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QUESTION (Answered on 11-06-2023)
Quick question: is IS-IS on the LAB after 4th of November? Somewhere I read on the Cisco site that ISO CLNS is removed from the LAB. It could be that I mix up things because I have absolutly no experience with IS-IS, so maybe ISO CLNS and IS-IS maybe different things. In the workbook LAB 4 has some IS-IS.
IS-IS is not removed from CCIE R/S lab blueprint. ISO CLNS may not be tested, but IS-IS with level-1, level-2 routers may be tested. I would advise you to study basic IS-IS routing configurations.