> At 03:56 PM 5/21/02, Thompson Alton wrote: > >Do you remember Mainframe systems??? > > Yes. (And if you were asking Howard, the answer is emphatically YES ;-)
HeHe! Heck I was doing some file transfer troubleshooting on a Mainframe towards the end of last year, I got elected because I knew the switches, routers, lan/wan protocols, sniffers, nethealth, openview and somehow I recalled some of the MVS things I did 15 years ago. The mainframe people on both sides of the circuit were blaming it on the network, and our main MVS guy was going on vacation for a couple of weeks. I was able to prove that it was an MVS application problem. The main point here is that there is a heck of a lot more to think about when running a network than to worry about what the cisco equipment is doing. > > >Do you remember LU and PU and logic > >controllers?? > > Yes. > > >Do they all work the same as IP networks or VOIP and IP > >telephony networks? > > Yes, pretty much. Networking 30, 20, 10 years ago dealt with the same stuff > we're still dealing with today: > > layers > cables > wireless (not as much as there is now, but definitely some) > circuits (both virtual and real) > connectionless versus connection-oriented > reliability versus low overhead > connection establishment and teardown > flow control > windowing > packetization > signaling > error detection > error correction > ACKs and NACKs and WAKs (WAKs kind of fell out of favor) > dynamic and static addressing > dynamic and static routing > pesky users > security (although the old-timers should have done better with this ;-) > network management > transferring files and other data > database lookups > > You get the picture. So Pricilla are you saying that there are more than 7 layers in the protocol stack? Mike Mandulak NCIA (not certified in anything ;-) Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=44688&t=44653 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
