cisco online certification

cisco online certification. Ubiquitous: The popularity of SSL/TLS enables VPN users to remotely access their unit's intranet resources from any PC, anywhere, without the need for pre-installed remote access VPN client software.Reduced management costs: Because there is no VPN client software to install, there is no cost to deploy and maintain this remote access VPN on the end-user side. This is of great benefit to IT administrators, as there is no need to spend a lot of effort deploying and maintaining a remote access VPN solution.Effectively circumvent firewall and NAT device blocking: SSL VPN and HTTPS both use the same TCP destination port number (443). Most Intemet firewalls, proxies and NAT devices are already configured to properly handle TCP traffic with a destination port of 443. Therefore, no special configuration is required to allow SSL VPN traffic to traverse the network. This is an important advantage over pure IPSec VPNs that operate at the IP layer (ESP and AH with IP protocol type field values of 50 and 51, respectively), which in many cases require special configuration on the firewall or NAT device for IPSecVPN traffic to pass through.To meet another important requirement for remote access VPNs (the need to support any application), SSLVPN is still evolving.evolving, and some of these attributes are no longer applicable, depending on the SSL VPN technology chosen by the VPN user. But in general.These attributes have not only been the main drivers of SSLVPN's popularity in recent years, but have also been heavily promoted by SSLVPN vendors as a replacement for IPSec.promoted as the primary reason for replacing IPSecVPN.Today's SSLVPN technology uses SSL/TLS to securely transport data, employing various remote access technologies (such as billing points, reverse proxies, tunnels, and terminal services) to provide users with a wide variety of access methods suitable for various network environments. Some common SSLVPN technologies are described later in this chapter, as follows.Reverse proxy technology oport-forwarding technology and smarttunnel o