Upside: message switching is extremely flexible.Message switching: when the data takes multiple stops (hops) to get from its starting point to its end point.Now that we have split up the network, data may take multiple stops to arrive at its final destination.Things get trickier when more and more computers get added to the network.When traffic increases, two computers may try to send information at the same time.Computers listen for the their address for the header.Each computer has a unique MAC (media access control) address, and when a computer sends out data, the data is prefixed with the MAC address in a header.The most successful early LAN technology was Ethernet, introduced by Xerox in the early 1970s.This network is called a LAN, a local area network.These computer networks were physically close and connected by coaxial cables.
Some of the first computers networks started in research facilities. Quick note: sometimes words are mentioned before they are defined. How the series of tubes that make up the internet actually work I looked into some of these concepts, and lo and behold there was a pattern. I compiled a list of words and acryonyms that keep popping up, but were not integral to my work. No one can understand everything, there just isn't enough time. There are a bunch of moving parts in order to get a website up and going. Matcher m = p.matcher((String)attrs.get("boilerkeyauthtime")) Ĭal.set(Calendar.YEAR, Integer.parseInt(m.group(1))) Ĭal.set(Calendar.MONTH, Integer.parseInt(m.group(2)) - 1) Ĭal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(m.group(3))) Ĭal.set(Calendar.HOUR_OF_DAY, Integer.parseInt(m.group(4))) Ĭal.set(Calendar.MINUTE, Integer.parseInt(m.group(5))) Ĭal.set(Calendar.SECOND, Integer.parseInt(m. Public class RequireBoilerkeyFilter implements Filter )$") Import .authentication.AttributePrincipal Servlet filter code example (untested, please let us know if something needs changed) package MinutesBeforeRequiringBoilerkeyReauthentication util.HttpServletRequestWrapperFilterĮdu. validation.Cas20ProxyReceivingTicketValidationFilter If user is already authenticated to CAS, but not with BoilerKey, or if BoilerKey authentication is too old, invalidate the web container session and redirect the user to. Successful CAS ticket checks return an additional attribute boilerkeyauthtime, which has a format that looks like. Use a slightly different CAS server login url:. Most deployments should be able to use a standard CAS client, with a few tweaks outlined here. The Purdue CAS server deployment supports the use of BoilerKey for authentication.
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