X.25 is packet based switching and indeed is very similar to Frame Relay which was a development of it. The principle difference is that it was used at a time when links were more prone to errors and therefore has far greater error correction abilites both at the link and network layers. The downside to this is of course the considerable overhead that is added to the data.
Its still used in places but they are mostly legacy or niche applications such as X.25 over ISDN D channels. Security is no different to Frame Relay.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
The LAN gateway performs NAT and there was a dedicate nat rule for the host i wanted to reach through VPN.
I couldn't connect to the hos...
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...