Dear Team, This is Michalis from Athens, Greece. You have made a great work here. Your material is awesome and the big advantage is that you can find anything on line in html so you don't have to watch any videos (more easy to study at work). Also everything is so easy to understand. I'm in the preparation of the CCDE practical exam so your site is a good repository with all the fundamental technologies in one place. Unfortunately CCDE practical exam was canceled in March so I'm looking for ways to get even better performance for the exam in July. My suggestions in technologies are : *Wireless LAN *IoT *EVPN *Segment Routing *MPLS Traffic Engineering *MPLS InterAs *Unified MPLS *MPLS multicast VPNs *Multipoint LDP *BGP Hierarchical RRs *ACI *OTV Also maybe some design recommendations is some topics.For example I'm very confused with RR (ipv4/vpnv4) design best practises : *Should RR be in the same cluster or not? When should you configure the same cluster id on both RRs and when you should use different cluster id? *Should RRs (with the same cluster id or not) be directly connected? *Should RRs (with the same cluster id or not) have ipv4/vpnv4 ibgp session between them? I have a lot of other ideas but maybe I'm digressing now :) Thank you very much for your effort. Keep going with this guys! Michalis