SSLVPN and IPSeco Remote Access VPNs fall into the following two main categories.Clientless remote access VPNs: Users can connect without installing client software and typically use a Web browser to connect. The main advantage of clientless SSLVPN is that no client software needs to be installed on the PC, the main disadvantage is that only TCP-based applications are supported. Clientless SSLVPN is typically used for kiosks, shared workstations, mobile devices, and when users only want to encrypt Web traffic. Client-based remote access VPN: Users connect to the device (router, firewall, etc.) that terminates the VPN through client software. Cisco AnyConnect Secure Mobility Client is a VPN client software.7.4 IPSec OverviewIPSec uses the Internet Key Exchange (IKE) protocol to negotiate and establish secure site-to-site or remote access VPN tunnels. IKE is the framework provided by the Internet Security Association and Key Management Protocol (ISAKMP) and is part of two other key management protocols (the Oakley Protocol and the Secure KeyExchange Mechanism (SKEME) protocol).IKE is defined in RFC 2409, "TheInternetKeyExchange(IKE)", and IKE version 2 (IKEv2) is defined in RFC 5996, MInternetKeyExchangeProtocolVersion2(IKEv2) " o IKE is divided into two phases. Phase 1 is used to create a secure two-way communication channel between IPSec peers. This channel is called ISAKMP Security Association (SA)0 Phase 2 is used to negotiate IPSec SAO7.4.1 IKEv1 Phase 1 In the negotiation of Phase 1, the following attributes are exchanged. [cost point Encryption algorithm.Hash algorithm.Diffie-Hellman group. Authentication methods. Vendor proprietary attributes. Chapter 6 describes the basics of cryptography and the various encryption algorithms. Shown below are the encryption algorithms that are typically employed when deploying IPSecThe encryption algorithms used. Data Encryption Standard (DES): 64 bits in length. Triple DES (3DES): 168 bits in length. Advanced Encryption Standard (AES): 128 bits in length. AES192: 192 bits in length.