Hi answer to ur first query is yes all the 3 modes of cisco ssl vpns are supported on cisco asa as well as on cisco ios routers.
2)yes ssl vpn load-sharing is supported on asa but it is as of now not supported on cisco ios routers.
3)using ssl vpn on asa is advantageous over ios routers in terms of failover of the ssl connections, u are getting stateful firewalling of the ssl connections , u can integrate anti-virus and ips scanning of packets coming in by the ssl connections.
4)the answer to ur fourth query is about posture validation and remediation. u want to enforce policies on the hosts depending whether they are coming from a secure connection or not. for this u will need the cisoc nac solution for the vpn users. where the users will the validated and checked for the company policies and allow them that of access.
5)the cisco secure desktop is a software which is either installed on the ssl clients or they are downloaded into them once they are connnected and authenticated to ssl vpn gateway. with the cisco secure desktop all the activities the user is doing after connected to the ssl gateway will be stored in a virtual drive created by the software and all the cookies and other information realted to the ssl connection will be stored in there. and once the connection is terminated it will be erased as per DOD standards . so it makes very much sense to use them when users are connecting from public places like cyber cafes and free wifi spots.
i hope i am able to answer ur queries to knowledge i have on these domains.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...